XB-ART-30920Nucleic Acids Res November 11, 1981; 9 (21): 5737-46.
Histone gene number in relation to C-value in amphibians.
We have compared the number of copies of sequences complementary to a cloned Xenopus histone H4 coding sequence in the genomes of Xenopus, Triturus and Ambystoma, amphibian species with widely different C-values (3, 23 and 38pg DNA/haploid genome respectively). Quantitative autoradiography indicates that H4 sequence constitute a greater proportion of the genome the larger that genome is. Measurement of the absolute copy-number by reassociation kinetic analysis indicated 47 +/- 10, 636 +/- 21 2685 +/- 349 copies per haploid genome each in Xenopus, Triturus and Ambystoma respectively. Whilst this confirms a trend of increasing copy-number with increasing C-value, the two are not directly proportional and some other factors must contribute to determining the number of copies of these genes.
PubMed ID: 7312628
PMC ID: PMC327557
Article link: Nucleic Acids Res
Genes referenced: h4c4
References [+] :
Bachmann, Feulgen slope determinations of urodele nuclear DNA amounts. 1970, Pubmed