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    "path": "/journals/biology/micropub-biology-002380",
    "result": {"data":{"article":{"manuscript":{"id":"329fb06b-d1b0-4a66-b68d-20e8c3381a1f","submissionTypes":["new finding"],"citations":[],"doi":"10.17912/micropub.biology.002380","dbReferenceId":"WBPaper00070165","pmcId":"","pmId":"","proteopedia":"","reviewPanel":"","species":["c. elegans"],"integrations":[],"corrections":null,"history":{"received":"2026-08-27T07:38:41.443Z","revisionReceived":"2026-09-15T10:54:14.057Z","accepted":"2026-09-30T22:59:27.851Z","published":"2026-10-01T19:55:53.624Z","indexed":"2026-10-15T19:55:53.624Z"},"versions":[{"id":"64bf31f3-726d-4f82-b7c0-f40ac5470b21","decision":"revise","abstract":"<p>Previously, our lab used TurboID-based proximity labeling followed by mass spectrometry (MS) to identify proteins that interact with COSA-1, a cyclin-like pro-crossover factor that localizes at meiotic crossover sites. Here, we investigated potential interactions of COSA-1 with the top 10 COSA-1::TurboID-MS candidates ranked by relative intensity. Beyond the established COSA-1–CDK-2 interaction, AlphaFold 3 predicted strong binding solely between COSA-1 and GEI-14. Yeast two-hybrid assays confirmed this interaction and further revealed binding of GEI-14 to MSH-5, another pro-crossover factor. These results demonstrate TurboID's utility in studying the pro-crossover interactome and highlight GEI-14 as a promising candidate for further characterization.&nbsp;</p>","acknowledgements":"","authors":[{"affiliations":["Shandong University, Qingdao, Shandong, China"],"departments":[""],"credit":["investigation","formalAnalysis","visualization"],"email":"202323142024@mail.sdu.edu.cn","firstName":"Yuxin","lastName":"Xi","submittingAuthor":false,"correspondingAuthor":false,"equalContribution":false,"WBId":null,"orcid":null},{"affiliations":["Shandong University, Qingdao, Shandong, China"],"departments":[""],"credit":["validation"],"email":"1722171594@qq.com","firstName":"Yifei","lastName":"Zhao","submittingAuthor":false,"correspondingAuthor":false,"equalContribution":false,"WBId":null,"orcid":null},{"affiliations":["Shandong University, Qingdao, Shandong, China"],"departments":[""],"credit":["fundingAcquisition","methodology","writing_reviewEditing"],"email":"hongye@sdu.edu.cn","firstName":"Ye","lastName":"Hong","submittingAuthor":false,"correspondingAuthor":false,"equalContribution":false,"WBId":null,"orcid":null},{"affiliations":["Shandong University, Qingdao, Shandong, China"],"departments":[""],"credit":["conceptualization","supervision","methodology","writing_originalDraft","writing_reviewEditing","fundingAcquisition"],"email":"ht.zhang@sdu.edu.cn","firstName":"Hongtao","lastName":"Zhang","submittingAuthor":true,"correspondingAuthor":true,"equalContribution":false,"WBId":null,"orcid":"0009-0008-1836-7632"}],"awards":[],"conflictsOfInterest":"<p>The authors declare that there are no conflicts of interest present.</p>","dataTable":{"url":"https://portal.micropublication.org/uploads/2598a50226873ab4ea9c1160474ba52b.csv"},"extendedData":[],"funding":"<p>This work was supported by Natural Science Foundation of Shandong Province (Grant No. ZR2023QC174)  to YH, National Natural Science Foundation of China (Grant No. 32100662) and Future Plan for Young Scholars of Shandong University to HZ.</p>","image":{"url":"https://portal.micropublication.org/uploads/1ee6c934a404ba2ce1f578a586f4b3db.jpg"},"imageCaption":"<p>(A) Table listing the top 10 proximity-labeled proteins by <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"6795d8d4-218f-4734-9ef1-42deff3e6453\">COSA-1</a>::TurboID-MS. The ranking is based on their relative abundance (percentage of candidate protein intensity relative to the total protein intensity). (B) Bar graph showing the chain-pair ipTM scores for <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"b357ec95-d7dd-4c01-a53e-5f0bd19ecf67\">COSA-1</a> against each of the top 10 candidate proteins listed in (A). (C) Yeast two-hybrid assays showing interactions of <a href=\"http://www.wormbase.org/db/get?name=WBGene00001571;class=Gene\" id=\"0afe9502-c26e-441e-a20a-d35583dbada1\">GEI-14</a> with known pro-crossover factors. Positive combinations are highlighted in red. Table: Reagents.</p>","imageTitle":"<p>Identification of GEI-14 as a candidate pro-crossover protein by AlphaFold 3 and yeast two-hybrid assays</p>","methods":"<p>For yeast two-hybrid assays, full-length coding sequences for <a href=\"http://www.wormbase.org/db/get?name=WBGene00001571;class=Gene\" id=\"b1e0caf8-4302-4858-a024-bd06327e3d4c\">GEI-14</a> and known pro-crossover factors (<a href=\"http://www.wormbase.org/db/get?name=WBGene00019362;class=Gene\" id=\"137c0c54-2312-4ea5-82bf-1753c13f75a3\">CDK-2</a>, <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"d9b5de5e-bcde-49a8-b1e0-cab474b28424\">COSA-1</a>/COSA-1-6A, <a id=\"5c8b42c5-7a89-4137-9750-eb6466963cd3\">MSH-4</a>, <a href=\"http://www.wormbase.org/db/get?name=WBGene00003421;class=Gene\" id=\"668e25a2-652a-4168-b907-00bed10d0f3b\">MSH-5</a>, <a href=\"http://www.wormbase.org/db/get?name=WBGene00006976;class=Gene\" id=\"2fcd4659-2c99-4d51-938c-7ebd921956ce\">ZHP-3</a>) were cloned into plasmid pGADT7 or pGBKT7. Each bait and prey plasmid pair was co-transformed into yeast strain <a id=\"afd15b13-3045-4ffc-abf1-f0fe1452994f\">AH109</a>. The positive colonies were selected on a medium lacking tryptophan (-Trp) and leucine (-Leu) and were resuspended in 1 ml of 1× PBS. Serial dilutions of the suspension were plated on -His/-Trp/-Leu and -Trp/-Leu solid media, and the plates were incubated at 25°C for 3–4 days before the results were recorded.</p>","reagents":"<p></p>","patternDescription":"<p>Accurate segregation of homologous chromosomes into gametes depends on the establishment of interhomolog crossovers during the prophase of meiosis I (Arter and Keeney, 2024). Crossover formation arises from the repair of programmed DNA double-strand breaks (DSBs) via homologous recombination and is directly governed by a set of evolutionarily conserved pro-crossover factors (Gray and Cohen, 2016). These factors can stabilize recombination intermediates and promote their resolution into crossovers (Yokoo et al., 2012, Yang et al., 2024, Zhang et al., 2025).