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SMAD1 Loss-of-Function Variant Responsible for Congenital Heart Disease

Zhi Wang1, Xiao-Hui Qiao1, Ying-Jia Xu2

  • 1Department of Pediatric Internal Medicine, Ningbo Women & Children's Hospital, Ningbo 315031, China.

Biomed Research International
|March 14, 2022
PubMed

Insights

A new genetic cause for congenital heart disease (CHD) was identified. A SMAD1 gene variation disrupts heart development, offering insights for genetic risk assessment and prevention.

Area of Science:

  • Cardiovascular Genetics
  • Developmental Biology
  • Human Genetics

Background:

  • Congenital heart disease (CHD) is a major global health issue with a significant genetic component.
  • Over 100 genes are linked to CHD, yet its genetic basis remains incompletely understood.
  • Autosomal-dominant inheritance patterns are observed in some familial CHD cases.

Purpose of the Study:

  • To identify novel genetic factors contributing to autosomal-dominant congenital heart disease (CHD).
  • To investigate the functional impact of a newly identified SMAD1 gene variation in CHD pathogenesis.
  • To explore the role of SMAD1 in the transcriptional regulation of known CHD-related genes.

Main Methods:

  • Whole-exome sequencing was performed on a four-generation family with autosomal-dominant CHD.
  • A heterozygous SMAD1 variant (c.264C>A; p.Tyr88*) was identified and validated using Sanger sequencing.
  • Dual-luciferase reporter gene assays were conducted to assess SMAD1's transactivation activity.

Main Results:

  • A truncating SMAD1 variation (Tyr88*) cosegregated with CHD in the affected family and was absent in controls.
  • The Tyr88* SMAD1 mutation impaired the transactivation of TBX20 and NKX2.5.
  • The mutation abolished the synergistic transcriptional activation between SMAD1 and MYOCD.

Conclusions:

  • SMAD1 is identified as a novel gene associated with congenital heart disease (CHD).
  • The findings elucidate a new genetic mechanism in CHD development involving SMAD1.
  • This discovery has implications for genetic risk assessment and antenatal prevention strategies for families with CHD.

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