{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,31]],"date-time":"2026-07-31T15:12:04Z","timestamp":1785510724391,"version":"3.56.0"},"reference-count":94,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2021,5,21]],"date-time":"2021-05-21T00:00:00Z","timestamp":1621555200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001711","name":"Schweizerischer Nationalfonds zur F\u00f6rderung der Wissenschaftlichen Forschung","doi-asserted-by":"publisher","award":["31003A-173183"],"award-info":[{"award-number":["31003A-173183"]}],"id":[{"id":"10.13039\/501100001711","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100005688","name":"Gottfried und Julia Bangerter-Rhyner-Stiftung","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100005688","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100012654","name":"Olga Mayenfisch Stiftung","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100012654","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100017659","name":"Uniscientia Foundation","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100017659","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Genet."],"abstract":"<jats:p>Osteogenesis imperfecta (OI) is an inherited skeletal dysplasia characterized by low bone density, bone fragility and recurrent fractures. The characterization of its heterogeneous genetic basis has allowed the identification of novel players in bone development. In 2016, we described the first X-linked recessive form of OI caused by hemizygous <jats:italic>MBTPS2<\/jats:italic> missense variants resulting in moderate to severe phenotypes. <jats:italic>MBTPS2<\/jats:italic> encodes site-2 protease (S2P), which activates transcription factors involved in bone (OASIS) and cartilage development (BBF2H7), ER stress response (ATF6) and lipid metabolism (SREBP) via regulated intramembrane proteolysis. In times of ER stress or sterol deficiency, the aforementioned transcription factors are sequentially cleaved by site-1 protease (S1P) and S2P. Their N-terminal fragments shuttle to the nucleus to activate gene transcription. Intriguingly, missense mutations at other positions of <jats:italic>MBTPS2<\/jats:italic> cause the dermatological spectrum condition Ichthyosis Follicularis, Atrichia and Photophobia (IFAP) and Keratosis Follicularis Spinulosa Decalvans (KFSD) without clinical overlap with OI despite the proximity of some of the pathogenic variants. To understand how single amino acid substitutions in S2P can lead to non-overlapping phenotypes, we aimed to compare the molecular features of <jats:italic>MBTPS2<\/jats:italic>-OI and <jats:italic>MBTPS2<\/jats:italic>-IFAP\/KFSD, with the ultimate goal to unravel the pathomechanisms underlying <jats:italic>MBTPS2<\/jats:italic>-OI. RNA-sequencing-based transcriptome profiling of primary skin fibroblasts from healthy controls (<jats:italic>n<\/jats:italic> = 4), <jats:italic>MBTPS2<\/jats:italic>-OI (<jats:italic>n<\/jats:italic> = 3), and <jats:italic>MBTPS2-<\/jats:italic>IFAP\/KFSD (<jats:italic>n<\/jats:italic> = 2) patients was performed to identify genes that are differentially expressed in <jats:italic>MBTPS2<\/jats:italic>-OI and <jats:italic>MBTPS2-<\/jats:italic>IFAP\/KFSD individuals compared to controls. We observed that SREBP-dependent genes are more downregulated in OI than in IFAP\/KFSD. This is coupled to alterations in the relative abundance of fatty acids in <jats:italic>MBTPS2<\/jats:italic>-OI fibroblasts <jats:italic>in vitro<\/jats:italic>, while no consistent alterations in the sterol profile were observed. Few OASIS-dependent genes are suppressed in <jats:italic>MBTPS2<\/jats:italic>-OI, while BBF2H7- and ATF6-dependent genes are comparable between OI and IFAP\/KFSD patients and control fibroblasts. Importantly, we identified genes involved in cartilage physiology that are differentially expressed in <jats:italic>MBTPS2-<\/jats:italic>OI but not in <jats:italic>MBTPS2<\/jats:italic>-IFAP\/KFSD fibroblasts. In conclusion, our data provide clues to how pathogenic <jats:italic>MBTPS2<\/jats:italic> mutations cause skeletal deformities via altered fatty acid metabolism or cartilage development that may affect bone development, mineralization and endochondral ossification.<\/jats:p>","DOI":"10.3389\/fgene.2021.662751","type":"journal-article","created":{"date-parts":[[2021,5,21]],"date-time":"2021-05-21T07:48:29Z","timestamp":1621583309000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":7,"title":["Omics Profiling of S2P Mutant Fibroblasts as a Mean to Unravel the Pathomechanism and Molecular Signatures of X-Linked MBTPS2 Osteogenesis Imperfecta"],"prefix":"10.3389","volume":"12","author":[{"given":"Pei Jin","family":"Lim","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Severin","family":"Marfurt","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Uschi","family":"Lindert","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lennart","family":"Opitz","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Timoth\u00e9e","family":"Ndarugendamwo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pakeerathan","family":"Srikanthan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Martin","family":"Poms","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Martin","family":"Hersberger","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Claus-Dieter","family":"Langhans","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dorothea","family":"Haas","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marianne","family":"Rohrbach","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Cecilia","family":"Giunta","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2021,5,21]]},"reference":[{"key":"B1","doi-asserted-by":"publisher","first-page":"1125","DOI":"10.1002\/humu.21335","article-title":"Keratosis Follicularis Spinulosa Decalvans is caused by mutations in MBTPS2.","volume":"31","author":"Aten","year":"2010","journal-title":"Hum. 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