Abstract
In the protozoan Stylonychia lemnae 10 different histone H3 genes were discovered by polymerase chain reaction (PCR) amplification and sequence analysis. One of them is interrupted by a short intron sequence. These genes code for nine divergent histone H3 proteins. The genetic distances between some of these variants are very high. Most of the substitutions, as well as insertions/deletions, were found in the amino-terminal region. One variant shows an extremely elongated and altered N-terminus, which did not allow an unambiguous alignment with other histone H3 variants in this region. Hybridization experiments using the different H3 genes as probes indicate that even more histone H3 variants must exist in this species.
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