</p><p>Previously, we employed the TurboID proximity labeling approach to screen for novel interacting proteins of the pro-crossover factor <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"49873a59-33f5-479a-8a66-0539ff38c059\">COSA-1</a>, aiming to gain deeper insight into the mechanism of crossover formation (Yang et al., 2024; Liu et al., 2026). This approach enriched most known pro-crossover proteins, as well as those previously reported to concentrate at crossover-designated sites. It also led us to uncover a role for <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"09b80380-b9e5-4f9c-9b5c-779d1b256512\">COSA-1</a> in bridging crossover designation and Holliday junction resolution. In this follow-up study, we sought to validate potential interactions of <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"20358217-6e8b-494d-b525-10f5e5fa9a03\">COSA-1</a> with other proximity-labeled proteins identified by <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"f99790b1-3e2d-4aea-91fb-ea3f6041540d\">COSA-1</a>::TurboID-mass spectrometry. The top 10 candidates were selected based on their mass spectrometry-derived spectral intensities after streptavidin affinity purification (Figure 1A) (Liu et al., 2026). Among them were proteins with known functions in meiosis, such as <a href=\"http://www.wormbase.org/db/get?name=WBGene00019362;class=Gene\" id=\"73162ab9-0b5a-4a15-8d3c-08b4be0cb004\">CDK-2</a>, <a href=\"http://www.wormbase.org/db/get?name=WBGene00019712;class=Gene\" id=\"bc555a37-2853-45b0-ae0b-4ceac50aeace\">RMH-1</a>, and <a href=\"http://www.wormbase.org/db/get?name=WBGene00019002;class=Gene\" id=\"f2d53e19-a11c-495f-9ec0-06ed2bae3796\">SYP-6</a>. Of note, <a href=\"http://www.wormbase.org/db/get?name=WBGene00019362;class=Gene\" id=\"70c90873-80e5-4701-8103-c2e5a1a7a049\">CDK-2</a> is a well-established binding partner of <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"3642b053-286a-4995-9d18-bd0a86754fd2\">COSA-1</a> (Haversat et al., 2022, Zhang et al., 2025). As a first step, we used AlphaFold 3 to predict potential interactions between <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"1bee0150-939b-42e6-b865-7b096613c852\">COSA-1</a> and each candidate protein, and the resulting modeling revealed that the predicted <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"8270a97e-af3a-4993-8394-7e99ddd9c0a4\">COSA-1</a>–<a href=\"http://www.wormbase.org/db/get?name=WBGene00001571;class=Gene\" id=\"dbf2fe8a-f547-4475-953a-23c1d2ce5244\">GEI-14</a> complex yielded the highest ipTM score (~0.77) (Figure 1B), comparable to that of the <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"eb5b02de-6c70-4abe-bd0f-6412a29d986b\">COSA-1</a>–<a href=\"http://www.wormbase.org/db/get?name=WBGene00019362;class=Gene\" id=\"0c137573-ee0c-479e-a4d2-075e091ac88d\">CDK-2</a> complex (~0.74). This observation prompted us to test this interaction experimentally using yeast two-hybrid assays. Consistent with the prediction, yeast two-hybrid assays confirmed an interaction between <a href=\"http://www.wormbase.org/db/get?name=WBGene00001571;class=Gene\" id=\"1d6b8efb-4e61-4139-b5d6-bc33fbd49e36\">GEI-14</a> and <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"d4ca95f2-8619-49c1-8332-6e01d7b96c96\">COSA-1</a> (Figure 1C). To determine the specificity of this interaction, other pro-crossover factors were included as controls. No interaction was detected between <a href=\"http://www.wormbase.org/db/get?name=WBGene00001571;class=Gene\" id=\"44f79511-8f63-468c-a44e-e9304d84f449\">GEI-14</a> and <a href=\"http://www.wormbase.org/db/get?name=WBGene00019362;class=Gene\" id=\"54a672ba-a607-4715-a40a-583813e8f2df\">CDK-2</a>, <a href=\"http://www.wormbase.org/db/get?name=WBGene00001865;class=Gene\" id=\"081c1248-1a02-4600-97b3-d55daa49ddfe\">HIM-6</a>, or <a href=\"http://www.wormbase.org/db/get?name=WBGene00006976;class=Gene\" id=\"c92bc314-2bbb-4320-8752-9ee4e28b11e0\">ZHP-3</a>. However, <a href=\"http://www.wormbase.org/db/get?name=WBGene00003421;class=Gene\" id=\"e62e4da4-d1b0-4e04-aa49-60cd87370a69\">MSH-5</a> also showed interaction with <a href=\"http://www.wormbase.org/db/get?name=WBGene00001571;class=Gene\" id=\"9bfdb728-dd4e-45da-87d5-d43e72206716\">GEI-14</a>, albeit weaker than that with <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"997a0e1e-0588-4cfb-81c8-35d053bd7593\">COSA-1</a> (Figure 1C). The internal disordered region (IDR) in the N-terminus of <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"09c11ed6-fb68-4fe6-b13b-45dc262f99dc\">COSA-1</a> has been reported to be essential for its interaction with other pro-crossover factors (Yang et al., 2024). We therefore tested whether the interaction between <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"740ef6a7-d231-439b-bce2-91144e02055a\">COSA-1</a> and <a href=\"http://www.wormbase.org/db/get?name=WBGene00001571;class=Gene\" id=\"5e9965b7-035d-476a-8ddb-10b6d2b5b26e\">GEI-14</a> is also mediated through this region<a>. Although mutating six amino acids within the IDR of COSA-1(COSA-1-6A) was previously shown to abrogate its binding to MSH-5 or ZHP-3 </a>(Yang et al., 2024), the binding of COSA-1-6A to <a href=\"http://www.wormbase.org/db/get?name=WBGene00001571;class=Gene\" id=\"9bd6c888-fde6-4c7c-82b4-e4b2c6066a7a\">GEI-14</a> remained unaffected (Figure 1C), implying that the <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"0a580f2b-0230-43e7-a70e-3e55826c1286\">COSA-1</a>–<a href=\"http://www.wormbase.org/db/get?name=WBGene00001571;class=Gene\" id=\"4cc9d953-31bd-47ca-bc39-ed2b0ededb6c\">GEI-14</a> interaction involves a different region of <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"f5869d13-eb3f-4f2f-9874-8ba25b846e64\">COSA-1</a>. Notably, a recent study reported the discovery of <a href=\"http://www.wormbase.org/db/get?name=WBGene00001571;class=Gene\" id=\"c3d05c5e-7a84-49ef-afd0-799512f9ddfa\">GEI-14</a> as a novel pro-crossover protein through genetic screening (Uebel et al., 2026). That study also found that <a href=\"http://www.wormbase.org/db/get?name=WBGene00001571;class=Gene\" id=\"851b4702-8e5b-4f4c-aa54-4931631b59d3\">GEI-14</a> is required for crossover formation, localizes to crossover sites, and is in close proximity to <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"acc5f243-2a59-4f68-9077-1d94e500efde\">COSA-1</a> and accordingly named it <a id=\"6cc69a49-58c5-49ce-85ec-005c5854ad11\">COSA-2</a>.