Abstract
Background: Genetic disorders are enormously diverse both in terms of genotype and phenotype. Each case requires a careful and cautious investigation. Case Presentation: In this paper, we report two siblings who were admitted to our clinic with various symptoms. The older one, a 13-year old boy, presented with mental retardation, lack of speech, autistic behavior, and selfmutilation. And the younger one, a 6-month old girl, presented with growth retardation, dysmorphic face, and strabismus. We used next generation sequencing for our definitive diagnoses and followed a path from genotype to phenotype. Conclusion: We found homozygous changes in DGUOK (NM_080916.2 c.566T>G) and HPS5 (NM_181507.1 c.219G>A) genes in the siblings. In the literature review, we did not find any article that investigates two different autosomal recessive disorders in two siblings. On this aspect, we present a different approach.
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