Pre-mRNA splicing and its cotranscriptional connections

Area of Science:

• Molecular Biology
• Gene Expression
• RNA Processing

Background:

• Eukaryotic gene transcription by RNA polymerase II (Pol II) produces pre-mRNAs containing introns that require splicing.
• Splicing is a crucial post-transcriptional modification essential for generating mature messenger RNA (mRNA).
• The spliceosome, a dynamic ribonucleoprotein complex, catalyzes the splicing reaction.

Purpose of the Study:

• To review recent advancements in understanding the linkage between splicing and transcription.
• To explore the functional coupling of splicing with other cotranscriptional RNA processing events.
• To highlight the efficiency of cotranscriptional splicing.

Main Methods:

• Review of recent scientific literature and experimental evidence.
• Analysis of the molecular mechanisms connecting transcription and splicing.
• Investigation of the role of the transcription elongation complex.

Main Results:

• A significant portion of splicing occurs concurrently with transcription (cotranscriptionally).
• Cotranscriptional splicing, occurring as RNA is extruded from Pol II at high speeds (up to 5 kb/minute), is more efficient.
• Tethering splicing to the transcription elongation complex enables functional coupling.

Conclusions:

• Splicing is intricately linked to transcript elongation, often occurring cotranscriptionally.
• This linkage facilitates functional coupling between splicing and transcription.
• A network of connections links splicing to other cotranscriptional RNA processing events, optimizing gene expression.