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Background: Intellectual disability (ID) is a heterogonous disorder with complex etiology. The frequency of autosomal recessive inheritance defects was elevated in a consanguineous family. Methods: In this study, high-throughput DNA sequencing was performed in an Iranian consanguineous family with two affected individuals to find potential causative variants. Whole-exome sequencing was carried out on the proband and Sanger sequencing was implemented for validation of the likely causative variant in the family members. Results: A novel homozygous missense mutation (p.Arg122Trp) was detected in the PTRHD1 gene. Conclusion: PTRHD1 has been recently introduced as a candidate ID and Parkinsonism causing gene. Our findings are in agreement with the clinical spectrum of PTRHD1 mutations; however, our affected individuals suffer from ID manifestations.

The PTRHD1 Mutation in Intellectual Disability