Compound craniosynostosis, intellectual disability, and Noonan-like facial dysmorphism associated with 7q32.3-q35 deletion.

Birth Defects Research
Ewelina Bukowska-OlechAleksander Jamsheer

Abstract

Craniosynostosis (CS) is the premature fusion of the cranial sutures, occurring either in isolated or syndromic form. Syndromic CS, which was described in over 180 genetic syndromes, accounts for 15-30% of all CS cases and usually originates from mutations within the FGFR1, FGFR2, FGFR3, and TWIST1 genes. However, causative alterations in other genes, or rarely copy number variations (CNVs) were also reported. In this article, we describe a patient with Noonan-like facial dysmorphism accompanied by intellectual disability and compound CS, involving coronal, sagittal, and squamous sutures. We applied karyotyping, copy number variations analysis using array comparative genomic hybridization, and microarray-based genes expresion analysis. We have shown that the index carried a large and rare heterozygous deletion, which encompassed 12.782 Mb and mapped to a chromosomal region of 7q32.3-q35 (HG38 - chr7:131837067-144607071). The aberration comprised 109 protein-coding genes, including BRAF, that encodes serine/threonine-protein kinase B-Raf, being a part of the RAS/MAPK signaling pathway. The RAS/MAPK pathway plays an essential role in human development; hence, its dysregulation not surprisingly results in severe congenital anomali...Continue Reading

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