"Essentially" pure trisomy 3q27 --> qter: further delineation of the partial trisomy 3q phenotype.
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.
Department of Medical Genetics, Molecular and Clinical Pharmacology, Division of Clinical Genetics, Innsbruck Medical University, Innsbruck, Austria.
Vera
V
Grossmann
Doris
D
Müller
Wilfried
W
Müller
Friedrich
F
Fresser
Martin
M
Erdel
Andreas R
AR
Janecke
Johannes
J
Zschocke
Gerd
G
Utermann
Dieter
D
Kotzot
D000328:Adult; D002675:Child, Preschool; D002871:Chromosome Banding; D002893:Chromosomes, Human, Pair 3 / Q000235:genetics*; D005260:Female; D020440:Gene Duplication; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D007231:Infant, Newborn; D010641:Phenotype; D014314:Trisomy / Q000235:genetics*