Genetic factors in non-syndromic congenital heart malformations

Area of Science:

• Genetics
• Developmental Biology
• Cardiology

Background:

• Congenital heart malformations (CHM) affect a significant portion of newborns.
• The genetic basis for the majority of non-syndromic CHM cases is currently unknown.
• Over 40 genes have been linked to CHM, but monogenic causes are rare.

Purpose of the Study:

• To review the current understanding of genetic factors contributing to non-syndromic congenital heart malformations.
• To discuss the roles of high-penetrance monogenic mutations, reduced-penetrance susceptibility genes, and somatic mutations in CHM.
• To explore the applicability of the multifactorial inheritance hypothesis to CHM.

Main Methods:

• Literature review of genetic studies on non-syndromic congenital heart malformations.
• Analysis of genes implicated in CHM, categorizing them by mutation type and penetrance.
• Synthesis of evidence supporting genetic and environmental contributions to CHM etiology.

Main Results:

• A minority of CHM cases are attributed to monogenic mutations.
• Most CHM cases occur sporadically, suggesting complex inheritance patterns.
• The review consolidates information on various genetic mutation types (monogenic, susceptibility, somatic) involved in CHM.

Conclusions:

• The genetic etiology of most non-syndromic CHM is multifactorial, involving genetic and environmental risk factors.
• Understanding diverse genetic contributions, including somatic mutations, is crucial for CHM research.
• Further investigation into complex inheritance patterns is needed to elucidate CHM pathogenesis.