Molecular and Cellular Biochemistry

, Volume 303, Issue 1–2, pp 9–17

Typical phenotypic spectrum of velocardiofacial syndrome occurs independently of deletion size in chromosome 22q11.2

  • Paula Sandrin-Garcia
  • Dagma V. M. Abramides
  • Lúcia R. Martelli
  • Ester S. Ramos
  • Antônio Richieri-Costa
  • Geraldo A. S. Passos
Article

Abstract

Velocardiofacial syndrome (VCFS) is a relatively common developmental disorder characterized by craniofacial anomalies and conotruncal heart defects. Many VCFS patients present hemizygous deletions on part of chromosome 22q11.2; suggestive that haploinsufficiency in this region is responsible for this etiology. Most 22q11.2 deletions occur sporadically, although in some cases the deletion may be transmitted. A total of 29 VCFS patients and their parents were genotyped using six consecutive polymorphic markers (STS) of the chromosome 22q11.2: D22S420, D22S941, D22S264, D22S306, D22S425, and D22S257. The results revealed that 72% (21/29) of the patients harbored a deletion involving the polymorphic markers D22S420, D22S941, and/or D22S264. Haplotype analysis showed that among the patients studied, the deletions were either of maternal or paternal origin. Our findings demonstrated that independently of their size, any deletion occurring in the VCFS critical region is enough to confer the patient phenotype.

Keywords

Velocardiofacial syndrome 22q11.2 deletion Microdeletion syndrome Genotyping analysis Parental analysis 

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Paula Sandrin-Garcia
    • 1
  • Dagma V. M. Abramides
    • 2
  • Lúcia R. Martelli
    • 1
  • Ester S. Ramos
    • 1
  • Antônio Richieri-Costa
    • 2
  • Geraldo A. S. Passos
    • 1
    • 3
  1. 1.Molecular Immunogenetics Group, Department of Genetics, Faculty of Medicine of Ribeirão PretoUniversity of São Paulo (USP)Ribeirao PretoBrazil
  2. 2.Craniofacial Anomalies Rehabilitation Hospital, USPBauruBrazil
  3. 3.Discipline of Genetics, Department of Morphology (DMEF), Faculty of DentistryUSPRibeirao PretoBrazil

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