The Claim
Genetic variants in the MCM6 gene, particularly the C/T-13910 SNP, are associated with age-dependent accumulation of DNA methylation at regulatory regions near the lactase gene, where the C allele correlates with progressive epigenetic silencing and declining lactase mRNA levels, while the T allele is linked to reduced methylation and sustained expression, indicating that lactase non-persistence is driven by genotype-specific epigenetic aging rather than fixed genetic determination.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
In adults, a specific genetic variation near the lactase gene leads to increasing DNA methylation over time, which reduces lactase production in individuals with the C allele but not in those with the T allele, resulting in lifelong lactase expression only in T allele carriers.
See the scientific wording
In adult humans, genetic variants in the MCM6 gene, particularly the C/T-13910 SNP, are associated with age-dependent accumulation of DNA methylation at regulatory regions near the lactase gene, where the C allele correlates with progressive epigenetic silencing and declining lactase mRNA levels, while the T allele is linked to reduced methylation and sustained expression, suggesting that lactase non-persistence is driven by genotype-specific epigenetic aging rather than fixed genetic determination.
People with the C version of a specific gene switch turn off their milk-digesting gene as they get older because chemical tags build up on their DNA and block the switches that keep the gene active. People with the T version keep those switches open, so their milk-digesting gene stays on for life.
What the research says
1 studyStudy: Lactase non-persistence is directed by DNA variation-dependent epigenetic aging
People with a certain version of the gene (C allele) develop more chemical tags on their DNA as they age, which turns off the lactase gene and makes them unable to digest milk. People with the other version (T allele) don’t get as many tags, so they keep digesting milk into adulthood.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.