Methyltetrahydrofolate-homocysteine methyltransferase reductase gene and congenital heart defects in Down syndrome

  • Jadranka Vraneković University of Rijeka, Faculty of Medicine, Department of medical biology and genetics
  • Goran Slivšek University of Rijeka, School of Medicine, Department of Medical Biology and Genetics,
  • Dijana Majstorović University of Pula, Department of Natural and Health Sciences

Abstract

Congenital heart defects (CHD) are the most common abnormalities occurring in 40% -60% of Down syndrome (DS) patients. The 5-methyltetrahydrofolate homocysteine methyl transferase reductase (MTRR) is one of the key regulatory enzymes involved in folate pathway. Disrupted folate pathway due to MTRR polymorphism could be a risk factor for CHD in DS. The aim of the study was to determine the association between polymorphism MTRR 66A> G and CHD in DS. Additionally, the impact of maternal endogenous factors on CHD was analyzed, intake of folate through diet, periconceptional folic acid supplementation, smoking and alcohol drinking. A total of 155 children with DS and 148 their mothers have been enrolled in this study. Genotyping was performed by PCR-RFLP. The frequency of alleles and genotypes of MTRR 66A> G polymorphisms was not significantly different between a group with CHD compared to a group without CHD among DS subjects as well as in their mothers. The mothers with mutated homozygous genotypes who have taken folic acid preparations from the fourth week before pregnancy to eight weeks of pregnancy were more likely to have DS-CHD+ child. The study results suggested that maternal MTRR 66A> G polymorphisms associated with their lifestyle habits such as folic acid intake could altered individual risk for CHD in DS child.

Published
2020-06-23
How to Cite
VRANEKOVIĆ, Jadranka; SLIVŠEK, Goran; MAJSTOROVIĆ, Dijana. Methyltetrahydrofolate-homocysteine methyltransferase reductase gene and congenital heart defects in Down syndrome. Genetics & Applications, [S.l.], v. 4, n. 1, p. 12-17, june 2020. ISSN 2566-431X. Available at: <http://www.genapp.ba/index.php/genapp/article/view/110>. Date accessed: 04 aug. 2020. doi: https://doi.org/10.31383/ga.vol4iss1pp12-17.
Section
Research Articles