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dif-1 and colt, both implicated in early embryonic development, encode carnitine acylcarnitine translocase
Nadia A Oey1, Lodewijk Ijlst, Carlo W T van Roermund
1Department of Pediatrics, Academic Medical Center, University of Amsterdam, Meibergdreef 9, 1105 AZ Amsterdam, The Netherlands.
Molecular Genetics and Metabolism
|May 18, 2005
Summary
Embryos can generate energy through fatty acid oxidation (FAO), challenging previous assumptions. Genes essential for embryonic development, dif-1 and colt, function as carnitine acylcarnitine carriers, supporting FAO during high energy demands.
Area of Science:
- Developmental Biology
- Metabolic Biochemistry
- Molecular Genetics
Background:
- Historically, embryonic and fetal energy generation was thought to rely solely on glycolysis.
- Recent findings indicate the presence and activity of fatty acid oxidation (FAO) enzymes in human embryos and fetuses.
- Two key embryonic differentiation genes, dif-1 and colt, are crucial for developmental stages with high energy needs.
Purpose of the Study:
- To investigate the role of FAO in embryonic development.
- To determine if dif-1 and colt genes are functional orthologs of the mitochondrial carnitine acylcarnitine carrier (CACT).
Main Methods:
- Searched for FAO gene expression during development.
- Identified dif-1 (Caenorhabditis elegans) and colt (Drosophila melanogaster) genes.
- Expressed dif-1 and colt in Saccharomyces cerevisiae.
- Assessed functional complementation of a yeast CACT deletion strain.
Main Results:
- DIF-1 and COLT proteins exhibit sequence similarity to CACT.
- DIF-1 and COLT functionally complemented a yeast CACT deletion strain.
- DIF-1 and COLT function as carnitine acylcarnitine transporters.
Conclusions:
- Embryos are capable of fatty acid oxidation, challenging prior assumptions.
- FAO is essential for early embryonic development due to high energy demands.
- DIF-1 and COLT are functional orthologs of CACT, facilitating FAO during development.