MALAT1 regulates mRNA processing through sequence dependent RNA-RNA and RNA-protein interactions

Area of Science:

• Molecular Biology
• Genetics
• RNA Biology

Background:

• Messenger RNAs (mRNAs) exhibit diverse transcripts and proteins due to complex gene expression regulation.
• The human genome encodes a vast array of proteins from a limited number of genes.

Purpose of the Study:

• To investigate the regulatory role of the metastasis-associated lung adenocarcinoma transcript 1 (MALAT1) non-coding RNA in mRNA processing.
• To elucidate the mechanisms of MALAT1-mediated regulation of alternative splicing.

Main Methods:

• Analysis of direct RNA-RNA and RNA-protein interactions involving MALAT1.
• Investigating the impact of MALAT1 on the binding affinity of TAR DNA binding protein (TDP-43) to SAT1 pre-mRNA.
• Examining MALAT1's role in the alternative splicing of SAT1 and PPFIA3 pre-mRNAs.

Main Results:

• MALAT1 directly interacts with TDP-43 and SAT1 pre-mRNA, enhancing SAT1 alternative splicing.
• Tripartite RNA-RNA-protein interactions involving MALAT1, TDP-43, and SAT1 increase TDP-43 binding to SAT1 pre-mRNA.
• MALAT1 also enhances PPFIA3 pre-mRNA alternative splicing through sequence-specific interactions.

Conclusions:

• The MALAT1 non-coding RNA plays a significant role in regulating mRNA processing and alternative splicing.
• MALAT1 possesses modular binding regions for RNA-RNA and RNA-protein interactions, facilitating mRNA processing.
• This regulatory mechanism is crucial for mRNA transcripts involved in neuronal function.