Mutation Screening of Gata4 Gene in CTD Patients Within Chinese Han Population

Area of Science:

• Genetics
• Cardiology
• Molecular Biology

Background:

• Conotruncal heart defect (CTD) is a severe congenital heart disease with a poor prognosis.
• Previous studies suggested GATA4 gene missense variants may contribute to CTD, but lacked sufficient evidence due to limited study populations.
• Understanding the genetic basis of CTD is crucial for improving diagnosis and treatment.

Purpose of the Study:

• To investigate GATA4 gene mutations in isolated CTD Chinese Han patients.
• To identify the pathomechanism of identified GATA4 missense mutations.
• To evaluate the functional impact of a novel GATA4 variant (p.A167D).

Main Methods:

• Sequencing of GATA4 coding exons and exon-intron boundaries in 600 CTD patients and 300 controls.
• In silico analysis of the novel GATA4 variant (p.A167D) using PolyPhen 2 and SIFT.
• Functional assays including luciferase reporter assay and Western blot to assess mutant GATA4 protein activity.

Main Results:

• Eight heterozygous nonsynonymous GATA4 variants were identified in 22 CTD patients.
• A novel variant, p.A167D, was identified and predicted to affect protein function by in silico tools.
• Functional analyses showed no significant alteration in transcriptional activity or protein levels for the A167D mutant GATA4.

Conclusions:

• The identified GATA4 variants, including the novel A167D mutation, may not be the primary cause of CTD in this cohort.
• The pathomechanism of CTD in these patients might involve other genetic or environmental factors.
• Further research is needed to elucidate the complex etiology of conotruncal heart defects.