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Although BBS1 is known to be essential for proper BBSome function, the effects of disease-associated BBS1 variants on its activity remain incompletely understood.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>In this study, we examined how patient-derived BBS1 mutations affect BBSome integrity and its role in cargo transport within primary cilia.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Our results show that particular BBS1 mutations interfere with distinct stages of BBSome assembly and trafficking. While M390R disrupts initial pre-BBSome assembly at pericentriolar satellites, E224K impairs both the maturation of the pre-BBSome into the BBSome and its movement from pericentriolar satellites to the cilium. In contrast, the R160Q variant preserves BBSome assembly and permits its localization to cilia. It specifically weakens the BBSome-GPCR interaction mediated by TOM1L2, resulting in defective GPR161 export and increased ciliary IFT turnover.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Overall, our study establishes a mechanistic framework linking specific BBS1 mutations to distinct defects in BBSome assembly and function. This framework defines functional classes of BBS1 variants and provides deeper insight into the molecular mechanism and severity of Bardet-Biedl syndrome.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1186\/s12964-026-03006-8","type":"journal-article","created":{"date-parts":[[2026,6,19]],"date-time":"2026-06-19T01:51:54Z","timestamp":1781833914000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Bardet-Biedl syndrome 1 mutations differentially impact BBSome integrity and ciliary trafficking"],"prefix":"10.1186","volume":"24","author":[{"given":"Kristyna","family":"Maskova","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hana","family":"Hajsmanova","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sofiia","family":"Bykova","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sindija","family":"Smite","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Avishek","family":"Prasai","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daniel","family":"Rozbesky","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4403-1146","authenticated-orcid":false,"given":"Martina","family":"Huranova","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,6,19]]},"reference":[{"key":"3006_CR1","unstructured":"Forsyth R, Gunay-Aygun, M Bardet-Biedl Syndrome Overview. in GeneReviews\u00ae (eds Adam, M. 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