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Chapter 12: Problem 33

What is the function of a splicing factor? Explain how splicing factors can regulate the cell-specific splicing of mRNAs.

Short Answer

Expert verified
A splicing factor is a component of the spliceosome responsible for removing introns from pre-mRNA and binding exons together. They regulate cell-specific splicing of mRNAs through alternative splicing, where their binding to specific sequences leads to the inclusion or exclusion of particular exons in different cell types. This results in different mRNA molecules being produced from the same primary RNA transcript.

Step by step solution

01

Understand the Function of Splicing Factors

Splicing factors are essential components of the spliceosome, the complex responsible for removing introns from pre-mRNA. Each splicing factor has a unique role to play in the mechanism of splicing. Some recognize specific sequences at the splice sites, while others aid in the removal or ligation of exons.
02

The Role of Splicing Factors in mRNA Processing

In mRNA processing, the introns (non-coding regions) are removed, and the exons (coding regions) are attached to form a mature mRNA molecule. Splicing factors are essential in this process as they recognize and bind to the splice sites 鈥� specific sequences at the ends of an intron. After the splicing factors have bound to the mRNA, other proteins in the spliceosome help carry out the actual splicing process (intron removal and exon ligation).
03

Cell-specific Splicing of mRNAs

Cell-specific splicing is when different cells within the same organism produce different mRNA molecules from the same primary RNA transcript. This is attained via alternative splicing, which allows a single gene to produce different protein variants. Here, the splicing factors play a regulatory role. Certain factors bind to unique sequences, leading to the inclusion or exclusion of specific exons in different cell types. This results in the production of functionally distinct proteins tailored to the needs of the specific cell.
04

Regulatory Role of Splicing Factors

Splicing factors regulate cell-specific splicing by interacting with specific sequences known as splicing enhancers or silencers on the pre-mRNA. This results in either the inclusion or exclusion of certain exons. As such, the splicing factors dictate the final mRNA product and hence, the protein that will be produced in a given cell, thus significantly influencing the cell's function.

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Most popular questions from this chapter

Describe the structure and function of a spliceosome. Speculate why the spliceosome subunits contain snRNA. In other words, what do you think is/are the functional role(s) of snRNA during splicing?

Discuss the differences between \(\rho\)-dependent and \(\rho\)-independent termination.

In Chapter 11, we discussed the function of DNA helicase, which is involved in DNA replication. Discuss how the functions of \(\rho\)-protein and DNA helicase are similar and how they are different.

A eukaryotic protein-encoding gene contains two introns and three exons: exon 1-intron 1-exon 2-intron 2-exon 3. The 5' splice site at the boundary between exon 2 and intron 2 has been eliminated by a small deletion in the gene. Describe how the pre-mRNA encoded by this mutant gene will be spliced. Indicate which introns and exons will be found in the mRNA after splicing occurs.

Describe the processing events that occur during the production of tRNA in E. coli.
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