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Nucleic Acids Research, 1983, Vol. 11, No. 10 3301-3315
© 1983


MOLECULAR BIOLOGY

Glyceraldehyde 3-phosphate dehydrogenase protein and mRNA are both differentially expressed in adult chickens but not chick embryos

Robert J Millner, MaryAnn D. Brow*, Don W. Cleveland+, Thomas M. Shinick* and J.Gregor Sutclffe*

AV Davis Center for Behavioral Neurobiology, The Salk Inst San Diego, CA 92138 *Committee for the study of Molecular Genetics Research Inst., Scripps Clinic La Jolla, CA 92037 +Dept. Physiological chemistry Johns Hopkins Sch. Medicine Baltimore, MD 21205, USA

Received November 23, 1983. Revised April 18, 1983. Accepted April 18, 1983.

We have determined the 679 nucleotide sequence of a cDNA clone which, by hybridization-translation experiments, corresponds to a 36K chick brain protein. Our studies provide a partial amino add sequence for this protein, identifying it as chicken glyceraldehyde-3-phosphate dehydrogenase (GAPDH). Antisera raised against purified chicken GAPDH reacted with a 36K protein present in chick brain extracts and estimated to be the fourth most prevalent protein, as determined by either Coomassie Blue staining or by in vitro translation of chick brain mRNA. The amounts of GAPDH mRNA 1n chick brain, liver and muscle and adult chicken brain are similar, whereas the relative amount of adult chicken muscle GAPDH mRNA is greatly elevated and that of adult liver lowered. The GAPDH protein levels showed a similar variation between tissues, suggesting that the levels of GAPDH protein are largely regulated by the amount of available GAPDH mRNA. The chicken GAPDH clone does not hybridize to rat mRNA, even though GAPDH is one of the most evolu-tionarily conserved proteins, indicating that selection pressures are heavier at the primary protein sequence level than at the nucleic acid sequence level for this gene, a situation contrasting to that of the tubulins


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