The chicken genome contains no HMG1 retropseudogenes but a functional HMG1 gene with long introns.
We have cloned the genomic sequence coding for the high mobility group 1 (HMG1) protein in chickens. Multiple sequence alignment shows that the chicken HMG1 gene is highly homologous to the human and the mouse HMG1 genes. The gene structure of chicken HMG1 is similar to that of the mouse and the human HMG1 genes, with the same exon-intron boundaries. However, in contrast to other avian genes that have shorter introns, the chicken HMG1 gene has introns that are twice as long as their mammalian homologues. In addition to the functional, intron-containing HMG1 gene, all mammalian genomes contain more than 50 copies of HMG1 retropseudogenes each, while in the chicken genome there are no HMG1 retropseudogenes. This finding suggests that the HMG1 retropseudogenes arose in mammals after their divergence away from the birds.
Lum
H K
HK
Department of Applied Biology and Chemical, Technology, Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong.
Lee
K D
KD
Yu
G
G
D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002645:Chickens / Q000097:blood / Q000235:genetics*; D003001:Cloning, Molecular; D004247:DNA / Q000302:isolation & purification; D018076:DNA, Complementary / Q000737:chemistry; D016208:Databases, Factual; D016678:Genome; D006609:High Mobility Group Proteins / Q000235:genetics*; D006801:Humans; D007438:Introns; D008969:Molecular Sequence Data; D016133:Polymerase Chain Reaction; D011544:Pseudogenes; D016415:Sequence Alignment; D012689:Sequence Homology, Nucleic Acid
D018076:DNA, Complementary; D006609:High Mobility Group Proteins; D004247:DNA