Abstract
Sequence analysis of four chicken H1 histone genes described here completes the characterization of the full complement of six H1 genes in the chicken genome. Each of the six genes codes for a different H1 protein sequence, and these range in size from 217 to 224 amino acids. The proteins are distinct in sequence from the H1-related chicken H5 protein and appear to be analogous to the standard somatic mammalian H1 subtypes. The protein sequence data deduced from the genes represent the first complete set of vertebrate H1 protein sequences. Comparison of the chicken H1 gene noncoding sequences with each other and with H1 gene sequences from other organisms reveals conservation of an H1 gene-specific element, a G-rich element, and histone gene-specific 3' elements. Additional sequences are conserved between H1 genes of the chicken and other vertebrates. Comparisons also reveal variation in promoter and 3' elements between chicken genes that could play a role in the differential expression of H1 gene protein products.
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