As suggested above and in figure 1, the methionine cycle and the transsulfuration pathway influence homocysteine concentration and for this reason they are important research targets: The formation of methionine from homocysteine is essential to reduce the risk of homocysteine toxicity, conserve methionine as a substrate for protein synthesis, and produce a principle methylating agent in the form of SAM
PMID 25024695
Some patients in edge cases may still be reviewed individually
LangSFairfiedBGaoBDuanYZhangXFoutsDEet al
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Psychoneuroendocrinology , 38(8), 12591270