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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

The human S-adenosylmethionine decarboxylase gene: nucleotide sequence of a pseudogene and chromosomal localization of the active gene (AMD1) and the pseudogene (AMD2).

S-adenosylmethionine decarboxylase (AdoMet-DC) is a key enzyme in polyamine biosynthesis. The human genome contains at least two loci for the AdoMetDC gene (AMD), one of which (AMD1) has previously been mapped to chromosome 6 and the other (AMD2) to the X chromosome. The locus on chromosome 6 is the transcriptionally active gene. We now report characterization of the AMD2 locus (GenBank Accession No. U02035) on the X chromosome, which contains sequences that cross-hybridize with human AdoMetDC cDNA. This DNA lacks all of the introns present in AMD1 and has numerous mutations in the protein-coding region. Its overall nucleotide sequence identity with AdoMetDC cDNA is about 90%. AMD2 is therefore a processed pseudogene, which, because of multiple mutations, cannot be translated to an active AdoMetDC enzyme, even if it were transcribed. Chromosomal loci for human AMD sequences were determined by in situ hybridization to metaphase chromosomes, with genomic DNAs from the active gene and the pseudogene loci as probes. AMD1 was localized to chromosome region 6q21-->q22 and AMD2 to band Xq28.[1]

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