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Folate and vitamin B12.

J M Scott1

  • 1Department of Biochemistry, Trinity College, Dublin 2, Republic of Ireland. jscott@tcd.ie

The Proceedings of the Nutrition Society
|August 31, 1999
PubMed
Summary

Folate deficiency impairs DNA synthesis, causing anemia. Vitamin B12 deficiency can mimic folate deficiency by trapping folate cofactors, also leading to anemia and potential neurological issues.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Nutritional Science

Background:

  • Folates, including tetrahydrofolate, are crucial for one-carbon metabolism.
  • Active folate cofactors are essential for purine and pyrimidine biosynthesis, impacting DNA synthesis.
  • Folate metabolism is closely linked with vitamin B12 in the methylation cycle.

Purpose of the Study:

  • To elucidate the biochemical roles of folate cofactors in cellular metabolism.
  • To explain the mechanisms by which folate deficiency causes anemia.
  • To describe the interrelationship between folate and vitamin B12 metabolism and their impact on cell division and neurological function.

Main Methods:

  • Biochemical pathway analysis of folate metabolism.
  • Description of enzymatic reactions involving folate cofactors.
  • Comparison of clinical manifestations of folate and vitamin B12 deficiencies.

Main Results:

  • Tetrahydrofolate derivatives serve as C1 donors for purine synthesis.
  • Folate cofactors are essential for converting RNA pyrimidine bases to DNA thymine.
  • Folate deficiency leads to reduced DNA synthesis, resulting in anemia.
  • Vitamin B12 deficiency can trap folate cofactors as 5-methyltetrahydrofolate, causing a pseudo-folate deficiency and similar anemia.

Conclusions:

  • Folate is indispensable for DNA and red blood cell synthesis.
  • Disruptions in the methylation cycle, whether due to folate or vitamin B12 deficiency, have significant cellular consequences.
  • Vitamin B12 deficiency can present with anemia and neurological symptoms due to impaired folate metabolism.

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