<a> Our yeast two-hybrid experiments further validated the physical association between these two proteins and also revealed interactions of COSA-2/GEI-14 with MSH-5. These data reinforce the proposed</a> role of <a id=\"ed614282-2a24-4e97-bd75-a600ee4e90b2\">COSA-2</a>/<a href=\"http://www.wormbase.org/db/get?name=WBGene00001571;class=Gene\" id=\"5fc7e4cb-c423-4981-b4df-69a8b4b2d065\">GEI-14</a> as a molecular glue that maintains the crossover fate of recombination intermediates (Uebel et al., 2026).</p>","references":[{"reference":"<p>Arter M, Keeney S. 2024. Divergence and conservation of the meiotic recombination machinery. Nat Rev Genet 25(5): 309-325.</p>","pubmedId":"38036793","doi":""},{"reference":"<p>Gray S, Cohen PE. 2016. Control of Meiotic Crossovers: From Double-Strand Break Formation to Designation. Annu Rev Genet 50: 175-210.</p>","pubmedId":"27648641","doi":""},{"reference":"<p>Haversat J, Woglar A, Klatt K, Akerib CC, Roberts V, Chen SY, et al., Kim. 2022. Robust designation of meiotic crossover sites by CDK-2 through phosphorylation of the MutSγ complex. Proceedings of the National Academy of Sciences 119: 10.1073/pnas.2117865119.</p>","pubmedId":"35576467","doi":"10.1073/pnas.2117865119"},{"reference":"<p>Liu G, Yang Y, Nan W, Xiao T, Guo Z, Zhang M, et al., Hong Y. 2026. COSA-1-SLX-4 interaction directly links crossover designation with Holliday junction resolution. Sci Adv 12(17): eadx9148.</p>","pubmedId":"42030394","doi":""},{"reference":"<p>Uebel CJ, Deng DY, Kim Y, Villeneuve AM. 2026. Disordered protein COSA-2 maintains crossover-specific repair compartments to ensure meiotic crossover maturation. bioRxiv: pii: 2026.05.13.725012. 10.64898/2026.05.13.725012.</p>","pubmedId":"42182264","doi":""},{"reference":"<p>Yang Y, Wang N, Liu G, Nan W, Wang B, Gartner A, Zhang H, Hong Y. 2024. COSA-1 mediated pro-crossover complex formation promotes meiotic crossing over in C. elegans. Nucleic Acids Res 52(8): 4375-4392.</p>","pubmedId":"38412290","doi":""},{"reference":"<p>Yokoo R, Zawadzki KA, Nabeshima K, Drake M, Arur S, Villeneuve AM. 2012. COSA-1 reveals robust homeostasis and separable licensing and reinforcement steps governing meiotic crossovers. Cell 149(1): 75-87.</p>","pubmedId":"22464324","doi":""},{"reference":"<p>Zhang L, Stauffer W, Liu C, Shao H, Abuzahriyeh N, Jiang R, et al., Dernburg AF. 2025. Crossover patterning through condensation and coarsening of pro-crossover factors. Nat Cell Biol 27(7): 1161-1174.</p>","pubmedId":"40537553","doi":""}],"title":"<p>Identification of GEI-14 as a candidate pro-crossover factor by TurboID in <i>C. elegans</i></p>","reviews":[{"reviewer":{"displayName":"Anne Villeneuve"},"openAcknowledgement":false,"status":{"submitted":true}}],"curatorReviews":[{"curator":{"displayName":"Jaehyoung Cho"},"openAcknowledgement":false,"submitted":null}]},{"id":"9817175b-1896-425d-b13c-f769c74a45b8","decision":"accept","abstract":"<p>Previously, our lab used TurboID-based proximity labeling followed by mass spectrometry (MS) to identify proteins that interact with <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"7b531fe3-d390-4a56-b402-bf11c4696593\">COSA-1</a>, a cyclin-like pro-crossover factor that localizes at meiotic crossover sites. Here, we investigated potential interactions of <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"36f11bce-f4e8-4d3f-a746-542952b3764d\">COSA-1</a> with the top 10 <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"7ac0ca62-fdf2-440d-bce9-557d26213383\">COSA-1</a>::TurboID-MS candidates ranked by relative intensity. Beyond the established <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"c44e68dd-c6a5-4a0b-8deb-713f13292df7\">COSA-1</a>–<a href=\"http://www.wormbase.org/db/get?name=WBGene00019362;class=Gene\" id=\"c8cbf123-2559-4b9b-83bc-9f5072265cb2\">CDK-2</a> interaction, AlphaFold 3 predicted strong binding solely between <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"002616ee-9dd4-41d7-86e1-33e906ae5093\">COSA-1</a> and <a href=\"http://www.wormbase.org/db/get?name=WBGene00001571;class=Gene\" id=\"03221b38-eb10-4f00-bbe2-f8f5179a3b36\">GEI-14</a>. Yeast two-hybrid assays confirmed this interaction and further revealed binding of <a href=\"http://www.wormbase.org/db/get?name=WBGene00001571;class=Gene\" id=\"e7c0c7e6-ff05-4dd6-84db-85d94643317c\">GEI-14</a> to <a href=\"http://www.wormbase.org/db/get?name=WBGene00003421;class=Gene\" id=\"a25f91da-5588-4b5e-8589-ba8b6e4b5e0d\">MSH-5</a>, another pro-crossover factor. These results demonstrate TurboID's utility in studying the pro-crossover interactome and highlight <a href=\"http://www.wormbase.org/db/get?name=WBGene00001571;class=Gene\" id=\"6f40364a-85e0-41cc-ac9a-0d69d7b268ae\">GEI-14</a> as a promising candidate for further characterization. </p>","acknowledgements":"","authors":[{"affiliations":["Shandong Provincial Key Laboratory of Development and Regeneration, School of Life Sciences, Shandong University, Qingdao, Shandong, China"],"departments":[""],"credit":["investigation","formalAnalysis","visualization"],"email":"202323142024@mail.sdu.edu.cn","firstName":"Yuxin","lastName":"Xi","submittingAuthor":false,"correspondingAuthor":false,"equalContribution":false,"WBId":null,"orcid":null},{"affiliations":["Shandong Provincial Key Laboratory of Development and Regeneration, School of Life Sciences, Shandong University, Qingdao, Shandong, China"],"departments":[""],"credit":["validation"],"email":"1722171594@qq.com","firstName":"Yifei","lastName":"Zhao","submittingAuthor":false,"correspondingAuthor":false,"equalContribution":false,"WBId":null,"orcid":null},{"affiliations":["Shandong Provincial Key Laboratory of Development and Regeneration, School of Life Sciences, Shandong University, Qingdao, Shandong, China"],"departments":[""],"credit":["fundingAcquisition","methodology","writing_reviewEditing"],"email":"hongye@sdu.edu.cn","firstName":"Ye","lastName":"Hong","submittingAuthor":false,"correspondingAuthor":false,"equalContribution":false,"WBId":null,"orcid":null},{"affiliations":["Shandong Provincial Key Laboratory of Development and Regeneration, School of Life Sciences, Shandong University, Qingdao, Shandong, China"],"departments":[""],"credit":["conceptualization","supervision","methodology","writing_originalDraft","writing_reviewEditing","fundingAcquisition"],"email":"ht.zhang@sdu.edu.cn","firstName":"Hongtao","lastName":"Zhang","submittingAuthor":true,"correspondingAuthor":true,"equalContribution":false,"WBId":null,"orcid":"0009-0008-1836-7632"}],"awards":[],"conflictsOfInterest":"<p>The authors declare that there are no conflicts of interest present.