" /> Digeorge syndrome - CISMeF





Preferred Label : Digeorge syndrome;

Symbol : DGS;

CISMeF acronym : DGCR; DGS;

Type : Phenotype, molecular basis known;

Alternative titles and symbols : Chromosome 22q11.2 deletion syndrome; Hypoplasia of thymus and parathyroids; Third and fourth pharyngeal pouch syndrome;

Included titles and symbols : Digeorge syndrome chromosome region; Takao vcf syndrome; Catch22; DGCR;

Description : DiGeorge syndrome (DGS) comprises hypocalcemia arising from parathyroid hypoplasia, thymic hypoplasia, and outflow tract defects of the heart. Disturbance of cervical neural crest migration into the derivatives of the pharyngeal arches and pouches can account for the phenotype. Most cases result from a deletion of chromosome 22q11.2 (the DiGeorge syndrome chromosome region, or DGCR). Several genes are lost including the putative transcription factor TUPLE1 which is expressed in the appropriate distribution. This deletion may present with a variety of phenotypes: Shprintzen, or velocardiofacial, syndrome (VCFS; 192430); conotruncal anomaly face (or Takao syndrome); and isolated outflow tract defects of the heart including tetralogy of Fallot, truncus arteriosus, and interrupted aortic arch. A collective acronym CATCH22 has been proposed for these differing presentations. A small number of cases of DGS have defects in other chromosomes, notably 10p13 (see 601362). In the mouse, a transgenic Hox A3 (Hox 1.5) knockout produces a phenotype similar to DGS as do the teratogens retinoic acid and alcohol.;

Inheritance : Autosomal dominant;

Molecular basis : A contiguous gene syndrome involving deletion of the DiGeorge syndrome chromosome region (DGCR) involving mutations in TUP-like enhancer of split 1 (TUPLE1, 600237) and DiGeorge critical region gene 2 (DGCR2, 600594);

Laboratory abnormalities : Neonatal hypocalcemia; Hypocalcemia (64% of adults); T-cell deficit; 85-90% DGS patients have deletion of 22q11.2; Other cytogenic abnormalities have been associated with DGS phenotype including monosomy 10p13, 11p13, and 4q21;

Prefixed ID : #188400;

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12/05/2024


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