Premium
“Essentially” pure trisomy 3q27 → qter: Further delineation of the partial trisomy 3q phenotype
Author(s) -
Grossmann Vera,
Müller Doris,
Müller Wilfried,
Fresser Friedrich,
Erdel Martin,
Janecke Andreas R.,
Zschocke Johannes,
Utermann Gerd,
Kotzot Dieter
Publication year - 2009
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.33058
Subject(s) - genetics , gene duplication , biology , chromosomal translocation , microcephaly , karyotype , breakpoint , chromosomal rearrangement , monosomy , trisomy , chromosome 4 , locus (genetics) , phenotype , chromosome , gene
Partial duplication 3q is a well defined clinical entity characterized by growth retardation, cryptorchism, microcephaly, and characteristic dysmorphisms. Most patients present with large duplications or are associated with a second chromosomal imbalance, which makes the definition of the phenotype difficult. Here, we report on a 4‐year and 8‐month‐old girl with pre‐ and postnatal measurements in the high normal range, developmental delay, minor dysmorphic features, and a de novo unbalanced 3/4 translocation with trisomy 3q27 → qter and monosomy of the subtelomeric region of 4p. Conventional karyotyping, FISH with probes from the Wolf–Hirschhorn syndrome critical region and chromosome 4p locus‐specific probes, microsatellite marker‐based haplotyping, and SNP microarray copy number analysis revealed a terminal 4p deletion of less than 500 kb with a breakpoint distal to the Wolf–Hirschhorn syndrome critical region, a chromosome 3q duplication of around 15.3 Mb, with origin of the rearrangement in paternal meiosis. Thus, our case clearly characterizes the phenotype of pure partial duplication 3q more exactly, and moreover, indicates that small chromosome rearrangements might lead to growth in the upper normal range or even cause overgrowth. © 2009 Wiley‐Liss, Inc.