Finding the right RNA: identification of cellular mRNA substrates for RNA-binding proteins

Area of Science:

• Molecular Biology
• Genetics
• Biochemistry

Background:

• Defects in RNA-binding proteins are linked to human genetic disorders.
• Identifying specific mRNA substrates for these proteins is crucial for understanding their function.
• Current methods face challenges in isolating these mRNA targets.

Purpose of the Study:

• To introduce and validate a novel technique, SNAAP, for identifying mRNA substrates of RNA-binding proteins.
• To demonstrate the feasibility of SNAAP using alphaCP1 and K562 cell components.
• To explore the potential of SNAAP in understanding RNA-binding protein functions in disease.

Main Methods:

• The isolation of specific nucleic acids associated with proteins (SNAAP) technique was developed.
• Glutathione-S-transferase (GST) tagged RNA-binding proteins were immobilized to isolate associated mRNAs.
• Differential display assay was used to identify bound mRNAs, with interactions optimized in cellular extracts.

Main Results:

• SNAAP successfully identified specific mRNA targets associated with the RNA-binding protein alphaCP1.
• Two specific mRNAs identified were TAPA-1 and cytochrome c oxidase subunit II (coxII).
• Specific binding sites on TAPA-1 and coxII 3' UTRs were confirmed for alphaCP1.

Conclusions:

• The SNAAP technique is feasible and effective for identifying mRNA targets of RNA-binding proteins.
• SNAAP has broad applicability for studying clinically relevant RNA-binding proteins and their roles in disease.
• This approach provides insights into the functions of RNA-binding proteins implicated in genetic disorders.