GATA4 sequence variants in patients with congenital heart disease.
BACKGROUND
Recent reports have identified mutations in the transcription factor GATA4 in familial cases of cardiac septal defects. The prevalence of GATA4 mutations in the population of patients with septal defects is unknown. Given that patients with septal and conotruncal defect can share a common genetic basis, it is unclear whether patients with additional types of CHD might also have GATA4 mutations.


OBJECTIVE
To explore these questions by investigating a large population of 628 patients with either septal or conotruncal defects for GATA4 sequence variants.


METHODS
The GATA4 coding region and exon-intron boundaries were investigated for sequence variants using denaturing high-performance liquid chromatography or conformation-sensitive gel electrophoresis. Samples showing peak or band shifts were reamplified from genomic DNA and sequenced.


RESULTS
Four missense sequence variants (Gly93Ala, Gln316Glu, Ala411Val, Asp425Asn) were identified in five patients (two with atrial septal defect, two with ventricular septal defect and one with tetralogy of Fallot), which were not seen in a control population. All four affected amino acid residues are conserved across species, and two of the sequence variants lead to changes in polarity. Ten synonymous sequence variants were also identified in 18 patients, which were not seen in the control population.


CONCLUSIONS
These data suggest that non-synonymous GATA4 sequence variants are found in a small percentage of patients with septal defects and are very uncommonly found in patients with conotruncal defects.
Division of Cardiology, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania 19104, USA.
A
A
Tomita-Mitchell
C L
CL
Maslen
C D
CD
Morris
V
V
Garg
E
E
Goldmuntz
D020816:Amino Acid Motifs; D019943:Amino Acid Substitution; D015331:Cohort Studies; D017124:Conserved Sequence; D050991:GATA4 Transcription Factor / Q000737:chemistry / Q000235:genetics*; D018740:Genetic Heterogeneity; D006330:Heart Defects, Congenital / Q000145:classification / Q000235:genetics*; D006343:Heart Septal Defects / Q000235:genetics; D006801:Humans; D020125:Mutation, Missense; D019683:Penetrance; D017354:Point Mutation; D011446:Prospective Studies; D017434:Protein Structure, Tertiary; D013771:Tetralogy of Fallot / Q000235:genetics
D050991:GATA4 Transcription Factor