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Genetic studies have revealed several MP-associated loci, suggesting that MP could be inherited as familial MP (fMP). However, functional verifications and in-depth mechanistic investigations of these loci are limited. For this study, we recruited 5 fMP families with 17 fMP members and 7 normal members. We first compared the clinical features of the 17 fMP members with 31 nonfamilial MP patients, finding a stronger mandibular overgrowth phenotype in the fMP subjects. Next, we performed whole-exome sequencing analysis with members of the 5 fMP families and singled out a potential fMP-associated pathogenic variant in the\n                    <jats:italic toggle=\"yes\">CASR<\/jats:italic>\n                    gene (namely, rs117375173); the mutation introduces an amino acid substitution (A601G) in exon 7 and confers gain of function in Calcium-Sensing Receptor (CaSR). The rs11735173 variant changes the CaSR protein structure toward a semiactive state, similar to CaSR activated by L-tryptophan (L-Trp). To verify the regulating roles of\n                    <jats:italic toggle=\"yes\">CASR<\/jats:italic>\n                    in mandibular bone growth, we further generated different mouse models with abnormal CaSR function. L-Trp administration effectively activated CaSR\/GNAQ expression in vivo and in vitro. The MC3T3-E1 cell line transfected with CaSR with rs117375173 (CaSR\n                    <jats:sup>A601G<\/jats:sup>\n                    ) showed increased osteogenic differentiation and collagen synthesis at the transcriptional level. Local injection of L-Trp in the mandible of growing mice significantly increased the mandibular length and BMD, due to activated osteogenic activity and suppressed bone resorption. At the same time, loss of function of CaSR in osteogenic progenitors caused mandibular growth retardation in\n                    <jats:italic toggle=\"yes\">\n                      Gli1-Cre\n                      <jats:sup>ER<\/jats:sup>\n                      ; Casr\n                      <jats:sup>fl\/fl<\/jats:sup>\n                      ; tdTomato\n                      <jats:sup>fl\/+<\/jats:sup>\n                    <\/jats:italic>\n                    mice. In conclusion, our study reveals that abnormal functioning of CaSR affects mandibular bone development and may contribute to the pathogenesis of fMP, providing a theoretical and experimental basis for the early diagnosis of and therapeutic strategies for fMP in clinical practice.\n                  <\/jats:p>","DOI":"10.1177\/00220345251384290","type":"journal-article","created":{"date-parts":[[2025,11,4]],"date-time":"2025-11-04T06:16:27Z","timestamp":1762236987000},"page":"949-958","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":0,"title":["CaSR Activation Triggers Mandibular Overgrowth in Familial Mandibular Prognathism Patients and Mice"],"prefix":"10.1177","volume":"105","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4817-9375","authenticated-orcid":false,"given":"H.","family":"Fang","sequence":"first","affiliation":[{"name":"State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Department of Orthognathic and TMJ Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"P.","family":"Li","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Department of Orthognathic and TMJ Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Y.","family":"Wei","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Department of Cariology and Endodontics, West China Hospital of Stomatology, Chengdu, Sichuan, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"H.","family":"Li","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Department of Orthognathic and TMJ Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"P.","family":"Wang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Department of Orthognathic and TMJ Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"X.","family":"Yang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Department of Orthognathic and TMJ Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"H.","family":"Yu","sequence":"additional","affiliation":[{"name":"West China Biomedical Big Data Center, West China Hospital, Sichuan University, Chengdu, China"},{"name":"Med-X Center for Informatics, Sichuan University, Chengdu, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Y.","family":"Fan","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Department of Cariology and Endodontics, West China Hospital of Stomatology, Chengdu, Sichuan, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"S.","family":"Zhu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Department of Orthognathic and TMJ Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8297-9691","authenticated-orcid":false,"given":"R.","family":"Bi","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Department of Orthognathic and TMJ Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2025,11,3]]},"reference":[{"key":"e_1_3_2_2_1","doi-asserted-by":"publisher","DOI":"10.1038\/nmeth0410-248"},{"issue":"4","key":"e_1_3_2_3_1","first-page":"280","article-title":"Who seeks surgical-orthodontic treatment: a current review","volume":"16","author":"Bailey LJ","year":"2001","unstructured":"Bailey LJ, Haltiwanger LH, Blakey GH, Proffit WR. 2001. 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