The human S-adenosylmethionine decarboxylase gene: nucleotide sequence of a pseudogene and chromosomal localization of the active gene (AMD1) and the pseudogene (AMD2). 1995

S C Maric, and A Crozat, and J Louhimo, and S Knuutila, and O A Jänne
Department of Physiology, University of Helsinki, Finland.

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.

UI MeSH Term Description Entries
D008214 Lymphocytes White blood cells formed in the body's lymphoid tissue. The nucleus is round or ovoid with coarse, irregularly clumped chromatin while the cytoplasm is typically pale blue with azurophilic (if any) granules. Most lymphocytes can be classified as either T or B (with subpopulations of each), or NATURAL KILLER CELLS. Lymphoid Cells,Cell, Lymphoid,Cells, Lymphoid,Lymphocyte,Lymphoid Cell
D008969 Molecular Sequence Data Descriptions of specific amino acid, carbohydrate, or nucleotide sequences which have appeared in the published literature and/or are deposited in and maintained by databanks such as GENBANK, European Molecular Biology Laboratory (EMBL), National Biomedical Research Foundation (NBRF), or other sequence repositories. Sequence Data, Molecular,Molecular Sequencing Data,Data, Molecular Sequence,Data, Molecular Sequencing,Sequencing Data, Molecular
D011544 Pseudogenes Genes bearing close resemblance to known genes at different loci, but rendered non-functional by additions or deletions in structure that prevent normal transcription or translation. When lacking introns and containing a poly-A segment near the downstream end (as a result of reverse copying from processed nuclear RNA into double-stranded DNA), they are called processed genes. Genes, Processed,beta-Tubulin Pseudogene,Gene, Processed,Processed Gene,Processed Genes,Pseudogene,Pseudogene, beta-Tubulin,Pseudogenes, beta-Tubulin,beta Tubulin Pseudogene,beta-Tubulin Pseudogenes
D002874 Chromosome Mapping Any method used for determining the location of and relative distances between genes on a chromosome. Gene Mapping,Linkage Mapping,Genome Mapping,Chromosome Mappings,Gene Mappings,Genome Mappings,Linkage Mappings,Mapping, Chromosome,Mapping, Gene,Mapping, Genome,Mapping, Linkage,Mappings, Chromosome,Mappings, Gene,Mappings, Genome,Mappings, Linkage
D002896 Chromosomes, Human, Pair 6 A specific pair GROUP C CHROMSOMES of the human chromosome classification. Chromosome 6
D005796 Genes A category of nucleic acid sequences that function as units of heredity and which code for the basic instructions for the development, reproduction, and maintenance of organisms. Cistron,Gene,Genetic Materials,Cistrons,Genetic Material,Material, Genetic,Materials, Genetic
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D001483 Base Sequence The sequence of PURINES and PYRIMIDINES in nucleic acids and polynucleotides. It is also called nucleotide sequence. DNA Sequence,Nucleotide Sequence,RNA Sequence,DNA Sequences,Base Sequences,Nucleotide Sequences,RNA Sequences,Sequence, Base,Sequence, DNA,Sequence, Nucleotide,Sequence, RNA,Sequences, Base,Sequences, DNA,Sequences, Nucleotide,Sequences, RNA
D012437 Adenosylmethionine Decarboxylase An enzyme that catalyzes the decarboxylation of S-adenosyl-L-methionine to yield 5'-deoxy-(5'-),3-aminopropyl-(1), methylsulfonium salt. It is one of the enzymes responsible for the synthesis of spermidine from putrescine. EC 4.1.1.50. S-Adenosylmethionine Decarboxylase,Decarboxylase, Adenosylmethionine,Decarboxylase, S-Adenosylmethionine,S Adenosylmethionine Decarboxylase
D012689 Sequence Homology, Nucleic Acid The sequential correspondence of nucleotides in one nucleic acid molecule with those of another nucleic acid molecule. Sequence homology is an indication of the genetic relatedness of different organisms and gene function. Base Sequence Homology,Homologous Sequences, Nucleic Acid,Homologs, Nucleic Acid Sequence,Homology, Base Sequence,Homology, Nucleic Acid Sequence,Nucleic Acid Sequence Homologs,Nucleic Acid Sequence Homology,Sequence Homology, Base,Base Sequence Homologies,Homologies, Base Sequence,Sequence Homologies, Base

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