</p>","dataTable":{"url":"https://portal.micropublication.org/uploads/4ae680112e6518cf2f5875f91b823ece.csv"},"extendedData":[{"description":"<p>Table listing the top 10 proximity-labeled proteins by COSA-1::TurboID, including two known pro-crossover factors, alongside four additional bona fide pro-crossover factors captured in the same assay and their rank. The ranking is based on their relative abundance.</p>","doi":"10.22002/cxkmy-4cv26","resourceType":"Dataset","name":"supplemental table.xlsx","url":"https://portal.micropublication.org/uploads/eac9eba30c55a8e4110d91d290ab83fa.xlsx"}],"funding":"<p>This work was supported by Natural Science Foundation of Shandong Province (Grant No. ZR2023QC174)  to YH, National Natural Science Foundation of China (Grant No. 32100662) and Future Plan for Young Scholars of Shandong University to HZ.</p>","image":{"url":"https://portal.micropublication.org/uploads/75eccbc4d1cb74a73311f6bcc09a7460.jpg"},"imageCaption":"<p>(A) Table listing the top 10 proximity-labeled proteins by <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"b2f3b8b6-35d7-4d0a-801a-ea6b2ed32321\">COSA-1</a>::TurboID-MS. The ranking is based on their relative abundance (percentage of candidate protein intensity relative to the total protein intensity). The data are derived from Liu et al., 2026. For details, please check the supplemental table. All the listed proteins were uniquely identified by <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"1b649b09-28bc-4f29-b7a5-419d3a51e344\">COSA-1</a>::TurboID (not by the no-TurboID negative control). (B) Bar graph showing the chain-pair ipTM scores for <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"c6a4beac-4d03-4cff-a56a-a10d057e5a54\">COSA-1</a> against each of the top 10 candidate proteins listed in (A). (C) Yeast two-hybrid assays showing interactions of <a href=\"http://www.wormbase.org/db/get?name=WBGene00001571;class=Gene\" id=\"723e9260-c57b-4312-8692-d3447c4881fe\">GEI-14</a> with known pro-crossover factors. Positive combinations are highlighted in red. Table: Reagents.</p>","imageTitle":"<p>Identification of GEI-14 as a candidate pro-crossover protein by AlphaFold 3 and yeast two-hybrid assays</p>","methods":"<p>For yeast two-hybrid assays, full-length coding sequences for <a href=\"http://www.wormbase.org/db/get?name=WBGene00001571;class=Gene\" id=\"b1e0caf8-4302-4858-a024-bd06327e3d4c\">GEI-14</a> and known pro-crossover factors (<a href=\"http://www.wormbase.org/db/get?name=WBGene00019362;class=Gene\" id=\"137c0c54-2312-4ea5-82bf-1753c13f75a3\">CDK-2</a>, <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"d9b5de5e-bcde-49a8-b1e0-cab474b28424\">COSA-1</a>/COSA-1-6A, <a id=\"5c8b42c5-7a89-4137-9750-eb6466963cd3\">MSH-4</a>, <a href=\"http://www.wormbase.org/db/get?name=WBGene00003421;class=Gene\" id=\"668e25a2-652a-4168-b907-00bed10d0f3b\">MSH-5</a>, <a href=\"http://www.wormbase.org/db/get?name=WBGene00006976;class=Gene\" id=\"2fcd4659-2c99-4d51-938c-7ebd921956ce\">ZHP-3</a>) were cloned into plasmid pGADT7 (Takara Bio, 630442) or pGBKT7 (Takara Bio, 630443). Each bait and prey plasmid pair was co-transformed into yeast strain <a id=\"afd15b13-3045-4ffc-abf1-f0fe1452994f\">AH109</a> (Coolaber, <a id=\"ae3e5e22-ae9a-49ce-bdb8-d8f487c59027\">CC300</a>). The positive colonies were selected on a medium lacking tryptophan (-Trp) and leucine (-Leu) and were resuspended in 1 ml of 1× PBS. Serial dilutions of the suspension were plated on -His/-Trp/-Leu and -Trp/-Leu solid media, and the plates were incubated at 25°C for 3–4 days before the results were recorded.</p>","reagents":"<p></p>","patternDescription":"<p>Accurate segregation of homologous chromosomes into gametes depends on the establishment of interhomolog crossovers during the prophase of meiosis I (Arter and Keeney, 2024). Crossover formation arises from the repair of programmed DNA double-strand breaks (DSBs) via homologous recombination and is directly governed by a set of evolutionarily conserved pro-crossover factors (Gray and Cohen, 2016). These factors can stabilize recombination intermediates and promote their resolution into crossovers (Hollingsworth et al., 1995, Yokoo et al., 2012, Yang et al., 2024, Zhang et al., 2025).</p><p>Previously, we employed the TurboID proximity labeling approach to screen for novel interacting proteins of the pro-crossover factor <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"49873a59-33f5-479a-8a66-0539ff38c059\">COSA-1</a>, aiming to gain deeper insight into the mechanism of crossover formation (Yang et al., 2024; Liu et al., 2026). This approach enriched most known pro-crossover proteins, as well as those previously reported to concentrate at crossover-designated sites. It also led us to uncover a role for <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"09b80380-b9e5-4f9c-9b5c-779d1b256512\">COSA-1</a> in bridging crossover designation and Holliday junction resolution. In this follow-up study, we sought to validate potential interactions of <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"20358217-6e8b-494d-b525-10f5e5fa9a03\">COSA-1</a> with other proximity-labeled proteins identified by <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"f99790b1-3e2d-4aea-91fb-ea3f6041540d\">COSA-1</a>::TurboID-mass spectrometry. The top 10 candidates were selected based on their mass spectrometry-derived spectral intensities after streptavidin affinity purification (Figure 1A) (Liu et al., 2026). Among them were proteins with known functions in meiosis, such as <a href=\"http://www.wormbase.org/db/get?name=WBGene00019362;class=Gene\" id=\"73162ab9-0b5a-4a15-8d3c-08b4be0cb004\">CDK-2</a>, <a href=\"http://www.wormbase.org/db/get?name=WBGene00019712;class=Gene\" id=\"bc555a37-2853-45b0-ae0b-4ceac50aeace\">RMH-1</a>, and <a href=\"http://www.wormbase.org/db/get?name=WBGene00019002;class=Gene\" id=\"f2d53e19-a11c-495f-9ec0-06ed2bae3796\">SYP-6</a>. Of note, <a href=\"http://www.wormbase.org/db/get?name=WBGene00019362;class=Gene\" id=\"70c90873-80e5-4701-8103-c2e5a1a7a049\">CDK-2</a> is a well-established binding partner of <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"3642b053-286a-4995-9d18-bd0a86754fd2\">COSA-1</a> (Haversat et al., 2022, Zhang et al., 2025). As a first step, we used AlphaFold 3 to predict potential interactions between <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"1bee0150-939b-42e6-b865-7b096613c852\">COSA-1</a> and each candidate protein (Abramson et al., 2024), and the resulting modeling revealed that the predicted <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"8270a97e-af3a-4993-8394-7e99ddd9c0a4\">COSA-1</a>–<a href=\"http://www.wormbase.org/db/get?name=WBGene00001571;class=Gene\" id=\"dbf2fe8a-f547-4475-953a-23c1d2ce5244\">GEI-14</a> complex yielded the highest ipTM score (~0.77) (Figure 1B), comparable to that of the <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"eb5b02de-6c70-4abe-bd0f-6412a29d986b\">COSA-1</a>–<a href=\"http://www.wormbase.org/db/get?name=WBGene00019362;class=Gene\" id=\"0c137573-ee0c-479e-a4d2-075e091ac88d\">CDK-2</a> complex (~0.74). This observation prompted us to test this interaction experimentally using yeast two-hybrid assays. Consistent with the prediction, yeast two-hybrid assays confirmed an interaction between <a href=\"http://www.wormbase.org/db/get?name=WBGene00001571;class=Gene\" id=\"1d6b8efb-4e61-4139-b5d6-bc33fbd49e36\">GEI-14</a> and <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"d4ca95f2-8619-49c1-8332-6e01d7b96c96\">COSA-1</a> (Figure 1C). To determine the specificity of this interaction, other pro-crossover factors were included as controls. No interaction was detected between <a href=\"http://www.wormbase.org/db/get?name=WBGene00001571;class=Gene\" id=\"44f79511-8f63-468c-a44e-e9304d84f449\">GEI-14</a> and <a href=\"http://www.wormbase.org/db/get?name=WBGene00019362;class=Gene\" id=\"54a672ba-a607-4715-a40a-583813e8f2df\">CDK-2</a>, <a href=\"http://www.wormbase.org/db/get?name=WBGene00001865;class=Gene\" id=\"081c1248-1a02-4600-97b3-d55daa49ddfe\">HIM-6</a>, or <a href=\"http://www.wormbase.org/db/get?name=WBGene00006976;class=Gene\" id=\"c92bc314-2bbb-4320-8752-9ee4e28b11e0\">ZHP-3</a>. However, <a href=\"http://www.wormbase.org/db/get?name=WBGene00003421;class=Gene\" id=\"e62e4da4-d1b0-4e04-aa49-60cd87370a69\">MSH-5</a> also showed interaction with <a href=\"http://www.wormbase.org/db/get?name=WBGene00001571;class=Gene\" id=\"9bfdb728-dd4e-45da-87d5-d43e72206716\">GEI-14</a>, albeit weaker than that with <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"997a0e1e-0588-4cfb-81c8-35d053bd7593\">COSA-1</a> (Figure 1C). The internal disordered region (IDR) in the N-terminus of <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"09c11ed6-fb68-4fe6-b13b-45dc262f99dc\">COSA-1</a> has been reported to be essential for its interaction with other pro-crossover factors (Yang et al., 2024). We therefore tested whether the interaction between <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"740ef6a7-d231-439b-bce2-91144e02055a\">COSA-1</a> and <a href=\"http://www.wormbase.org/db/get?name=WBGene00001571;class=Gene\" id=\"5e9965b7-035d-476a-8ddb-10b6d2b5b26e\">GEI-14</a> is also mediated through this region<a>. Although mutating six amino acids within the IDR of COSA-1(COSA-1-6A) was previously shown to abrogate its binding to MSH-5 or ZHP-3 </a>(Yang et al., 2024), the binding of COSA-1-6A to <a href=\"http://www.wormbase.org/db/get?name=WBGene00001571;class=Gene\" id=\"9bd6c888-fde6-4c7c-82b4-e4b2c6066a7a\">GEI-14</a> remained unaffected (Figure 1C), implying that the <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"0a580f2b-0230-43e7-a70e-3e55826c1286\">COSA-1</a>–<a href=\"http://www.wormbase.org/db/get?name=WBGene00001571;class=Gene\" id=\"4cc9d953-31bd-47ca-bc39-ed2b0ededb6c\">GEI-14</a> interaction involves a different region of <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"f5869d13-eb3f-4f2f-9874-8ba25b846e64\">COSA-1</a>. Notably, a recent study reported the discovery of <a href=\"http://www.wormbase.org/db/get?name=WBGene00001571;class=Gene\" id=\"c3d05c5e-7a84-49ef-afd0-799512f9ddfa\">GEI-14</a> as a novel pro-crossover protein through genetic screening (Uebel et al., 2026). That study also found that <a href=\"http://www.wormbase.org/db/get?name=WBGene00001571;class=Gene\" id=\"851b4702-8e5b-4f4c-aa54-4931631b59d3\">GEI-14</a> is required for crossover formation, localizes to crossover sites, and is in close proximity to <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"acc5f243-2a59-4f68-9077-1d94e500efde\">COSA-1</a> and accordingly named it <a id=\"6cc69a49-58c5-49ce-85ec-005c5854ad11\">COSA-2</a>.<a> Our yeast two-hybrid experiments further validated the physical association between these two proteins and also revealed interactions of COSA-2/GEI-14 with MSH-5. These data reinforce the proposed</a> role of <a id=\"ed614282-2a24-4e97-bd75-a600ee4e90b2\">COSA-2</a>/<a href=\"http://www.wormbase.org/db/get?name=WBGene00001571;class=Gene\" id=\"5fc7e4cb-c423-4981-b4df-69a8b4b2d065\">GEI-14</a> as a molecular glue that maintains the crossover fate of recombination intermediates (Uebel et al., 2026).</p>","references":[{"reference":"<p>Arter M, Keeney S. 2024. Divergence and conservation of the meiotic recombination machinery. Nat Rev Genet 25(5): 309-325.</p>","pubmedId":"38036793","doi":""},{"reference":"<p>Gray S, Cohen PE. 2016. Control of Meiotic Crossovers: From Double-Strand Break Formation to Designation. Annu Rev Genet 50: 175-210.</p>","pubmedId":"27648641","doi":""},{"reference":"<p>Haversat J, Woglar A, Klatt K, Akerib CC, Roberts V, Chen SY, et al., Kim. 2022. Robust designation of meiotic crossover sites by CDK-2 through phosphorylation of the MutSγ complex. Proceedings of the National Academy of Sciences 119: 10.1073/pnas.2117865119.</p>","pubmedId":"35576467","doi":"10.1073/pnas.2117865119"},{"reference":"<p>Hollingsworth NM, Ponte L, Halsey C. 1995. MSH5, a novel MutS homolog, facilitates meiotic reciprocal recombination between homologs in Saccharomyces cerevisiae but not mismatch repair. Genes Dev 9(14): 1728-39.</p>","pubmedId":"7622037","doi":""},{"reference":"<p>Liu G, Yang Y, Nan W, Xiao T, Guo Z, Zhang M, et al., Hong Y. 2026. COSA-1-SLX-4 interaction directly links crossover designation with Holliday junction resolution. Sci Adv 12(17): eadx9148.</p>","pubmedId":"42030394","doi":""},{"reference":"<p>Uebel CJ, Deng DY, Kim Y, Villeneuve AM. 2026. Disordered protein COSA-2 maintains crossover-specific repair compartments to ensure meiotic crossover maturation. bioRxiv: pii: 2026.05.13.725012. 10.64898/2026.05.13.725012.</p>","pubmedId":"42182264","doi":""},{"reference":"<p>Yang Y, Wang N, Liu G, Nan W, Wang B, Gartner A, Zhang H, Hong Y. 2024. COSA-1 mediated pro-crossover complex formation promotes meiotic crossing over in C. elegans. Nucleic Acids Res 52(8): 4375-4392.