Alternative splicing of TAF6: downstream transcriptome impacts and upstream RNA splice control elements

Area of Science:

• Molecular Biology
• Cell Biology
• Genetics

Background:

• The TAF6δ pathway regulates apoptosis, a crucial cellular process for life-or-death decisions.
• TAF6δ, a pro-apoptotic subunit of the TFIID transcription factor, is induced during apoptosis.
• Alternative splicing of TAF6δ is critical for initiating apoptosis, but the regulatory mechanisms remain unclear.

Purpose of the Study:

• To elucidate the mechanisms governing TAF6δ alternative splicing.
• To define the distinct transcriptome profiles driven by TAF6δ gain-of-function versus TAF6α loss-of-function.
• To identify cis-acting RNA elements and structural features that regulate TAF6δ splicing.

Main Methods:

• Comparative microarray analysis to compare transcriptomes.
• Mutational analysis of a TAF6 minigene system to study splicing.
• RNA structure probing techniques (implied).

Main Results:

• TAF6δ induces a unique transcriptome profile, distinct from TAF6α depletion.
• Several novel RNA elements that modulate TAF6δ splicing were identified.
• RNA secondary structure plays a significant role in TAF6δ alternative splicing selection.

Conclusions:

• The study reveals novel regulatory elements and structural mechanisms controlling TAF6δ alternative splicing.
• Understanding TAF6δ splicing is key to understanding its role in apoptosis and cancer.
• Distinct transcriptomic outcomes result from TAF6δ gain versus TAF6α loss.