Abstract
We screened two human genomic libraries and isolated 14 different clones, designated λG1 and EG1-EG13, homologous to human glyceraldehyde-3-phosphate dehydrogenase (GAPD) cDNA. Subcloning and sequencing these recombinant phages led us to classify them as five different pseudogenes (ψG1–ψG5). All these sequences show such features typical of processed pseudogenes as numerous mutations, insertions, and deletions. The identity of numerous mutated sites among these pseudogenes and the presence of two Alu sequences flanking both ends of ψG1 suggest that GAPD pseudogenes originated from a unique reverse transcribed mRNA followed by gene duplication. The rate of nucleotide substitutions per site per year for known GAPD functional genes is low both for the synonymous substitutions (1.87×10−9) and for the nonsynonymous substitutions (0.12¢10−9) and indicates that the GAPD cDNA sequence is well conserved not only at the amino acid level, but also at the nucleotide level. The rate of nucleotide substitutions per site per year for GAPD pseudogenes shows a higher value (5.9×10−9) and suggests that these pseudogenes do not have any functional role.
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This work was supported by grants from the Consiglio Nazionale delle Ricerche and the Ministero Pubblica Istruzione (Rome, Italy). Special acknowledgment is given to the “Progetto Finalizzato Ingegneria Genetica e Basi Molecolari delle Malattie Ereditarie.”
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Arcari, P., Martinelli, R. & Salvatore, F. Human glyceraldehyde-3-phosphate dehydrogenase pseudogenes: Molecular evolution and a possible mechanism for amplification. Biochem Genet 27, 439–450 (1989). https://doi.org/10.1007/BF02399673
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DOI: https://doi.org/10.1007/BF02399673