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Identification of C12orf4 as a gene for autosomal recessive intellectual disability
Author(s) -
Philips A.K.,
Pinelli M.,
de Bie C.I.,
Mustonen A.,
Määttä T.,
Arts H.H.,
Wu K.,
Roepman R.,
Moilanen J.S.,
Raza S.,
Varilo T.,
Scala G.,
Cocozza S.,
Gilissen C.,
van Gassen K.L.I.,
Järvelä I.
Publication year - 2017
Publication title -
clinical genetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.543
H-Index - 102
eISSN - 1399-0004
pISSN - 0009-9163
DOI - 10.1111/cge.12821
Subject(s) - genetics , frameshift mutation , exome sequencing , intellectual disability , missense mutation , biology , consanguinity , gene , genetic counseling , genetic linkage , founder effect , genetic heterogeneity , disease gene identification , human genetics , mutation , phenotype , allele , haplotype
Intellectual disability (ID) is a major health problem in our society. Genetic causes of ID remain unknown because of its vast heterogeneity. Here we report two Finnish families and one Dutch family with affected individuals presenting with mild to moderate ID, neuropsychiatric symptoms and delayed speech development. By utilizing whole exome sequencing (WES), we identified a founder missense variant c. 983T >C (p. Leu328Pro ) in seven affected individuals from two Finnish consanguineous families and a deletion c.799_1034‐ 429delinsTTATGA (p.Gln267fs) in one affected individual from a consanguineous Dutch family in the C12orf4 gene on chromosome 12. Both the variants co‐segregated in the respective families as an autosomal recessive trait. Screening of the p. Leu328Pro variant showed enrichment in the North Eastern sub‐isolate of Finland among anonymous local blood donors with a carrier frequency of 1:53, similar to other disease mutations with a founder effect in that region. To date, only one Arab family with a three affected individuals with a frameshift insertion variant in C12orf4 has been reported. In summary, we expand and establish the clinical and mutational spectrum of C12orf4 variants. Our findings implicate C12orf4 as a causative gene for autosomal recessive ID.