Polysome Profiling in Leishmania, Human Cells and Mouse Testis

Area of Science:

• Molecular Biology
• Cell Biology
• Genetics

Background:

• Gene expression studies traditionally focused on transcription, but mRNA levels don't always correlate with protein production.
• Protein translation regulation is crucial for cell function and implicated in various human diseases, including cancer and neurodegeneration.
• Polysome profiling is an effective technique for assessing mRNA translational status and genome-wide translation.

Purpose of the Study:

• To develop and validate a universal polysome profiling protocol applicable to diverse biological samples.
• To adapt the polysome profiling method for different cellular and tissue contexts, including suspension cells, adherent cells, and animal tissues.
• To provide a robust method for studying translational regulation in various organisms and disease models.

Main Methods:

• Developed a universal polysome profiling protocol involving sucrose gradient centrifugation of cytoplasmic lysates.
• Validated the protocol across three distinct models: the parasite Leishmania major, cultured human cells, and mouse testis tissue.
• Included methods for analyzing polysomal fractions: RT-qPCR for mRNA, Western blot for proteins, and electrophoresis for ribosomal RNA.

Main Results:

• Successfully adapted the polysome profiling technique for suspension cells, adherent cells, and animal tissues.
• Demonstrated the protocol's versatility in analyzing translational regulation across different biological models.
• Established a foundation for further advanced analyses, such as transcriptome-wide mRNA profiling (RNA-seq) and proteomic analysis of ribosome-associated proteins.

Conclusions:

• The presented universal polysome profiling protocol is adaptable and effective for studying translational control in diverse biological systems.
• This method provides valuable insights into post-transcriptional gene regulation, crucial for understanding normal cell function and disease pathogenesis.
• The protocol can be readily modified for other biological models, facilitating broader research into translational regulation.