Extranuclear Histones in Teleost Gills: An Evolutionary Study

摘要

Extranuclear histones and histone fragments (13-15 kDa) in gill microsomes of a phylogenetic series of teleostean fishes (tilapia, trout, carp, eel and elephant fish) were studied. Histones H2A and H2B are the first occurring of these antimicrobial agents. Halfway the evolution of teleosts (carp, trout) H3 fragments emerge, which disappear in later stages of development and are replaced by truncated H1 (tilapia). The hypothesis is forwarded that variation in composition of extranuclear histones is caused by changes in specificity of histone transporters.