Elsevier

Genomics

Volume 10, Issue 1, May 1991, Pages 201-206
Genomics

Microdeletions within 22q11 associated with sporadic and familial DiGeorge syndrome

https://doi.org/10.1016/0888-7543(91)90501-5Get rights and content

Abstract

DiGeorge syndrome (DGS) is a developmental field defect of the third and fourth pharyngeal pouches. It is associated wit with deletion of 22q11 in 11% of cases. Molecular genetic analysis with probes from 22q11-pter reveals that a subset of markers is hemizygous in DGS patients with normal karyotypes. There is no apparent difference in the phenotype or the severity of the disorder between patients with the smallest detectable submicroscopic deletion and those with the largest cytogenetically visible abnormality. A microdeletion was found in a mildly affected child and in the severely affected child of a mildly affected father. Dysmorphology, especially cardiac outflow tract anomalies, resulting from 22q11 deletion may be more common than currently realized since chromosomes are unlikely to be checked if the complete spectrum of DGS is not present. Antenatal diagnosis, through detection of hemizygosity at 22q11, will be a possibility for mildly affected parents unwilling to risk the birth of a severely affected child.

References (27)

  • D.E. Bockman et al.

    Dependence of thymus development on derivatives of the neural crest

    Science

    (1984)
  • A. dela Chapelle et al.

    A deletion in chromosome 22 can cause DiGeorge syndrome

    Hum. Genet

    (1981)
  • B.S. Emanuel

    Molecular cytogenetics: Toward dissection of the contiguous gene syndromes

    Am. J. Hum. Genet

    (1988)
  • Cited by (0)

    1

    Current address: Green College, Oxford, UK.

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