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. 1983 Mar;80(5):1392–1396. doi: 10.1073/pnas.80.5.1392

Unusual structure of the chicken embryonic alpha-globin gene, pi'.

J D Engel, D J Rusling, K C McCune, J B Dodgson
PMCID: PMC393603  PMID: 6572397

Abstract

We report the DNA sequence of the globin locus encoding the chicken embryonic alpha-globin, pi'. The structure differs significantly from that of the two chicken adult alpha-globin genes, alpha A and alpha D, as well as from that of previously studied adult alpha-globin genes in that the introns of the pi' gene are substantially larger than those in adult alpha-globin loci. In contrast, the pi' introns are structurally similar to the only other expressed embryonic alpha-globin gene reported to date, the human zeta gene. While completing the sequence of the pi' gene, we determined that only one chromosomal locus within the chicken genome hybridizes to a pi' central exon probe. These data lead to the conclusion that if the equimolar chicken embryonic alpha-globin polypeptides, called pi and pi', are indeed independently transcribed, then that transcription occurs from alleles of the same gene; however, we favor the possibility that the pi gene does not actually exist. This conclusion is drawn from the observation that the two chromosomal alleles of embryonic alpha-globins (represented by recombinant bacteriophage lambda CaG5 and lambda CaG7) both encode pi'.

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Selected References

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