Version 5.4
| Homo sapiens Gene: CMAHP | |||||||||||||||||
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| Summary | |||||||||||||||||
| InnateDB Gene | IDBG-66062.6 | ||||||||||||||||
| Last Modified | 2014-10-13 [Report errors or provide feedback] | ||||||||||||||||
| Gene Symbol | CMAHP | ||||||||||||||||
| Gene Name | cytidine monophospho-N-acetylneuraminic acid hydroxylase, pseudogene | ||||||||||||||||
| Synonyms | CMAH; CSAH | ||||||||||||||||
| Species | Homo sapiens | ||||||||||||||||
| Ensembl Gene | ENSG00000168405 | ||||||||||||||||
| Encoded Proteins | |||||||||||||||||
| Protein Structure | |||||||||||||||||
| Useful resources | Stemformatics EHFPI ImmGen | ||||||||||||||||
| Entrez Gene | |||||||||||||||||
| Summary |
Sialic acids are terminal components of the carbohydrate chains of glycoconjugates involved in ligand-receptor, cell-cell, and cell-pathogen interactions. The two most common forms of sialic acid found in mammalian cells are N-acetylneuraminic acid (Neu5Ac) and its hydroxylated derivative, N-glycolylneuraminic acid (Neu5Gc). Studies of sialic acid distribution show that Neu5Gc is not detectable in normal human tissues although it was an abundant sialic acid in other mammals. Neu5Gc is, in actuality, immunogenic in humans. The absense of Neu5Gc in humans is due to a deletion within the human gene CMAH encoding cytidine monophosphate-N-acetylneuraminic acid hydroxylase, an enzyme responsible for Neu5Gc biosynthesis. Sequences encoding the mouse, pig, and chimpanzee hydroxylase enzymes were obtained by cDNA cloning and found to be highly homologous. However, the homologous human cDNA differs from these cDNAs by a 92-bp deletion in the 5\' region. This deletion, corresponding to exon 6 of the mouse hydroxylase gene, causes a frameshift mutation and premature termination of the polypeptide chain in human. It seems unlikely that the truncated human hydroxylase mRNA encodes for an active enzyme explaining why Neu5Gc is undetectable in normal human tissues. Human genomic DNA also shows evidence of this deletion which does not occur in the genomes of African great apes. Nonetheless, the CMAH gene maps to 6p21.32 in humans and great apes indicating that mutation of the CMAH gene occurred following human divergence from chimpanzees and bonobos. [provided by RefSeq, Jul 2008] |
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| Gene Information | |||||||||||||||||
| Type | unitary_pseudogene | ||||||||||||||||
| Genomic Location | Chromosome 6:25081068-25166555 | ||||||||||||||||
| Strand | Reverse strand | ||||||||||||||||
| Band | p22.3 | ||||||||||||||||
| Transcripts |
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| Interactions | |||||||||||||||||
| Number of Interactions |
This gene and/or its encoded proteins are associated with 0 experimentally validated interaction(s) in this database.
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| Orthologs | |||||||||||||||||
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Species
Mus musculus
Bos taurus
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Gene ID
Gene Order
Not yet available
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| Cross-References | |||||||||||||||||
| SwissProt | |||||||||||||||||
| TrEMBL | |||||||||||||||||
| UniProt Splice Variant | |||||||||||||||||
| Entrez Gene | |||||||||||||||||
| UniGene | Hs.594465 | ||||||||||||||||
| RefSeq | |||||||||||||||||
| HUGO | |||||||||||||||||
| OMIM | |||||||||||||||||
| CCDS | |||||||||||||||||
| HPRD | |||||||||||||||||
| IMGT | |||||||||||||||||
| EMBL | |||||||||||||||||
| GenPept | |||||||||||||||||
| RNA Seq Atlas | |||||||||||||||||