Genetic heterogeneity and phenotypic anomalies in children with atrioventricular canal defect and tetralogy of Fallot.

Abstract:

:Tetralogy of Fallot associated with the atrioventricular canal defect has been usually reported in association with Down syndrome. The aim of the present study was to describe the cardiac aspects and the genetic anomalies in children with this association of heart defects. We identified 64 patients with atrioventricular canal defect tetralogy of Fallot. All children underwent complete cardiovascular, clinical phenotypic and genetic evaluation. A genetic syndrome or extracardiac anomalies were found in 56 patients (87.5%). Down syndrome (43 patients, 67.2%) was the most frequent genetic diagnosis. Other syndromes were 8p deletion, trisomy 13, duplication 5p, cranio-cerebello-cardiac syndrome, Cantrell syndrome, CHARGE association, VACTERL association, and DiGeorge syndrome related to maternal diabetes. No patients in our series had 22q11 deletion. Tetralogy of Fallot with extreme dextroposition of the aorta was found in seven patients (only one with Down syndrome). Additional cardiac malformations were present in 23 patients (only 11 with Down syndrome). The association between atrioventricular canal defect and tetralogy of Fallot represents a cardiac phenotype with strong genetic characteristics. For this reason, a careful genetic examination is required. Our study confirms the high prevalence of Down syndrome, but also reveals a significant genetic heterogeneity. Additional cardiac defects are prevalent in patients without Down syndrome.

journal_name

Clin Dysmorphol

journal_title

Clinical dysmorphology

authors

Vergara P,Digilio MC,De Zorzi A,Di Carlo D,Capolino R,Rimini A,Pelegrini M,Calabro R,Marino B

doi

10.1097/01.mcd.0000198925.94082.ea

subject

Has Abstract

pub_date

2006-04-01 00:00:00

pages

65-70

issue

2

eissn

0962-8827

issn

1473-5717

pii

00019605-200604000-00003

journal_volume

15

pub_type

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