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Title: A Rare Case of Trisomy 15pter-q21.2 Due to a de Novo Marker Chromosome
Authors: Pacanaro, Ade Nubia Xavier [UNIFESP]
Christofolini, Denise Maria
Kulikowski, Leslie Domenici
Nogueira Belangero, Sintia Iole
Silva Bellucco, Fernanda Teixeira da
Varela, Monica C.
Koiffmann, Celia P.
Yoshimoto, Maisa
Squire, Jeremy A.
Schiavon, Adriana V.
Heck, Benjamin
Melaragno, Maria Isabel [UNIFESP]
Universidade Federal de São Paulo (UNIFESP)
Universidade de São Paulo (USP)
Univ Toronto
Hosp Sao Camilo Pompeia
Keywords: chromosome 15
duplication 15pter-q21.2
marker chromosome
partial trisomy
trisomy 15q
Issue Date: 1-Mar-2010
Publisher: Wiley-Blackwell
Citation: American Journal of Medical Genetics Part A. Hoboken: Wiley-liss, v. 152A, n. 3, p. 753-758, 2010.
Abstract: Supernumerary marker chromosomes (sSMC) may or may not be associated with an abnormal phenotype, depending on the presence of euchromatin, on their chromosomal origin and whether they are inherited. Over 80% of sSMCs are derived from acrocentric chromosomes and half of them include the short arm of chromosome 15. Generally, they appear as bisatellited isodicentric marker chromosomes, most of them are symmetric. These chromosomes are normally originated de novo and are associated with mild to severe intellectual disability but not with physical abnormalities. We report on a patient with an SMC studied using classical and molecular cytogenetic procedures (G and C banding, NOR staining, painting and centromeric fluorescent in situ hybridization (FISH), BAC-FISH, and SKY). the MLPA technique and DNA polymorphic markers were used in order to identify its parental origin. the marker chromosome, monosatellited and monocentric, was found to be derived from a maternal chromosome 15 and was defined as 15pter-q21.2. This is the report of the largest de novo monosatellited 15q marker chromosome ever published presenting detailed cytogenetic and clinical data. It was associated with a phenotype including cardiac defect, absence of septum pellucidum, and dysplasia of the corpus callosum. (C) 2010 Wiley-Liss, Inc.
ISSN: 1552-4825
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