Prenatal diagnosis and genetic counseling of an inherited Xq24q25 deletion associated with normal phenotype

Abstract

BackgroundCopy number variants (CNVs) are an important source of normal and pathogenic genome variations. CNVs identified in prenatal cases need careful considerations and correct interpretation if those are harmless or harmful variants from the norm.Case presentation A 28-year-old, gravida 1, para 0, woman underwent amniocentesis at 17 weeks of gestation because the noninvasive prenatal testing (NIPT) results revealed a 9.8 Mb deletion from Xq24 to Xq25. GTG-banding karyotype analysis was performed on cultured amniocytes. Chromosomal microarray analysis (CMA) on uncultured amniocytes was performed.ResultsChromosomal GTG-banding of the cultured amniocytes revealed a karyotype of 46,XX. CMA detected a 9.5-Mb chromosomal deletion in the region of Xq24q25 (arr[GRCh37] Xq24q25(118,975,436_128,444,692) × 1).ConclusionThe present report highlights that an integration of prenatal ultrasound, NIPT, karyotype analysis, CMA and genetic counseling is helpful for the prenatal diagnosis of chromosomal deletions/duplications.