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- Title
Phylogenetic Distribution of CMP-Neu5Ac Hydroxylase (CMAH), the Enzyme Synthetizing the Proinflammatory Human Xenoantigen Neu5Gc.
- Authors
Peri, Sateesh; Kulkarni, Asmita; Feyertag, Felix; Berninsone, Patricia M.; Alvarez-Ponce, David
- Abstract
The enzyme CMP-N-acetylneuraminic acid hydroxylase (CMAH) is responsible for the synthesis of N-glycolylneuraminic acid (Neu5Gc), a sialic acid present on the cell surface proteins of most deuterostomes. The CMAH gene is thought to be present in most deuterostomes, but it has been inactivated in a number of lineages, including humans. The inability of humans to synthesize Neu5Gc has had several evolutionary and biomedical implications. Remarkably, Neu5Gc is a xenoantigen for humans, and consumption of Neu5Gc-containing foods, such as red meats, may promote inflammation, arthritis, and cancer. Likewise, xenotransplantation of organs producing Neu5Gc can result in inflammation and organ rejection. Therefore, knowing what animal species contain a functional CMAHgene, andare thus capable ofendogenousNeu5Gcsynthesis,has potentially far-reachingimplications. In addition to humans, other lineages are known, or suspected, to have lost CMAH; however, to date reports of absent and pseudogenicCMAHgenes are restricted to ahandful of species. Here, we analyze all available genomicdata for nondeuterostomes, and 322 deuterostome genomes, to ascertain the phylogenetic distribution of CMAH. Among nondeuterostomes,we found CMAH homologs in two green algae and a few prokaryotes. Within deuterostomes, putatively functional CMAH homologs are present in 184 of the studied genomes, and a total of 31 independent gene losses/pseudogenization events were inferred.Our work produces a list of animals inferred to be free from endogenous Neu5Gc based on the absence of CMAH homologs and are thus potential candidates for human consumption, xenotransplantation research, and model organisms for investigation of human diseases.
- Subjects
SIALIC acids; CELL membranes; PHYLOGENY; PSEUDOGENES; XENOGRAFTS
- Publication
Genome Biology & Evolution, 2018, Vol 10, Issue 1, p207
- ISSN
1759-6653
- Publication type
Article
- DOI
10.1093/gbe/evx251