credit to: https://www.geneticlifehacks.com/mthfr/
rs1801133
- G/G: typical
- A/G: one copy of MTHFR C677T allele (heterozygous), decreased by 40%
- A/A: two copies of MTHFR C677T (homozygous), decreased by 70 – 80%
rs1801131
- T/T: typical
- G/T: one copy of MTHFR A1298C (heterozygous), slightly decreased enzyme function
- G/G: two copies of MTHFR A1298C (homozygous), decreased enzyme by about 20%
