TERT-RMRP complex GO:1990572: Genes, Functions & Methods

The TERT-RMRP complex (GO:1990572) is a cellular component defined as a ribonucleoprotein complex that possesses RNA-directed RNA polymerase (RdRP) activity and is composed of telomerase reverse transcriptase (TERT) and the non-coding RNA component of mitochondrial RNA processing endoribonuclease (RMRP). This complex represents a convergence of telomerase biology and mitochondrial RNA metabolism, two fields traditionally studied in isolation. Understanding its composition and function is critical because both TERT and RMRP have been independently linked to cancer, aging, and developmental disorders. The complex provides a mechanistic link between telomere maintenance and mitochondrial RNA processing, offering new avenues for therapeutic intervention. Researchers studying this complex need robust tools to manipulate its components and assess downstream effects on cellular physiology.

The TERT-RMRP complex is a ribonucleoprotein assembly that contains the protein TERT and the non-coding RNA RMRP. It is defined by its RNA-directed RNA polymerase (RdRP) activity, meaning it can synthesize RNA using an RNA template. This complex is distinct from the canonical telomerase holoenzyme, which uses TERT with TERC RNA to extend telomeres. Instead, the TERT-RMRP complex couples TERT to RMRP RNA, linking telomerase function to mitochondrial RNA processing and broader RNA metabolism.

The TERT-RMRP complex is important because it bridges two fundamental cellular processes: telomere maintenance and mitochondrial RNA processing. TERT is well known for its role in telomerase, but its association with RMRP RNA reveals a non-canonical function in RNA-directed RNA synthesis. This complex has been implicated in cancer and aging, where telomerase reactivation and mitochondrial dysfunction are hallmarks. Understanding its regulation and function may uncover new therapeutic targets for age-related diseases and cancer.

The TERT-RMRP complex involves key genes and RNAs that are central to its function and regulation.

The TERT-RMRP complex is regulated at multiple levels, including TERT expression, RMRP RNA abundance, and post-translational modifications. TERT is transcriptionally regulated by oncogenes and tumor suppressors, while RMRP RNA levels are controlled by RNA polymerase III and processing factors. The assembly of the complex may be influenced by cellular stress, mitochondrial function, and telomere status. Further research is needed to fully elucidate the regulatory mechanisms.

TERT is reactivated in most cancers to maintain telomeres, and RMRP has been implicated in cancer cell proliferation. The TERT-RMRP complex may contribute to oncogenesis through its RdRP activity or by modulating mitochondrial RNA processing. Targeting this complex could offer new therapeutic strategies.

Telomere shortening and mitochondrial dysfunction are hallmarks of aging. The TERT-RMRP complex links these processes, and its dysregulation may accelerate aging. Understanding its role could lead to interventions for age-related diseases.

Mutations in RMRP cause cartilage-hair hypoplasia, a ribosomopathy characterized by short stature, hair hypoplasia, and immune deficiency. The TERT-RMRP complex may be affected by these mutations, contributing to disease pathology.

RIP can identify RNAs associated with TERT, including RMRP, confirming complex formation. This method is useful for studying the TERT-RMRP complex in various cell types.

In vitro RdRP assays using recombinant TERT and RMRP RNA can measure the complex's catalytic activity. These assays help dissect the mechanism of RNA synthesis.

Genome-wide CRISPR screens can identify genes that regulate the TERT-RMRP complex or are synthetic lethal with its components. This approach is powerful for uncovering novel pathways.

Mass spectrometry-based proteomics can identify proteins that interact with TERT or RMRP, providing insights into the complex's composition and regulation.

Researchers studying TERT-RMRP complex-related genes often need to determine whether a candidate gene is causally involved in complex assembly, RNA-directed RNA polymerase activity, or downstream cellular phenotypes. EDITGENE provides a comprehensive suite of CRISPR-based services to accelerate this research.

The TERT-RMRP complex (GO:1990572) is a unique ribonucleoprotein that bridges telomerase biology and mitochondrial RNA processing. Its RNA-directed RNA polymerase activity and disease associations make it a compelling target for cancer and aging research. Leveraging CRISPR-based models and bioinformatics, researchers can dissect its assembly, regulation, and downstream effects. EDITGENE offers comprehensive services to support these investigations.