Alternative splicing is required for stage differentiation in malaria parasites

Area of Science:

• Molecular Biology
• Parasitology
• Evolutionary Biology

Background:

• Alternative splicing is key for tissue differentiation in multicellular organisms.
• Unicellular protists differentiate into various cell types but the role of alternative splicing is unknown.
• Investigating alternative splicing in protists can reveal insights into cell differentiation mechanisms.

Purpose of the Study:

• To determine if alternative splicing influences cellular differentiation in unicellular protists.
• To compare alternative splicing patterns between different life stages of the malaria parasite Plasmodium berghei.
• To understand the role of alternative splicing in sex-specific differentiation.

Main Methods:

• RNA sequencing (RNA-seq) was used to analyze splicing in Plasmodium berghei.
• Comparative analysis of splicing in asexual, female, and male sexual stages.
• Investigated the impact of disrupting an alternative splicing factor (PbSR-MG).

Main Results:

• Extensive alternative splicing changes were observed between different parasite stages.
• Alternative splicing plays a significant role in sexual differentiation of gametocytes.
• Disruption of PbSR-MG impaired sex-specific splicing and parasite differentiation.

Conclusions:

• Alternative splicing is reprogrammed during cellular differentiation in unicellular protists.
• Alternative splicing regulates stage-specific gene expression and cellular identity.
• This regulatory mechanism evolved early in eukaryotic evolution and is vital for parasite transmission.