Genotype-phenotype correlations and clinical diagnostic criteria in Wolf-Hirschhorn syndrome

Marcella Zollino, Giuseppe Zampino, Pierpaolo Mastroiacovo, Giovanni Neri, Tracy J. Wright, Giovanni Sorge, Angelo Selicorni, Romano Tenconi, Agatino Battaglia, Maja Di Rocco, Giandomenico Palka, Rosanna Pallotta, Michael R. Altherr

Risultato della ricerca: Contributo in rivistaArticolo in rivista

138 Citazioni (Scopus)

Abstract

We report on a clinical-genetic study of 16 Wolf-Hirschhorn syndrome (WHS) patients. Hemizygosity of 4p16.3 was detected by conventional prometaphase chromosome analysis (11 patients) or by molecular probes on apparently normal chromosomes (4 patients). One patient had normal chromosomes without a detectable molecular deletion within the WHS "critical region." In each deleted patient, the deletion was demonstrated to be terminal by fluorescence in situ hybridization (FISH). The proximal breakpoint of the rearrangement was established by prometaphase chromosome analysis in cases with a visible deletion. It was within the 4p16.1 band in six patients, apparently coincident with the distal half of this band in five patients. The extent of each of the four submicroscopic deletions was established by FISH analyses with a set of overlapping cosmid clones spanning the 4p16.3 region. We found ample variations in both the size of the deletions and the position of the respective breakpoints. The precise definition of the cytogenetic defect permitted an analysis of the genotype-phenotype correlations in WHS, leading to the proposal of a set of minimal diagnostic criteria, which in turn may facilitate the selection of critical patients in the search for the gene(s) responsible for this disorder. We observed that genotype-phenotype correlations in WHS mostly depend on the size of the deletion, a deletion of <3.5 Mb resulting in a mild phenotype, in which malformations are absent. The absence of a detectable molecular deletion is still consistent with a WHS diagnosis. Based on these observations a "minimal" WHS phenotype was inferred, the clinical manifestations of which are restricted to the typical facial appearance, mild mental and growth retardation, and congenital hypotonia.
Lingua originaleEnglish
pagine (da-a)254-261
Numero di pagine8
RivistaAmerican Journal of Medical Genetics
Volume94
Stato di pubblicazionePubblicato - 2000

Keywords

  • Abnormalities, Multiple
  • Adolescent
  • Brain
  • Child
  • Child, Preschool
  • Chromosome Deletion
  • Chromosomes, Human, Pair 4
  • Cosmids
  • DNA Probes
  • Developmental Disabilities
  • Facies
  • Female
  • Gene Deletion
  • Genotype
  • Humans
  • In Situ Hybridization, Fluorescence
  • Infant
  • Intellectual Disability
  • Karyotyping
  • Kidney
  • Male
  • Models, Genetic
  • Phenotype
  • Seizures
  • Syndrome

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