Abstract
Growth hormone-releasing hormone (GHRH) and pituitary adenylate cyclase activating polypeptide (PACAP) are two neuropeptides that are associated with the release of pituitary growth hormone. Here a cDNA of 2501 base pairs encoding both a PACAP and a GHRH-like peptide was isolated from a brain cDNA library made from Thai catfish ( Clarias macrocephalus). The organization is unlike that of the mammalian gene where PACAP and PACAP-related peptide (PRP) are encoded in one gene, and the GHRH peptide is on a separate gene. Northern analysis of catfish brain mRNA indicated that PACAP GHRH -like mRNA has three sizes; bands of 6000, 2500, and 1000 bases suggest alternative splicing of the gene. Reverse transcriptase/PCR assay detected PACAP GHRH -like mRNA in tissues from the brain, testis, ovary, and stomach, but not from the pancreas, pituitary, muscle, and liver. Our hypothesis that the two mammalian genes encoding GHRH or PACAP originated from a gene duplication between fish and tetrapods is supported by the present findings of similar mRNA organization and pattern of expression for the one fish gene and two mammalian genes.
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