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Those with the typical 15q11\u2013q13 Type I deletion compared with the smaller Type II deletion have more severe neurobehavioral problems and differ by the absence of four genes in the 15q11.2 BP1\u2013BP2 region. Two of the genes encode magnesium transporters supporting brain and neurological function and we report on magnesium levels in the two deletion groups of PWS participants. We measured baseline plasma magnesium and analyzed data from a PWS cohort with and without the Type I or Type II deletion. Significantly lower plasma magnesium levels were found in PWS participants with the larger Type I deletion and more so with females with Type I deletion compared with females having the Type II deletion, although magnesium levels remained within normal range in both subgroups. Those with PWS and the larger 15q11\u2013q13 Type I deletion were more clinically affected than those with the smaller Type II deletion. Two of the four genes missing in those with the larger deletion code for magnesium transporters and may impact magnesium levels. Our study showed lower magnesium levels in those with the larger deletion which could contribute to neurobehavioral differences seen in the two separate 15q11\u2010q13 deletion subtypes and in addition affect both glucose and insulin metabolism impacting comorbidities but will require more research.<\/jats:p>","DOI":"10.1002\/ajmg.a.62928","type":"journal-article","created":{"date-parts":[[2022,8,6]],"date-time":"2022-08-06T13:23:55Z","timestamp":1659792235000},"page":"3278-3286","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["<scp>Prader\u2013Willi<\/scp> syndrome, deletion subtypes, and magnesium: Potential impact on clinical findings"],"prefix":"10.1002","volume":"188","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2911-0524","authenticated-orcid":false,"given":"Merlin G.","family":"Butler","sequence":"first","affiliation":[{"name":"Department of Psychiatry &amp; Behavioral Sciences and Pediatrics University of Kansas Medical Center  Kansas City Kansas USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Neil","family":"Cowen","sequence":"additional","affiliation":[{"name":"Soleno Therapeutics, Inc.  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