Abstract
A comparative study of the protein patterns in testes of wild-type and X/O flies of Drosophila hydei revealed quantitative differences in at least three major protein fractions. One protein component of a M r 155,000 fraction and a protein of M r 35,000 are completely absent in X/O testes. The amount of protein in a M r 55,000 fraction is considerably reduced. The tubulins, which are part of this fraction, are also reduced in amount. All three proteins were found as constituents of sperm tails. Studies of Y chromosomal mutants revealed that the presence of at least two of these proteins depends on the activity of loci O, P, and Q of the Y chromosome. However, preliminary evidence indicates an autosomal location of the genes of these sperm proteins. This suggests a regulatory role of Y chromosomal genes in the production of some major sperm proteins.
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