</p>","pubmedId":"38412290","doi":""},{"reference":"<p>Yokoo R, Zawadzki KA, Nabeshima K, Drake M, Arur S, Villeneuve AM. 2012. COSA-1 reveals robust homeostasis and separable licensing and reinforcement steps governing meiotic crossovers. Cell 149(1): 75-87.</p>","pubmedId":"22464324","doi":""},{"reference":"<p>Zhang L, Stauffer W, Liu C, Shao H, Abuzahriyeh N, Jiang R, et al., Dernburg AF. 2025. Crossover patterning through condensation and coarsening of pro-crossover factors. Nat Cell Biol 27(7): 1161-1174.</p>","pubmedId":"40537553","doi":""}],"title":"<p>Identification of GEI-14 as a candidate pro-crossover factor by TurboID in <i>C. elegans</i></p>","reviews":[],"curatorReviews":[{"curator":{"displayName":"Jaehyoung Cho"},"openAcknowledgement":false,"submitted":null}]},{"id":"82aea479-88e1-4d2d-951f-dd043370f315","decision":"publish","abstract":"<p>Previously, our lab used TurboID-based proximity labeling followed by mass spectrometry (MS) to identify proteins that interact with <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"7b531fe3-d390-4a56-b402-bf11c4696593\">COSA-1</a>, a cyclin-like pro-crossover factor that localizes at meiotic crossover sites. Here, we investigated potential interactions of <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"36f11bce-f4e8-4d3f-a746-542952b3764d\">COSA-1</a> with the top 10 <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"7ac0ca62-fdf2-440d-bce9-557d26213383\">COSA-1</a>::TurboID-MS candidates ranked by relative intensity. Beyond the established <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"c44e68dd-c6a5-4a0b-8deb-713f13292df7\">COSA-1</a>–<a href=\"http://www.wormbase.org/db/get?name=WBGene00019362;class=Gene\" id=\"c8cbf123-2559-4b9b-83bc-9f5072265cb2\">CDK-2</a> interaction, AlphaFold 3 predicted strong binding solely between <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"002616ee-9dd4-41d7-86e1-33e906ae5093\">COSA-1</a> and <a href=\"http://www.wormbase.org/db/get?name=WBGene00001571;class=Gene\" id=\"03221b38-eb10-4f00-bbe2-f8f5179a3b36\">GEI-14</a>. Yeast two-hybrid assays confirmed this interaction and further revealed binding of <a href=\"http://www.wormbase.org/db/get?name=WBGene00001571;class=Gene\" id=\"e7c0c7e6-ff05-4dd6-84db-85d94643317c\">GEI-14</a> to <a href=\"http://www.wormbase.org/db/get?name=WBGene00003421;class=Gene\" id=\"a25f91da-5588-4b5e-8589-ba8b6e4b5e0d\">MSH-5</a>, another pro-crossover factor. These results demonstrate TurboID's utility in studying the pro-crossover interactome and highlight <a href=\"http://www.wormbase.org/db/get?name=WBGene00001571;class=Gene\" id=\"6f40364a-85e0-41cc-ac9a-0d69d7b268ae\">GEI-14</a> as a promising candidate for further characterization. </p>","acknowledgements":"","authors":[{"affiliations":["Shandong Provincial Key Laboratory of Development and Regeneration, School of Life Sciences, Shandong University, Qingdao, Shandong, China"],"departments":[""],"credit":["investigation","formalAnalysis","visualization"],"email":"202323142024@mail.sdu.edu.cn","firstName":"Yuxin","lastName":"Xi","submittingAuthor":false,"correspondingAuthor":false,"equalContribution":false,"WBId":null,"orcid":null},{"affiliations":["Shandong Provincial Key Laboratory of Development and Regeneration, School of Life Sciences, Shandong University, Qingdao, Shandong, China"],"departments":[""],"credit":["validation"],"email":"1722171594@qq.com","firstName":"Yifei","lastName":"Zhao","submittingAuthor":false,"correspondingAuthor":false,"equalContribution":false,"WBId":null,"orcid":null},{"affiliations":["Shandong Provincial Key Laboratory of Development and Regeneration, School of Life Sciences, Shandong University, Qingdao, Shandong, China"],"departments":[""],"credit":["fundingAcquisition","methodology","writing_reviewEditing"],"email":"hongye@sdu.edu.cn","firstName":"Ye","lastName":"Hong","submittingAuthor":false,"correspondingAuthor":false,"equalContribution":false,"WBId":null,"orcid":null},{"affiliations":["Shandong Provincial Key Laboratory of Development and Regeneration, School of Life Sciences, Shandong University, Qingdao, Shandong, China"],"departments":[""],"credit":["conceptualization","supervision","methodology","writing_originalDraft","writing_reviewEditing","fundingAcquisition"],"email":"ht.zhang@sdu.edu.cn","firstName":"Hongtao","lastName":"Zhang","submittingAuthor":true,"correspondingAuthor":true,"equalContribution":false,"WBId":null,"orcid":"0009-0008-1836-7632"}],"awards":[],"conflictsOfInterest":"<p>The authors declare that there are no conflicts of interest present.</p>","dataTable":{"url":"https://portal.micropublication.org/uploads/4ae680112e6518cf2f5875f91b823ece.csv"},"extendedData":[{"description":"<p>Table listing the top 10 proximity-labeled proteins by COSA-1::TurboID, including two known pro-crossover factors, alongside four additional bona fide pro-crossover factors captured in the same assay and their rank. The ranking is based on their relative abundance.</p>","doi":"10.22002/cxkmy-4cv26","resourceType":"Dataset","name":"supplemental table.xlsx","url":"https://portal.micropublication.org/uploads/eac9eba30c55a8e4110d91d290ab83fa.xlsx"}],"funding":"<p>This work was supported by Natural Science Foundation of Shandong Province (Grant No. ZR2023QC174)  to YH, National Natural Science Foundation of China (Grant No. 32100662) and Future Plan for Young Scholars of Shandong University to HZ.</p>","image":{"url":"https://portal.micropublication.org/uploads/75eccbc4d1cb74a73311f6bcc09a7460.jpg"},"imageCaption":"<p>(A) Table listing the top 10 proximity-labeled proteins by <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"b2f3b8b6-35d7-4d0a-801a-ea6b2ed32321\">COSA-1</a>::TurboID-MS. The ranking is based on their relative abundance (percentage of candidate protein intensity relative to the total protein intensity). The data are derived from Liu et al., 2026. For details, please check the supplemental table. All the listed proteins were uniquely identified by <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"1b649b09-28bc-4f29-b7a5-419d3a51e344\">COSA-1</a>::TurboID (not by the no-TurboID negative control). (B) Bar graph showing the chain-pair ipTM scores for <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"c6a4beac-4d03-4cff-a56a-a10d057e5a54\">COSA-1</a> against each of the top 10 candidate proteins listed in (A). (C) Yeast two-hybrid assays showing interactions of <a href=\"http://www.wormbase.org/db/get?name=WBGene00001571;class=Gene\" id=\"723e9260-c57b-4312-8692-d3447c4881fe\">GEI-14</a> with known pro-crossover factors. Positive combinations are highlighted in red. Table: Reagents.