Development, Vol 106, Issue 2 367-373, Copyright © 1989 by Company of Biologists

JOURNAL ARTICLES

Poly(A) shortening accompanies the activation of translation of five mRNAs during spermiogenesis in the mouse

KC Kleene
Department of Biology, University of Massachusetts, Boston 02125.

I have compared the quantity and the length of the poly(A) tracts of five haploid-expressed mRNAs in the polysomal and nonpolysomal fractions of round and elongating spermatids in mice: transition proteins 1 and 2, protamines 1 and 2, and an unidentified mRNA of about 1050 bases. Postmitochondrial supernatants of highly enriched populations of round and elongating spermatids (early and late haploid spermatogenic cells) were sedimented on sucrose gradients, and the size and amount of each mRNA in gradient fractions were analyzed in Northern blots. In round spermatids, all five mRNAs are restricted to the postpolysomal fractions, but in elongating spermatids about 30-40% of each mRNA is associated with the polysomes. The distribution of these mRNAs in sucrose gradients suggests that all five mRNAs are stored in a translationally repressed state in round and early elongating spermatids, and that they become translationally active in middle and late elongating spermatids. The translationally repressed forms of all five mRNAs are long and homogenous in size, whereas the polysomal forms are shorter and more heterogenous due to shortening of their poly(A) tracts. The relationship between translational activity and poly(A) size exemplified by these five mRNAs may be typical of mRNAs which are translationally repressed in round spermatids and translationally active in elongating spermatids.
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