Missense MED12 variants in 22 males with intellectual disability: From nonspecific symptoms to complete syndromes

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....

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Bibliographic Details
Published in:American journal of medical genetics. Part A 2023-01, Vol.191 (1), p.135-143
Main Authors: Maia, Nuno, Ibarluzea, Nekane, Misra‐Isrie, Mala, Koboldt, Daniel C., Marques, Isabel, Soares, Gabriela, Santos, Rosário, Marcelis, Carlo L. M., Keski‐Filppula, Riikka, Guitart, Miriam, Gabau Vila, Elisabeth, Lehman, April, Hickey, Scott, Mori, Mari, Terhal, Paulien, Valenzuela, Irene, Lasa‐Aranzasti, Amaia, Cueto‐González, Anna Maria, Chhouk, Brian H., Yeh, Rebecca C., Neil, Jennifer E., Abu‐Libde, Bassam, Kleefstra, Tjitske, Elting, Mariet W., Császár, Andrea, Kárteszi, Judit, Bessenyei, Beáta, Bokhoven, Hans, Jorge, Paula, Hagen, Johanna M., Brouwer, Arjan P. M.
Format: Article
Language:English
Subjects:
Blepharophimosis - genetics
genotype
Genotypes
Humans
Intellectual disabilities
intellectual disability
Intellectual Disability - diagnosis
Intellectual Disability - genetics
Male
MED12
Mediator Complex - genetics
Mental Retardation, X-Linked - genetics
Mutation, Missense - genetics
Original
Phenotype
Phenotypes
Statistical analysis
Syndrome
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Summary: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.
ISSN:1552-4825
1552-4833
DOI:10.1002/ajmg.a.63004