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The region of pSV2neo that encompasses the simian virus 40 early polyadenylylation signal was replaced with a DNA fragment that spans the 3' end of a sea urchin (Psammechinus miliaris) histone H2A gene. This clone, pMK2.H2A(3'), was used to transfect COS cells. RNA analysis revealed that transcripts from pMK2.H2A(3') were polyadenylylated at a site 85 nucleotides downstream from the expected 3' end of mature H2A mRNA. Nucleotide sequencing showed that the site of poly(A) addition was located 10 nucleotides downstream from a cluster of four A-A-U-A-A-A sequences. The lower accumulation of MK2.H2A(3') mRNA, which was 5-10% that of SV2neo mRNA, suggests that the H2A polyadenylylation signal is relatively inefficient. The relationship of the above findings to the 3' end processing of other histone mRNAs is discussed.

Polyadenylylation of sea urchin histone RNA sequences in transfected COS cells.