Clinical phenotype and genetic analysis of a child with 14q12q13 microdeletion syndrome manifesting as congenital hypothyroidism

Abstract

To analyze the clinical phenotype and genetic etiology for a child featuring congenital hypothyroidism (CH). Whole exome sequencing (WES), copy number variation (CNV) sequencing and chromosomal microarray analysis (CMA) were carried out for a newborn infant who had presented at Linyi People's Hospital for CH. Clinical data of the child was analyzed, in addition with a literature review. The main characteristics of the newborn infant had included peculiar face, vulvar edema, hypotonia, psychomotor retardation, recurrent respiratory tract infection with laryngeal wheezing and feeding difficulties. Laboratory test indicated hypothyroidism. WES suggested a CNV deletion on chromosome 14q12q13. CMA further confirmed a 4.12 Mb deletion at chromosome 14q12q13.3 (32649595_36769800), which has encompassed 22 genes including NKX2-1, the pathogenic gene for CH. The same deletion was found in neither of her parents. Through the analysis of clinical phenotype and genetic variant, the child was diagnosed with 14q12q13.3 microdeletion syndrome.