Prenatal diagnosis and molecular cytogenetic characterization of mosaicism for a small supernumerary marker chromosome derived from chromosome 21q11.2-q21.1 and a literature review

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Title:	Prenatal diagnosis and molecular cytogenetic characterization of mosaicism for a small supernumerary marker chromosome derived from chromosome 21q11.2-q21.1 and a literature review
Authors:	陳持平;Chih-Ping Chen;Ming Chen;Chia-Hsun Wu;Chen-Ju Lin;Schu-Rern Ch;Schu-Rern Chern;Peih-Shan Wu;Yen-Ni Chen;Shin-Wen Che;Shin-Wen Chen;Shun-Ping Ch;Shun-Ping Chang;Li-Feng Chen;Wayseen Wang
Contributors:	生物科技學系
Date:	2017-08
Issue Date:	2017-10-30 02:40:29 (UTC+0)
Abstract:	Objective We present prenatal diagnosis and molecular cytogenetic characterization of mosaicism for a small supernumerary marker chromosome (sSMC) derived from chromosome 21q11.2-q21.1, and we review the literature of an sSMC(21) with a duplication of 21q11.2-q21.1. Case report A 40-year-old woman underwent amniocentesis at 17 weeks of gestation because of advanced maternal age. Amniocentesis revealed a karyotype of 47,XX,+mar [18]/46,XX [4]. The parental karyotypes were normal. Prenatal ultrasound findings were unremarkable. aCGH analysis of cultured amniocytes revealed a 2.855-Mb duplication of 21q11.2-q21.1 encompassing the genes of LIPI, ABCC13 and NRIP1. Metaphase fluorescence in situ hybridization analysis on cultured amniocytes revealed a result of 47,XX,+mar .ish der(13/21) (D13/21Z1+) [10]. Spectral karyotyping analysis determined the origin of chromosome 21 in the sSMC. A female fetus was delivered with no phenotypic features of Down syndrome and no structural abnormalities. We discuss the genotype–phenotype correlation of LIPI, ABCC13 and NRIP1, and review the literature of an sSMC(21) associated with dup(21)(q11.2q21.1). Conclusion aCGH is useful for identification of the nature and genetic component of a prenatally detected sSMC. Keywords 21q11.2-q21.1 duplicationArray comparative genomic hybridizationChromosome 21Small supernumerary marker chromosome
Relation:	TAIWANESE JOURNAL OF OBSTETRICS & GYNECOLOGY
Appears in Collections:	[Department of Biotechnology] Journal Article

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