Amino Acid Profile, Qn, Plasma (LabCorp)

Sarcosine

Optimal Result: 0 - 4 umol/L.

Sarcosine is also known as N-methylglycine. It is an intermediate and byproduct in the glycine synthesis and degradation. Sarcosine is metabolized to glycine by the enzyme sarcosine dehydrogenase, while glycine-N-methyl transferase generates sarcosine from glycine. It is an intermediate and byproduct in the glycine synthesis and degradation. Sarcosine is metabolized to glycine by the enzyme sarcosine dehydrogenase, while glycine-N-methyl transferase generates sarcosine from glycine. Sarcosine is a natural amino acid found in muscles and other body tissues. Sarcosine is found naturally as an intermediate in the metabolism of choline to glycine. Sarcosine is a competitive inhibitor of the type I glycine transporter (GlyT1), an N-methyl-D-aspartate receptor (NMDAR) co-agonist, and an important intermediate in one-carbon metabolism.

  • Its therapeutic potential for schizophrenia further underscores its clinical importance.
  • It is currently also being researched as a biomarker for prostate cancer [1234].

What does it mean if your Sarcosine result is too high?

  • Metabolism requires B2. May indicate functional B2 deficiency.
  • Suspect increased need for folic acid if: Elevated HOMOCYSTINE, SARCOSINE, glycine, serine, 1-methylhistidine, 3-methylhistidine, methionine, cystathionine or histidine.
  • Could also be Sarcosinemia, a rare autosomal recessive metabolic disorder. It can result from an inborn error of sarcosine metabolism, or from severe folate deficiency. It is thought to be a relatively benign condition.
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