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Molecular cytogenetic characterization of two small chromosome 8 derived supernumerary mosaic markers
Author(s) -
Herry A.,
Morel F.,
Le Bris M.J.,
Bellec V.,
Lallaoui H.,
Parent P.,
De Braekeleer Marc
Publication year - 2004
Publication title -
american journal of medical genetics part a
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.064
H-Index - 112
eISSN - 1552-4833
pISSN - 1552-4825
DOI - 10.1002/ajmg.a.30077
Subject(s) - marker chromosome , biology , small supernumerary marker chromosome , fluorescence in situ hybridization , centromere , genetics , supernumerary , chromosome 9 , chromosome , chromosomal inversion , ring chromosome , microbiology and biotechnology , karyotype , anatomy , gene
Two small supernumerary mosaic marker chromosomes (SMC) were identified by conventional cytogenetics, one prenatally, the other postnatally. Fluorescence in situ hybridization (FISH) techniques, including 24‐color FISH, were applied to identify both SMCs and better characterize their constitution. Patient 1: a 29 year‐old man, whose wife had a spontaneous abortion, was found to have a small ring of the pericentromeric region of chromosome 8 (47,XY,+r(8)(p11q11)/46,XY). Patient 2: a 37 year‐old woman had amniocentesis. The fetus was found to have a SMC; its presence was confirmed postnatally. Several FISH techniques (24‐color, whole chromosome paints, centromeres, telomeres, band 8p22) led to the identification of a small analphoid marker. The marker was an inversion–duplication for part of the short arm of chromosome 8 (47,XY,+inv dup (8)(p23pter)/46,XY). The 24‐color FISH allowed us to conclude that both markers originated exclusively from chromosome 8. However, the structure and content of the markers were elucidated using other molecular cytogenetic techniques, showing their complementarity. © 2004 Wiley‐Liss, Inc.