Single copy gene for the chicken non-histone chromosomal protein HMG-17.
A chicken genomic library was screened with the human cDNA encoding the non-histone chromosomal protein HMG-17 and a 4565-base pair fragment containing the entire gene encoding this protein was isolated and characterized. Sequence analysis of the fragment revealed that from the start to end of transcription, the HMG-17 gene is 3293 base pairs long and is comprised of 6 exons ranging in size from 30 to 890 base pairs. Upstream of the putative cap site are both a CAAT box and a TATA box as well as several Sp1 binding sites. The gene has an extremely high content of G and C residues (75%) in a 1150-base pair fragment starting 500 base pairs from the putative cap site. This region satisfies the definition of an HpaII tiny fragment island. Southern analysis indicated that there is a single copy of this gene in chickens, whereas Northern analysis revealed that a single transcript is being synthesized from this gene. A comparison of the chicken and human cDNA and protein sequences and subsequent calculation of the evolutionary rates indicated that HMG-17 is a slowly evolving gene. The present article, which is the first study on the isolation and characterization of a complete gene coding for a high mobility group non-histone protein, indicates that the gene has features characteristic of housekeeping genes.
Landsman
D
D
Laboratory of Molecular Carcinogenesis, National Cancer Institute, Bethesda, Maryland 20892.
Srikantha
T
T
Bustin
M
M
D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002645:Chickens; D004247:DNA / Q000235:genetics; D004262:DNA Restriction Enzymes; D005796:Genes; D006609:High Mobility Group Proteins / Q000235:genetics*; D006801:Humans; D008969:Molecular Sequence Data; D012689:Sequence Homology, Nucleic Acid; D013045:Species Specificity
D006609:High Mobility Group Proteins; D004247:DNA; D004262:DNA Restriction Enzymes