COMT Variants are Associated With Breast and Nipple Pain.

Area of Science:

• Genetics
• Reproductive Health
• Pain Research

Background:

• Exclusive breastfeeding offers significant health benefits, yet rates remain low, with breast/nipple pain being a major barrier.
• While environmental factors are recognized, the role of maternal genetics in breastfeeding outcomes, particularly pain, is under-explored.
• Understanding genetic predispositions can offer novel insights into supporting breastfeeding mothers.

Purpose of the Study:

• To investigate the association between genetic variants in lactation-related genes and exclusive breastfeeding determinants.
• To identify specific single nucleotide polymorphisms (SNPs) in genes like PRLR, OXTR, COMT, and MFGE8 that may influence breastfeeding pain and outcomes.

Main Methods:

• Secondary analysis of a randomized controlled trial (NCT05262920) involving breastfeeding women.
• Examined SNPs in four candidate genes: PRLR, OXTR, COMT, and MFGE8.
• Assessed breast/nipple pain, perceived insufficient milk, and breastfeeding self-efficacy using validated scales.

Main Results:

• Single nucleotide polymorphisms (SNPs) within the catechol-O-methyltransferase (COMT) gene showed a significant association with breastfeeding-related outcomes.
• Carriers of minor alleles (T, A) for COMT rs4633 and rs4680 reported increased breast and nipple pain intensity compared to major allele homozygotes (C, G).
• This study is the first to link COMT gene variants to breast/nipple pain and its potential effect on breastfeeding exclusivity.

Conclusions:

• Genetic variations in the COMT gene, specifically rs4633 and rs4680, are associated with maternal breast and nipple pain.
• These findings suggest a genetic component influencing pain perception during breastfeeding, which may affect a mother's ability to breastfeed exclusively.
• Targeted genetic screening could potentially identify women at higher risk for pain, enabling proactive support strategies.