rs3818762

This deep sequencing study of the MTHFR gene identified variants associated with myelomeningocele (a neural tube defect) in 96 affected subjects (49 Caucasian, 47 Mexican American). The authors discovered one novel intronic splice site variant (c.171+3G>T) and found seven SNPs with significant allele frequency differences compared to ethnically matched reference populations (p ≤ 0.05, Fisher's exact test), including five SNPs (rs13306561, rs2274976, rs2066462, rs12121543, rs1476413) not previously associated with neural tube defects.

This pharmacogenetics study analyzed 28 SNPs in methotrexate (MTX) metabolism genes (SLC19A1/RFC1, ABCB1, FPGS, GGH) in two Spanish populations with rheumatoid arthritis (n=124 and n=194). Key findings: FPGS rs10987742 and rs10106 associated with MTX response (p=0.033, p=0.041); FPGS rs10106 also associated with MTX survival (p=0.005) and toxicity (p=0.021); ABCB1 rs868755, rs10280623, rs1858923 associated with toxicity (p=0.025, p=0.048, p=0.031). In the first study, MTHFR rs17421511 (p=0.024) and rs1476413 (p=0.0086) associated with response, DHFR rs1643650 (p=0.026) associated with response, ATIC rs16853826 associated with toxicity (p=0.039).