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Immunological abnormalities, the resulting endocrinopathies, and their treatments may compromise bone health. For the first time in APS1, we analyzed transiliac bone biopsy samples by bone histomorphometry and quantitative backscattered electron imaging in three adult patients (female P1, 38\u00a0years; male P2, 47\u00a0years; male P3, 25\u00a0years). All had biallelic mutations in the autoimmune regulator gene and in addition to endocrinopathies, also significant bone fragility. Histomorphometry showed bone volume in the lower normal range for P1 (BV\/TV, \u2212\u00a00.98 SD) and P3 (\u2212\u00a01.34 SD), mainly due to reduced trabecular thickness (TbTh, \u2212\u00a03.63 and \u2212\u00a02.87 SD). In P1, osteoid surface was low (OS\/BS, \u2212\u00a00.96 SD); active osteoblasts and double labeling were seen only on cortical bone. P3 showed a largely increased bone turnover rate (BFR\/BV,\u2009+\u20094.53 SD) and increased mineralization lag time (Mlt,\u2009+\u20093.40 SD). Increased osteoid surface (OS\/BS,\u2009+\u20092.03 and\u2009+\u20094.71 SD for P2 and P3) together with a large proportion of lowly mineralized bone area (Trab CaLow,\u2009+\u20092.22 and\u2009+\u20099.81 SD for P2 and P3) and focal mineralization defects were consistent with abnormal mineralization. In all patients, the density and area of osteocyte lacunae in cortical and trabecular bone were similar to healthy adults. The bone tissue characteristics were variable and included decreased trabecular thickness, increased amount of osteoid, and abnormal mineralization which are likely to contribute to bone fragility in patients with APS1.<\/jats:p>","DOI":"10.1007\/s00223-023-01077-0","type":"journal-article","created":{"date-parts":[[2023,3,27]],"date-time":"2023-03-27T03:20:28Z","timestamp":1679887228000},"page":"675-682","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Bone Tissue Evaluation Indicates Abnormal Mineralization in Patients with Autoimmune Polyendocrine Syndrome Type I: Report on Three Cases"],"prefix":"10.1007","volume":"112","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5588-7855","authenticated-orcid":false,"given":"Saila","family":"Laakso","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tong","family":"Xiaoyu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"St\u00e9phane","family":"Blouin","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Petra","family":"Keplinger","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ville-Valtteri","family":"V\u00e4lim\u00e4ki","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Heikki","family":"Kr\u00f6ger","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Outi","family":"M\u00e4kitie","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Markus A.","family":"Hartmann","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2023,3,22]]},"reference":[{"key":"1077_CR1","doi-asserted-by":"publisher","first-page":"1395","DOI":"10.1126\/science.1075958","volume":"298","author":"MS Anderson","year":"2002","unstructured":"Anderson MS, Venanzi ES, Klein L et al (2002) Projection of an immunological self shadow within the thymus by the aire protein. 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