Methylenetetrahydrofolate Reductase (MTHFR) Gene Polymorphism and Infant's Anthropometry at Birth

Area of Science:

• Human Genetics
• Perinatal Epidemiology
• Nutritional Science

Background:

• Fetal growth and birth anthropometry are critical indicators of long-term health.
• Maternal MTHFR(677)C>T polymorphism is linked to birth weight, particularly with low folic acid intake.
• Understanding genetic influences on fetal development is crucial for disease risk prediction.

Purpose of the Study:

• To investigate the association between maternal MTHFR(677)C>T genetic polymorphism and newborn anthropometry.
• To examine this relationship in a population with sufficient folate consumption.
• To clarify the role of maternal genetics in fetal growth independent of folate status.

Main Methods:

• Prospective population-based birth cohort study (GENEIDA project) in Spain.
• Inclusion of 694 mother-newborn pairs.
• Maternal MTHFR(677)C>T single nucleotide polymorphism (SNP) genotyping using Q-PCR with TaqMan© probes.

Main Results:

• Maternal MTHFR(677)C>T genotype showed significant associations with newborn anthropometry.
• Specific genotypes (CT, CT/TT) correlated with increased/decreased risk of large-for-gestational-age (LGA) or small-for-gestational-age (SGA) for weight and height, varying by newborn sex.
• Associations with SGA in premature neonates were also observed.
• These relationships were evident despite adequate maternal folate intake.

Conclusions:

• Maternal MTHFR(677)C>T genotype is a significant factor influencing fetal growth and birth anthropometry.
• The genetic effect on newborn size persists even when maternal folate levels are sufficient.
• This highlights the complex interplay between maternal genetics and fetal development, independent of nutritional status.