Summary
A 1.7-kbp DNA region from the 10.2-kb cluster containing the five rainbow trout histone genes has been subcloned in pBR322 and completely sequenced. It contains a trout histone H1 gene together with its 5′ and 3′ flanking sequences. This H1 gene codes for a H1 variant different from the major trout testis H1 previously sequenced by Macleod et al. (1977). Northern blots of total RNA from trout testis, kidney, and liver indicate that this H1 gene is expressed in all three tissues but that the level of H1 mRNA is much higher in testis than in other tissues. The lack of heterogeneity in the sizes and 5′ initiation sites of trout H1 mRNAs is surprising in view of the substantial heterogeneity of H1 variant proteins observed previously. The coding sequence of the H1 gene shows strong evidence of repeated partial duplications of a hexapeptide motif of the form Ala.Ala.Ala.Lys.Lys.Pro and of a pentapeptide phosphorylation-site sequence, Lys.Ser.Pro.Lys.Lys, during its evolution. Comparisons are drawn between this gene and the coding sequences of other vertebrate H1 genes from chicken andXenopus, and a strong homology is seen in the region of amino acids 22–101, which form the hydrophobic “head” of the H1 molecule. The 5′ and 3′ regulatory signals in the trout H1 are also compared with those of H1 genes from other sequences.
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Mezquita, J., Connor, W., Winkfein, R.J. et al. An H1 histone gene from rainbow trout (Salmo gairdnerii). J Mol Evol 21, 209–219 (1985). https://doi.org/10.1007/BF02102355
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DOI: https://doi.org/10.1007/BF02102355