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Synergistic interactions between two distinct elements of a regulated splicing enhancer
1Department of Molecular and Cellular Biology, Harvard University, Cambridge, Massachusetts 02138.
Genes & Development
|February 1, 1995
Summary
This study identifies a purine-rich enhancer (PRE) within the doublesex (dsx) repeat element, crucial for dsx pre-mRNA splicing regulation. The PRE, along with repeat sequences, requires Transformer (Tra) and Transformer 2 (Tra2) for proper assembly of regulatory protein complexes.
Area of Science:
- Molecular Biology
- Genetics
- RNA Splicing
Background:
- Alternative splicing of doublesex (dsx) pre-mRNA is essential for sexual development.
- The dsx repeat element (dsxRE) contains six 13-nucleotide repeats and is known to regulate dsx splicing.
- Transformer (Tra), Transformer 2 (Tra2), and SR proteins are implicated in dsxRE activity.
Purpose of the Study:
- To identify functional elements within the dsxRE involved in alternative splicing regulation.
- To elucidate the roles of Transformer (Tra) and Transformer 2 (Tra2) in dsx pre-mRNA splicing.
- To understand the cooperative binding of splicing factors on enhancer elements.
Main Methods:
- Identification of a purine-rich enhancer (PRE) sequence within the dsxRE.
- Functional analysis of the PRE and its synergy with repeat sequences.
- In vitro binding assays to study protein-RNA interactions.
Main Results:
- A novel purine-rich enhancer (PRE) sequence was identified within the dsxRE.
- The PRE functionally synergizes with the repeat sequences of the dsxRE.
- The PRE is essential for specific binding of Transformer 2 (Tra2) to the dsxRE.
- Transformer (Tra) and SR proteins bind cooperatively to the dsxRE, irrespective of the PRE's presence.
Conclusions:
- Positive regulation of dsx pre-mRNA splicing depends on the assembly of a multiprotein complex on at least two distinct enhancer elements.
- The Transformer (Tra) and Transformer 2 (Tra2) proteins play critical, cooperative roles in this complex assembly.
- The interplay between the PRE, repeat sequences, and splicing factors (Tra, Tra2, SR proteins) dictates precise alternative splicing of dsx pre-mRNA.