</p>","imageTitle":"<p>Identification of GEI-14 as a candidate pro-crossover protein by AlphaFold 3 and yeast two-hybrid assays</p>","methods":"<p>For yeast two-hybrid assays, full-length coding sequences for <a href=\"http://www.wormbase.org/db/get?name=WBGene00001571;class=Gene\" id=\"b1e0caf8-4302-4858-a024-bd06327e3d4c\">GEI-14</a> and known pro-crossover factors (<a href=\"http://www.wormbase.org/db/get?name=WBGene00019362;class=Gene\" id=\"137c0c54-2312-4ea5-82bf-1753c13f75a3\">CDK-2</a>, <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"d9b5de5e-bcde-49a8-b1e0-cab474b28424\">COSA-1</a>/COSA-1-6A, <a id=\"5c8b42c5-7a89-4137-9750-eb6466963cd3\">MSH-4</a>, <a href=\"http://www.wormbase.org/db/get?name=WBGene00003421;class=Gene\" id=\"668e25a2-652a-4168-b907-00bed10d0f3b\">MSH-5</a>, <a href=\"http://www.wormbase.org/db/get?name=WBGene00006976;class=Gene\" id=\"2fcd4659-2c99-4d51-938c-7ebd921956ce\">ZHP-3</a>) were cloned into plasmid pGADT7 (Takara Bio, 630442) or pGBKT7 (Takara Bio, 630443). Each bait and prey plasmid pair was co-transformed into yeast strain <a id=\"afd15b13-3045-4ffc-abf1-f0fe1452994f\">AH109</a> (Coolaber, <a id=\"ae3e5e22-ae9a-49ce-bdb8-d8f487c59027\">CC300</a>). The positive colonies were selected on a medium lacking tryptophan (-Trp) and leucine (-Leu) and were resuspended in 1 ml of 1× PBS. Serial dilutions of the suspension were plated on -His/-Trp/-Leu and -Trp/-Leu solid media, and the plates were incubated at 25°C for 3–4 days before the results were recorded.</p>","reagents":"<p></p>","patternDescription":"<p>Accurate segregation of homologous chromosomes into gametes depends on the establishment of interhomolog crossovers during the prophase of meiosis I (Arter and Keeney, 2024). Crossover formation arises from the repair of programmed DNA double-strand breaks (DSBs) via homologous recombination and is directly governed by a set of evolutionarily conserved pro-crossover factors (Gray and Cohen, 2016). These factors can stabilize recombination intermediates and promote their resolution into crossovers (Hollingsworth et al., 1995, Yokoo et al., 2012, Yang et al., 2024, Zhang et al., 2025).</p><p>Previously, we employed the TurboID proximity labeling approach to screen for novel interacting proteins of the pro-crossover factor <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"49873a59-33f5-479a-8a66-0539ff38c059\">COSA-1</a>, aiming to gain deeper insight into the mechanism of crossover formation (Yang et al., 2024; Liu et al., 2026). This approach enriched most known pro-crossover proteins, as well as those previously reported to concentrate at crossover-designated sites. It also led us to uncover a role for <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"09b80380-b9e5-4f9c-9b5c-779d1b256512\">COSA-1</a> in bridging crossover designation and Holliday junction resolution. In this follow-up study, we sought to validate potential interactions of <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"20358217-6e8b-494d-b525-10f5e5fa9a03\">COSA-1</a> with other proximity-labeled proteins identified by <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"f99790b1-3e2d-4aea-91fb-ea3f6041540d\">COSA-1</a>::TurboID-mass spectrometry. The top 10 candidates were selected based on their mass spectrometry-derived spectral intensities after streptavidin affinity purification (Figure 1A) (Liu et al., 2026). Among them were proteins with known functions in meiosis, such as <a href=\"http://www.wormbase.org/db/get?name=WBGene00019362;class=Gene\" id=\"73162ab9-0b5a-4a15-8d3c-08b4be0cb004\">CDK-2</a>, <a href=\"http://www.wormbase.org/db/get?name=WBGene00019712;class=Gene\" id=\"bc555a37-2853-45b0-ae0b-4ceac50aeace\">RMH-1</a>, and <a href=\"http://www.wormbase.org/db/get?name=WBGene00019002;class=Gene\" id=\"f2d53e19-a11c-495f-9ec0-06ed2bae3796\">SYP-6</a>. Of note, <a href=\"http://www.wormbase.org/db/get?name=WBGene00019362;class=Gene\" id=\"70c90873-80e5-4701-8103-c2e5a1a7a049\">CDK-2</a> is a well-established binding partner of <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"3642b053-286a-4995-9d18-bd0a86754fd2\">COSA-1</a> (Haversat et al., 2022, Zhang et al., 2025). As a first step, we used AlphaFold 3 to predict potential interactions between <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"1bee0150-939b-42e6-b865-7b096613c852\">COSA-1</a> and each candidate protein (Abramson et al., 2024), and the resulting modeling revealed that the predicted <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"8270a97e-af3a-4993-8394-7e99ddd9c0a4\">COSA-1</a>–<a href=\"http://www.wormbase.org/db/get?name=WBGene00001571;class=Gene\" id=\"dbf2fe8a-f547-4475-953a-23c1d2ce5244\">GEI-14</a> complex yielded the highest ipTM score (~0.77) (Figure 1B), comparable to that of the <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"eb5b02de-6c70-4abe-bd0f-6412a29d986b\">COSA-1</a>–<a href=\"http://www.wormbase.org/db/get?name=WBGene00019362;class=Gene\" id=\"0c137573-ee0c-479e-a4d2-075e091ac88d\">CDK-2</a> complex (~0.74). This observation prompted us to test this interaction experimentally using yeast two-hybrid assays. Consistent with the prediction, yeast two-hybrid assays confirmed an interaction between <a href=\"http://www.wormbase.org/db/get?name=WBGene00001571;class=Gene\" id=\"1d6b8efb-4e61-4139-b5d6-bc33fbd49e36\">GEI-14</a> and <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"d4ca95f2-8619-49c1-8332-6e01d7b96c96\">COSA-1</a> (Figure 1C). To determine the specificity of this interaction, other pro-crossover factors were included as controls. No interaction was detected between <a href=\"http://www.wormbase.org/db/get?name=WBGene00001571;class=Gene\" id=\"44f79511-8f63-468c-a44e-e9304d84f449\">GEI-14</a> and <a href=\"http://www.wormbase.org/db/get?name=WBGene00019362;class=Gene\" id=\"54a672ba-a607-4715-a40a-583813e8f2df\">CDK-2</a>, <a href=\"http://www.wormbase.org/db/get?name=WBGene00001865;class=Gene\" id=\"081c1248-1a02-4600-97b3-d55daa49ddfe\">HIM-6</a>, or <a href=\"http://www.wormbase.org/db/get?name=WBGene00006976;class=Gene\" id=\"c92bc314-2bbb-4320-8752-9ee4e28b11e0\">ZHP-3</a>. However, <a