Biallelic Variant in SLC6A17 in a Pakistani Family With Autosomal Recessive Intellectual Disability

Autosomal recessive intellectual disability affects 1%–33% of the general population and is a major concern in countries where consanguineous marriages are common. Mental retardation autosomal recessive 48 (MRT 48) (OMIM 616269) is a recessive syndromic disorder characterized by progressive tremors, speech impairment, and behavioral problems. In the present study, we highlight a family with a case of MRT 48. The index patient was second born to healthy consanguineous parents with a history of intellectual disability. Whole exome sequencing of the patient was performed, which revealed a homozygous c.1693T>C;p.(Tyr565His) variant in the SLC6A17 gene. The variant segregated in the extended family with the phenotype. This study broadens the genotypic spectrum of SLC6A17 variants.