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Phenylalanine hydroxylase (PAH) and tyrosine hydroxylase (TH) are consecutive enzymes in the metabolic pathway leading to the production of catecholamine neurotransmitters. A comparison of recently available sequence data of these enzymes in the rat indicates about 70% homology in the 3' coding regions. We have localized TH by in situ hybridization to human chromosome region 11p15. Consideration of this assignment and that of PAH to chromosome 12, together with the known distribution of other pairs of related genes on these two chromosomes, provides convincing evidence of their ancestral relationship and suggests a role for gene duplication in the diversification of metabolic pathways in the vertebrate ancestors of mammals.

Original publication

DOI

10.1159/000132246

Type

Journal article

Journal

Cytogenet Cell Genet

Publication Date

1986

Volume

42

Pages

29 - 32

Keywords

Animals, Biological Evolution, Cells, Cultured, Chromosome Mapping, Chromosomes, Human, 6-12 and X, Female, Gene Amplification, Genes, Genetic Linkage, Genetic Markers, Humans, Hybrid Cells, Lymphocytes, Male, Mice, Nucleic Acid Hybridization, Tyrosine 3-Monooxygenase