How does homocysteine affect pregnancy?

Homocysteine is an intermediate metabolite implicated in the risk of placenta-mediated complications, including preeclampsia, placental abruption, fetal growth restriction, and pregnancy loss. Large cohort and case-control studies have reported inconsistent associations between homocysteine and these complications.

What are the causes of increase of homocysteine level in pregnancy?

Hyperhomocysteinemia (HHct) is caused by numerous factors, such as genetic defects, lack of folic acid, vitamin B6 and B12 deficiency, hypothyroidism, drugs, aging, and renal dysfunction.

What is the precursor to homocysteine?

Homocysteine does not occur in the diet but it is an essential intermediate in normal mammalian metabolism of methionine. Each compound, methionine or homocysteine, is the precursor of the other. Methionine, (or homocysteine) metabolism is regulated by the disposition of homocysteine between these competing sequences.

What is methylation of homocysteine?

Homocysteine is a naturally occurring amino acid produced as part of the body’s methylation process. The level of homocysteine in the plasma is increasingly being recognised as a risk factor for disease and seen as a predictor of potential health problems such as cardiovascular disease and Alzheimer’s.

Can high homocysteine levels cause miscarriage?

Homocysteine is a type of amino acid that is naturally found in the body. At normal levels, it is not harmful, but elevated levels have been found to be associated with miscarriage as well as heart disease.

Does homocysteine affect fertility?

Conclusions: Serum homocysteine levels are inversely correlated with infertility. Homocysteine lowering agents have a favourable impact on the outcome of infertility and their use is suggested in cases of unexplained infertility associated with hyperhomocysteinemia.

Can low homocysteine levels cause miscarriage?

Homocysteine may aggravate the following pre-existing blood clotting disorders and further increase the risk of miscarriages.

How are folic acid vitamin b12 and homocysteine related?

Vitamin B12 deficiency, therefore, can lead to increased levels of serum methylmalonic acid. In the second reaction, homocysteine is converted to methionine by using vitamin B12 and folic acid as cofactors. In this reaction, a deficiency of vitamin B12 or folic acid may lead to increased homocysteine levels.

Which profile homocysteine can be used?

Therefore, hyperhomocysteinemia is a possible risk factor for coronary artery disease. Coronary artery disease occurs when an atherosclerotic plaque blocks blood flow to the coronary arteries, which supply the heart with oxygenated blood….Homocysteine.

How are folic acid vitamin B12 and homocysteine related?

How can I lower my homocysteine during pregnancy?

In this study, we demonstrated that daily folic acid intake with either doses of 0.5 mg or 5 mg throughout pregnancy significantly reduced the plasma levels of Hcy.

What happens if homocysteine is high during pregnancy?

In humans, elevated plasma homocysteine concentrations are associated with common pregnancy complications and adverse outcomes, including preeclampsia, spontaneous abortion, placental abruption, and recurrent pregnancy loss ( 20 ). Extreme elevation of homocysteine may also be associated with neural tube defects ( 21 ).

How is methionine metabolized during pregnancy?

During pregnancy, methionine continues to be metabolized by a series of metabolic pathways that have the nonprotein amino acid homocysteine as a central component ( Fig. 1 ). By acquiring a methyl group from either methylated folates or from betaine (derived from choline), homocysteine is converted back to methionine, completing the cycle.

How does pregnancy affect choline flux through the Sam pool?

In rats there is a depletion of choline pools during pregnancy ( 19 ), suggesting that the choline requirement is significantly increased during gestation. The impact of these changing requirements on the flux through the SAM pool is unclear.

What is the role of uterine fluid in the pathophysiology of methionine toxicity?

The uterine fluid is derived from the circulation, so the embryo derives some protection from the adverse effects of excess dietary methionine by the metabolic processes that maintain circulating concentrations.