title: Human delta-aminolevulinate dehydratase: chromosomal localization to 9q34 by in situ hybridization.
abstract: The structural gene for human delta-aminolevulinate dehydratase (ALA-D) has been localized to chromosomal region 9q34 by in situ hybridization using a [125I]-labeled human delta-aminolevulinate dehydratase cDNA. Of the 150 silver grains analyzed, 25% were localized to chromosome 9q, while 12% and 8% were on chromosomes 1p and 13q, respectively. The single chromosomal region q34 had over 90% of the total grains observed on chromosome 9. In contrast, the grains on chromosomes 1p and 13q were dispersed, consistent with the absence of any human ALA-D pseudogenes. Southern blot analysis of somatic cell hybrids informative for ALA-D (Wang et al. 1985) also was consistent and supported the finding of only one locus for this heme biosynthetic enzyme.
mesh_terms: D002871:Chromosome Banding; D002874:Chromosome Mapping; D002899:Chromosomes, Human, Pair 9; D004247:DNA / Q000235:genetics; D004262:DNA Restriction Enzymes; D015246:Deoxyribonuclease EcoRI; D005796:Genes; D006801:Humans; D007621:Karyotyping; D009693:Nucleic Acid Hybridization; D000623:Porphobilinogen Synthase / Q000235:genetics*
chemical_list: D004247:DNA; D004262:DNA Restriction Enzymes; D015246:Deoxyribonuclease EcoRI; D000623:Porphobilinogen Synthase