A new de novo mutation in HTRA1 gene associated with painful Ataxia, developmental delay, and autistic behaviors symptoms in an Iranian boy through Whole Exome Sequencing followed by homology modeling
1.1. Introduction: Due to the insufficiency of understanding about Dominant Arteriopathy with Subcortical Infarcts and Leukoen cephalopathy (CADASIL) in general clinical studies, the process of diagnosis for most CADASIL patients is complex and often prolonged. The disease’s symptomatic heterogeneity, which hap pens frequently even among family members, increases the com plexity of diagnosis. 1.2. Methods: In vitro analysis was carried out by Whole Exome Sequencing (WES) for a 2-year-old boy. He had ataxia, develop mental delay, delayed speech and language development, and au tistic behaviors. Mutational confirmations were also done on both of his parents to find the genotypes. Also, bioinformatics predic tions were performed by SWISS-MODEL, ProSA, Molprobity, and superimposition through MatchMaker in Chimera ver. 1.16. 1.3. Results: WES analysis uncovered a novel de novo missense mutation in the HTRA1 gene (exon1:c.320C>T:p.A107V) in the case. Mutation conformations documented the homozygosity of the normal allele in both of the case’s parents. Superimposition predictions suggested two beta-sheet unfolded in the mutant model (T allele or Val107). 1.4. Conclusion: Consequently, in an autosomal dominant pattern of genetic inheritance, the current study described a novel de novo mutation in the HTRA1 gene (A107V) associated with neurologi cal features such as painful ataxia, and developmental and speech delays. Pain management is necessary in this case and future cases with the same symptoms.