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Mol Cell Biol. 1985 November; 5(11): 3108-3115

Chromosomal organization of chicken histone genes: preferred associations and inverted duplications.

R J D'Andrea, L S Coles, C Lesnikowski, L Tabe and J R Wells

ABSTRACT

We present a detailed picture of the disposition of core and H1 histone genes in the chicken genome. Forty-two genes were located within four nonoverlapping regions totalling approximately 175 kilobases and covered by three cosmid clones and a number of lambda clones. The genes for the tissue-specific H5 histone and other variant histones were not found in these regions. The longest continuous region mapped was 67 kilobases and contained 21 histone genes in five dissimilar clusters. No long-range repeat was evident, but there were preferred associations, such as H1 genes with paired, divergently transcribed H2A-H2B genes and H3-H4 associations. However, there were exceptions, and even when associations such as H1-H2A-H2B we maintained, the order of those genes within a cluster may not have been. Another feature was the presence of three (unrelated) clusters in which genes were symmetrically ordered around central H3 genes; in one such cluster, the boundaries of a duplicated H2A-H4 gene pair contained related repeat sequences. Despite the dispersed nature of chicken histone genes, the number of each type was approximately equal, being represented as follows: 6 H1, 10 H2A, 8 H2B, 10 H3, and 8 H4.

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Mol Cell Biol. 1985 November; 5(11): 3108-3115

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