Mutation spectrum of congenital heart disease in a consanguineous Turkish population

Weilai Dong, Hande Kaymakcalan, Sheng Chih Jin, Nicholas S. Diab, Cansaran Tanıdır, Ali Seyfi Yalim Yalcin, A. Gulhan Ercan-Sencicek, Shrikant Mane, Murat Gunel, Richard P. Lifton, Kaya Bilguvar, Martina Brueckner

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Backgrounds: While many studies agree that consanguinity increases the rate of congenital heart disease (CHD), few genome analyses have been conducted with consanguineous CHD cohorts. Methods: We recruited 73 CHD probands from consanguineous families in Turkey and used whole-exome sequencing (WES) to identify genetic lesions in these patients. Results: On average, each patient had 6.95 rare damaging homozygous variants, 0.68 of which are loss-of-function (LoF) variants. Seven patients (9.6%) carried damaging homozygous variants in five causal CHD genes. Six of those patients exhibited laterality defects (six HTX and one D-TGA). Three additional patients (4.1%) harbored other types of CHD-associated genomic alterations, which overall explained 13.7% (10/73) of the cohort. The contribution from recessive variants in our cohort is higher than 1.8% reported from a cohort of 2871 CHD subjects where 5.6% of subjects met the criteria for consanguinity. Conclusions: Our WES screen of a Turkish consanguineous population with structural CHD revealed its unique genetic architecture. Six of seven damaging homozygous variants in CHD causal genes occur in the setting of laterality defects implies a strong contribution from consanguinity to these defects specifically. Our study thus provided valuable information about the genetic landscape of CHD in consanguineous families in Turkey.

Original languageEnglish
Article numbere1944
JournalMolecular Genetics and Genomic Medicine
Volume10
Issue number6
DOIs
StatePublished - Jun 2022

Keywords

  • congenital heart disease
  • consanguinity
  • genetics
  • mutation

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