Abstract
Histones were isolated from testis of the house cricket and analyzed by electrophoresis on polyacrylamide gels containing urea and acetic acid. Testes of two different nymphal instars and of adults were examined. The testes contained gonial and meiotic stages in the younger nymphs analyzed, and these same stages plus early spermatids in the older nymphs. At both nymphal instars, testis histone displayed the same five major fractions that are found in somatic nuclei of the cricket; the only unusual feature noted in nymph testis was a high abundance of phosphorylated F1. Adult testis has the same histone fractions as nymph testis and has two new fractions in addition. SDS electrophoresis also shows the presence of two more histones in adult testis than in nymph testis. — The unusual testis histones appear to accumulate during the nuclear elongation stages of spermiogenesis. The occurrence of these stages in adult testis is correlated with the presence of the extra histones. Nuclei of adult testis were separated into fractions enriched for early, mid, and late stages by velocity sedimentation at unit gravity. The unusual histones predominate in the fractions enriched for late spermiogenic stages. Both of the new histones appear to occur in the same stages of spermiogenesis, and display linked accumulation. Eventually they make up at least seventy percent of the histone complement.
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