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J. Biol. Chem., Vol. 260, Issue 30, 16263-16268, 12, 1985

Testis-specific histone H1t is antigenically distinct among H1 subtypes

ER Markose and MR Rao

Histone H1t has been purified from rat testes and antibodies were elicited in rabbits. Immunoblotting studies with anti-histone H1t-IgG have shown that it reacted specifically with histone H1t but not with other histone H1 subtypes, namely H1a, -b, -c, -d, -e and H10. The anti- histone H1t-IgG also did not react with chicken erythrocyte histone H5. Immunoblotting studies have also revealed that the polyclonal anti- histone H1t-IgG reacted with (a) two polypeptide fragments, NBS-N and NBS-C, derived from N-bromosuccinimide cleavage of histone H1t, (b) two polypeptide fragments, CT-N and CT-C, derived from alpha-chymotrypsin cleavage of histone H1t, and (c) GH1t, globular domain of histone H1t obtained after trypsin cleavage. The indirect immunofluorescence studies on nuclei isolated from adult rat testes with anti-histone H1t- IgG showed that the fluorescence, particularly, of the pachytene nucleus was the brightest. On the other hand, anti-histone H1t-IgG did not stain nuclei from either liver or nuclei isolated from the testes of 10-day-old rats.
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