href=\"http://www.wormbase.org/db/get?name=WBGene00003421;class=Gene\" id=\"e62e4da4-d1b0-4e04-aa49-60cd87370a69\">MSH-5</a> also showed interaction with <a href=\"http://www.wormbase.org/db/get?name=WBGene00001571;class=Gene\" id=\"9bfdb728-dd4e-45da-87d5-d43e72206716\">GEI-14</a>, albeit weaker than that with <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"997a0e1e-0588-4cfb-81c8-35d053bd7593\">COSA-1</a> (Figure 1C). The internal disordered region (IDR) in the N-terminus of <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"09c11ed6-fb68-4fe6-b13b-45dc262f99dc\">COSA-1</a> has been reported to be essential for its interaction with other pro-crossover factors (Yang et al., 2024). We therefore tested whether the interaction between <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"740ef6a7-d231-439b-bce2-91144e02055a\">COSA-1</a> and <a href=\"http://www.wormbase.org/db/get?name=WBGene00001571;class=Gene\" id=\"5e9965b7-035d-476a-8ddb-10b6d2b5b26e\">GEI-14</a> is also mediated through this region<a>. Although mutating six amino acids within the IDR of COSA-1(COSA-1-6A) was previously shown to abrogate its binding to MSH-5 or ZHP-3 </a>(Yang et al., 2024), the binding of COSA-1-6A to <a href=\"http://www.wormbase.org/db/get?name=WBGene00001571;class=Gene\" id=\"9bd6c888-fde6-4c7c-82b4-e4b2c6066a7a\">GEI-14</a> remained unaffected (Figure 1C), implying that the <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"0a580f2b-0230-43e7-a70e-3e55826c1286\">COSA-1</a>–<a href=\"http://www.wormbase.org/db/get?name=WBGene00001571;class=Gene\" id=\"4cc9d953-31bd-47ca-bc39-ed2b0ededb6c\">GEI-14</a> interaction involves a different region of <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"f5869d13-eb3f-4f2f-9874-8ba25b846e64\">COSA-1</a>. Notably, a recent study reported the discovery of <a href=\"http://www.wormbase.org/db/get?name=WBGene00001571;class=Gene\" id=\"c3d05c5e-7a84-49ef-afd0-799512f9ddfa\">GEI-14</a> as a novel pro-crossover protein through genetic screening (Uebel et al., 2026). That study also found that <a href=\"http://www.wormbase.org/db/get?name=WBGene00001571;class=Gene\" id=\"851b4702-8e5b-4f4c-aa54-4931631b59d3\">GEI-14</a> is required for crossover formation, localizes to crossover sites, and is in close proximity to <a href=\"http://www.wormbase.org/db/get?name=WBGene00022172;class=Gene\" id=\"acc5f243-2a59-4f68-9077-1d94e500efde\">COSA-1</a> and accordingly named it <a id=\"6cc69a49-58c5-49ce-85ec-005c5854ad11\">COSA-2</a>.<a> Our yeast two-hybrid experiments further validated the physical association between these two proteins and also revealed interactions of COSA-2/GEI-14 with MSH-5. These data reinforce the proposed</a> role of <a id=\"ed614282-2a24-4e97-bd75-a600ee4e90b2\">COSA-2</a>/<a href=\"http://www.wormbase.org/db/get?name=WBGene00001571;class=Gene\" id=\"5fc7e4cb-c423-4981-b4df-69a8b4b2d065\">GEI-14</a> as a molecular glue that maintains the crossover fate of recombination intermediates (Uebel et al., 2026).</p>","references":[{"reference":"<p>Abramson J, Adler J, Dunger J, Evans R, Green T, Pritzel A, et al., Jumper JM. 2024. Accurate structure prediction of biomolecular interactions with AlphaFold 3. Nature 630(8016): 493-500.</p>","pubmedId":"38718835","doi":""},{"reference":"<p>Arter M, Keeney S. 2024. Divergence and conservation of the meiotic recombination machinery. Nat Rev Genet 25(5): 309-325.</p>","pubmedId":"38036793","doi":""},{"reference":"<p>Gray S, Cohen PE. 2016. Control of Meiotic Crossovers: From Double-Strand Break Formation to Designation. Annu Rev Genet 50: 175-210.</p>","pubmedId":"27648641","doi":""},{"reference":"<p>Haversat J, Woglar A, Klatt K, Akerib CC, Roberts V, Chen SY, et al., Kim. 2022. Robust designation of meiotic crossover sites by CDK-2 through phosphorylation of the MutSγ complex. Proceedings of the National Academy of Sciences 119: 10.1073/pnas.2117865119.</p>","pubmedId":"35576467","doi":"10.1073/pnas.2117865119"},{"reference":"<p>Hollingsworth NM, Ponte L, Halsey C. 1995. MSH5, a novel MutS homolog, facilitates meiotic reciprocal recombination between homologs in Saccharomyces cerevisiae but not mismatch repair. Genes Dev 9(14): 1728-39.</p>","pubmedId":"7622037","doi":""},{"reference":"<p>Liu G, Yang Y, Nan W, Xiao T, Guo Z, Zhang M, et al., Hong Y. 2026. COSA-1-SLX-4 interaction directly links crossover designation with Holliday junction resolution. Sci Adv 12(17): eadx9148.</p>","pubmedId":"42030394","doi":""},{"reference":"<p>Uebel CJ, Deng DY, Kim Y, Villeneuve AM. 2026. Disordered protein COSA-2 maintains crossover-specific repair compartments to ensure meiotic crossover maturation. bioRxiv: pii: 2026.05.13.725012. 10.64898/2026.05.13.725012.</p>","pubmedId":"42182264","doi":""},{"reference":"<p>Yang Y, Wang N, Liu G, Nan W, Wang B, Gartner A, Zhang H, Hong Y. 2024. COSA-1 mediated pro-crossover complex formation promotes meiotic crossing over in C. elegans. Nucleic Acids Res 52(8): 4375-4392.</p>","pubmedId":"38412290","doi":""},{"reference":"<p>Yokoo R, Zawadzki KA, Nabeshima K, Drake M, Arur S, Villeneuve AM. 2012. COSA-1 reveals robust homeostasis and separable licensing and reinforcement steps governing meiotic crossovers. Cell 149(1): 75-87.</p>","pubmedId":"22464324","doi":""},{"reference":"<p>Zhang L, Stauffer W, Liu C, Shao H, Abuzahriyeh N, Jiang R, et al., Dernburg AF. 2025. Crossover patterning through condensation and coarsening of pro-crossover factors. Nat Cell Biol 27(7): 1161-1174.</p>","pubmedId":"40537553","doi":""}],"title":"<p>Identification of GEI-14 as a candidate pro-crossover factor by TurboID in <i>C. elegans</i></p>","reviews":[],"curatorReviews":[{"curator":{"displayName":"Jaehyoung Cho"},"openAcknowledgement":false,"submitted":null}]}]}},"species":{"species":[{"value":"acer saccharum","label":"Acer saccharum","imageSrc":"","imageAlt":"","mod":"TreeGenes","modLink":"https://treegenesdb.org","linkVariable":""},{"value":"achillea millefolium","label":"Achillea millefolium","imageSrc":"","imageAlt":"","mod":"","modLink":"","linkVariable":""},{"value":"acinetobacter baylyi","label":"Acinetobacter baylyi","imageSrc":"","imageAlt":"","mod":"","modLink":"","linkVariable":""},{"value":"actinobacteria bacterium","label":"Actinobacteria bacterium","imageSrc":"","imageAlt":"","mod":"","modLink":"","linkVariable":""},{"value":"adelges tsugae","label":"Adelges 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