MTRR (gene)

MTRR (gene)

The MTRR gene encodes the enzyme methionine synthase reductase, which is crucial for the methionine and folate cycles. This enzyme is involved in the regeneration of methionine synthase, an enzyme that catalyzes the conversion of homocysteine to methionine, using vitamin B12 as a cofactor.

Diagram of folate transport and metabolism

Function

Methionine synthase reductase, the product of the MTRR gene, plays a vital role in maintaining the activity of methionine synthase. Methionine synthase requires periodic reactivation by methionine synthase reductase, which uses NADPH as an electron donor to reduce the cob(II)alamin form of vitamin B12 to methylcobalamin, the active form required for methionine synthesis.

Genetic Variants

Variants in the MTRR gene can lead to disruptions in the methionine and folate cycles, potentially resulting in elevated levels of homocysteine, a condition known as hyperhomocysteinemia. This condition is associated with an increased risk of cardiovascular disease, neural tube defects, and other health issues.

Clinical Significance

The MTRR gene is of clinical interest due to its role in homocysteine metabolism. Genetic testing for MTRR variants can be useful in assessing the risk of conditions related to impaired folate metabolism. Additionally, understanding the function of MTRR can aid in the development of therapeutic strategies for managing hyperhomocysteinemia and related disorders.

Related pages

• Methionine synthase
• Folate metabolism
• Vitamin B12
• Homocysteine