Nuclear Folate Metabolism
Martha S Field1, Elena Kamynina1, James Chon2
1Division of Nutritional Sciences, Cornell University, Ithaca, New York 14853, USA;
Abstract:
Despite unequivocal evidence that folate deficiency increases risk for human pathologies, and that folic acid intake among women of childbearing age markedly decreases risk for birth defects, definitive evidence for a causal biochemical pathway linking folate to disease and birth defect etiology remains elusive. The de novo and salvage pathways for thymidylate synthesis translocate to the nucleus of mammalian cells during S- and G2/M-phases of the cell cycle and associate with the DNA replication and repair machinery, which limits uracil misincorporation into DNA and genome instability. There is increasing evidence that impairments in nuclear de novo thymidylate synthesis occur in many pathologies resulting from impairments in one-carbon metabolism. Understanding the roles and regulation of nuclear de novo thymidylate synthesis and its relationship to genome stability will increase our understanding of the fundamental mechanisms underlying folate- and vitamin B12-associated pathologies.
Insights
Folate deficiency increases disease risk, but the exact biochemical link is unclear. Nuclear thymidylate synthesis impacts genome stability and is crucial for understanding folate-related pathologies.
Area of Science:
- Biochemistry
- Molecular Biology
- Genetics
Background:
- Folate deficiency is linked to human pathologies and birth defects.
- The precise biochemical pathways connecting folate to disease etiology are not fully understood.
- Nuclear thymidylate synthesis plays a role in DNA replication and repair.
Purpose of the Study:
- To elucidate the causal biochemical pathway linking folate to disease and birth defect etiology.
- To understand the roles and regulation of nuclear de novo thymidylate synthesis.
- To explore the relationship between nuclear thymidylate synthesis, genome stability, and one-carbon metabolism.
Main Methods:
- Investigating the translocation of de novo and salvage pathways for thymidylate synthesis to the nucleus.
- Analyzing the association of these pathways with DNA replication and repair machinery.
- Examining impairments in nuclear de novo thymidylate synthesis in pathologies related to one-carbon metabolism.
Main Results:
- Nuclear translocation of thymidylate synthesis pathways limits uracil misincorporation into DNA.
- Impairments in nuclear de novo thymidylate synthesis are observed in various pathologies.
- These impairments are linked to disruptions in one-carbon metabolism.
Conclusions:
- Understanding nuclear de novo thymidylate synthesis is key to understanding folate-related diseases.
- The regulation of this pathway is critical for maintaining genome stability.
- Further research will illuminate mechanisms underlying folate- and vitamin B12-associated pathologies.
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