The diagnostic dilemma of rothmund-thomson syndrome Type II: A rare disorder with a novel mutation in the RECQL4 gene in an Indian Boy

Abstract

Rothmund-Thomson syndrome (RTS) is a rare autosomal recessive disorder caused by homozygous or compound heterozygous mutations in RECQL4 gene and has characteristic clinical features of poikiloderma, congenital bone defects, gastrointestinal disturbances such as chronic diarrhea and vomiting, and an increased susceptibility to malignancy. A 2½-year-old Indian boy presented with reticulate hyperpigmented erythema with superimposed hypopigmented atrophic macular lesions over the cheeks and diffuse background hyperpigmentation with multiple discrete atrophic hypopigmented macules of variable size over the abdomen and extensor aspects of the forearms. X-rays suggested metaphyseal irregularity around knee joint and radioulnar synostosis. Whole-exome sequencing was suggestive of a de novo novel RECQL4 gene mutation causing RTS Type II. There is an overlapping of clinical features of the group of syndrome associated with skin lesions, skeletal, and gastric manifestations. All these conditions present a challenge to the clinician. Thus, molecular diagnosis is the only way to resolve these phenotypically similar conditions. This report expands the RECQL4 gene pathogenic mutations spectrum.

Keywords

• hyperpigmented lesion
• metaphyseal irregularities
• poikiloderma
• recql4 gene
• rothmund-thomson syndrome