ZNF142 Mutation Causes Neurodevelopmental Disorder with Speech Impairment and Seizures: Novel Variants and Literature Review

The ZNF142 gene on chromosome 2q35 contains ten exons and encodes a zinc finger protein 142 with 31 C2H2-type zinc fingers domain. Pathogenic variants in ZNF142 result in an autosomal recessive neurodevelopmental disorder with impaired speech and developmental delay. Here, we report two novel variants (NM_001105537: c.25C > T/c.1741C > T, p.Gln9*/p.Arg581Cys) in ZNF142 in an Iranian family identified by Whole-Exome sequencing and confirmed by Sanger sequencing. These variants are categorized as "pathogenic" and "variant of unknown significance" based on the standards for the interpretation of sequence variations recommended by ACMG, respectively. The proband is a five-year-old male born to consanguineous parents. The compound heterozygous variant (NM_001105537: c.25C > T/c.1741C > T, p.Gln9*/p.Arg581Cys) in ZNF142 was identified in the proband with moderate intellectual disability, global developmental delay, speech impairment, and seizures. This paper reported the sixth family in the world with novel pathogenic variants in the ZNF142 gene as the reason for neurodevelopmental Disorder with Impaired Speech and Hyperkinetic Movements (NEDISHM) and determining the phenotype spectrum of this disease. In this study, we also reviewed the phenotype of the former cases. In contrast to the Malaysian cases, proband in the present paper does not manifest any facial features similar to the patients in the initial study. Further studies on the NEDISHM patients could be valuable to determine the phenotype precisely.