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  • Title: Missense MED12 variants in 22 males with intellectual disability: From nonspecific symptoms to complete syndromes.
    Author: Maia N, Ibarluzea N, Misra-Isrie M, Koboldt DC, Marques I, Soares G, Santos R, Marcelis CLM, Keski-Filppula R, Guitart M, Gabau Vila E, Lehman A, Hickey S, Mori M, Terhal P, Valenzuela I, Lasa-Aranzasti A, Cueto-González AM, Chhouk BH, Yeh RC, Neil JE, Abu-Libde B, Kleefstra T, Elting MW, Császár A, Kárteszi J, Bessenyei B, van Bokhoven H, Jorge P, van Hagen JM, de Brouwer APM.
    Journal: Am J Med Genet A; 2023 Jan; 191(1):135-143. PubMed ID: 36271811.
    Abstract:
    We describe the phenotype of 22 male patients (20 probands) carrying a hemizygous missense variant in MED12. The phenotypic spectrum is very broad ranging from nonspecific intellectual disability (ID) to the three well-known syndromes: Opitz-Kaveggia syndrome, Lujan-Fryns syndrome, or Ohdo syndrome. The identified variants were randomly distributed throughout the gene (p = 0.993, χ2 test), but mostly outside the functional domains (p = 0.004; χ2 test). Statistical analyses did not show a correlation between the MED12-related phenotypes and the locations of the variants (p = 0.295; Pearson correlation), nor the protein domain involved (p = 0.422; Pearson correlation). In conclusion, establishing a genotype-phenotype correlation in MED12-related diseases remains challenging. Therefore, we think that patients with a causative MED12 variant are currently underdiagnosed due to the broad patients' clinical presentations.
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