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Histone H5 messenger RNA is polyadenylated
Nature
|January 31, 1980
Summary
Histone mRNA typically lacks a poly(A) tail and is DNA synthesis-dependent. However, amphibian oocyte histone mRNA is polyadenylated, and H5 mRNA is also polyadenylated, challenging these established norms.
Area of Science:
- Molecular Biology
- Gene Expression
- Biochemistry
Background:
- Histone mRNA usually lacks a 3' poly(A) sequence, unlike most mRNAs.
- Histone synthesis is typically coupled to DNA replication.
- Exceptions exist, such as histone synthesis in amphibian oocytes without DNA replication.
Purpose of the Study:
- To investigate the polyadenylation status of histone mRNA in specific biological contexts.
- To explore the atypical synthesis of Histone H5 in red blood cell maturation.
Main Methods:
- Analysis of mRNA polyadenylation in amphibian oocytes.
- Investigation of Histone H5 mRNA polyadenylation in erythrocytes.
Main Results:
- Most histone mRNA in amphibian oocytes is polyadenylated.
- Polyadenylation of Histone H5 mRNA was confirmed.
- The poly(A) tail on histone mRNA is likely removed during oocyte maturation.
Conclusions:
- Histone mRNA polyadenylation is not universally absent and occurs in specific developmental stages.
- Histone H5 mRNA exhibits polyadenylation, further distinguishing its expression.
- These findings suggest alternative regulatory mechanisms for histone mRNA processing and translation.