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Molecular and Cellular Biology, April 2002, p. 2267-2282, Vol. 22, No. 7
0270-7306/02/$04.00+0     DOI: 10.1128/MCB.22.7.2267-2282.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Developmental Control of Histone mRNA and dSLBP Synthesis during Drosophila Embryogenesis and the Role of dSLBP in Histone mRNA 3' End Processing In Vivo

David J. Lanzotti,1 Handan Kaygun,2 Xiao Yang,3 Robert J. Duronio,1,2,3,4* and William F. Marzluff1,2,3,4,5

Curriculum in Genetics and Molecular Biology,1 Department of Biology,2 Program in Molecular Biology and Biotechnology,3 Lineberger Comprehensive Cancer Center,4 Department of Biochemistry and Biophysics, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 275995

Received 23 October 2001/ Returned for modification 3 December 2001/ Accepted 17 December 2001

In metazoans, the 3' end of histone mRNA is not polyadenylated but instead ends with a stem-loop structure that is required for cell cycle-regulated expression. The sequence of the stem-loop in the Drosophila melanogaster histone H2b, H3, and H4 genes is identical to the consensus sequence of other metazoan histone mRNAs, but the sequence of the stem-loop in the D. melanogaster histone H2a and H1 genes is novel. dSLBP binds to these novel stem-loop sequences as well as the canonical stem-loop with similar affinity. Eggs derived from females containing a viable, hypomorphic mutation in dSLBP store greatly reduced amounts of all five histone mRNAs in the egg, indicating that dSLBP is required in the maternal germ line for production of each histone mRNA. Embryos deficient in zygotic dSLBP function accumulate poly(A)+ versions of all five histone mRNAs as a result of usage of polyadenylation signals located 3' of the stem-loop in each histone gene. Since the 3' ends of adjacent histone genes are close together, these polyadenylation signals may ensure the termination of transcription in order to prevent read-through into the next gene, which could possibly disrupt transcription or produce antisense histone mRNA that might trigger RNA interference. During early wild-type embryogenesis, ubiquitous zygotic histone gene transcription is activated at the end of the syncytial nuclear cycles during S phase of cycle 14, silenced during the subsequent G2 phase, and then reactivated near the end of that G2 phase in the well-described mitotic domain pattern. There is little or no dSLBP protein provided maternally in wild-type embryos, and zygotic expression of dSLBP is immediately required to process newly made histone pre-mRNA.

* Corresponding author. Mailing address: Department of Biology, Campus Box 3280, University of North Carolina, Chapel Hill, NC 27599. Phone: (919) 962-7749. Fax: (919) 962-8472. E-mail: duronio{at}med.unc.edu.

Molecular and Cellular Biology, April 2002, p. 2267-2282, Vol. 22, No. 7
0022-538X/02/$04.00+0     DOI: 10.1128/MCB.22.7.2267-2282.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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