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Updated: Dec 12, 2025
Functional Characterization of Endogenously Expressed Human RYR1 Variants
Published on: June 9, 2021
The molecular functions of RIT1 and its contribution to human disease
Richard Van1, Antonio Cuevas-Navarro1, Pau Castel1
1Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, CA, U.S.A.
Abstract:
RIT1 is a member of the Ras family of GTPases that direct broad cellular physiological responses through tightly controlled signaling networks. The canonical Ras GTPases are well-defined regulators of the RAF/MEK/ERK pathway and mutations in these are pathogenic in cancer and a class of developmental disorders termed RASopathies. Emerging clinical evidences have now demonstrated a role for RIT1 in RASopathies, namely Noonan syndrome, and various cancers including lung adenocarcinoma and myeloid malignancies. While RIT1 has been mostly described in the context of neuronal differentiation and survival, the mechanisms underlying aberrant RIT1-mediated signaling remain elusive. Here, we will review efforts undertaken to characterize the biochemical and functional properties of the RIT1 GTPase at the molecular, cellular, and organismal level, as well as provide a phenotypic overview of different human conditions caused by RIT1 mutations. Deeper understanding of RIT1 biological function and insight to its pathogenic mechanisms are imperative to developing effective therapeutic interventions for patients with RIT1-mutant Noonan syndrome and cancer.
Insights
Ras homolog ITP1 (RIT1) GTPase mutations are linked to Noonan syndrome and cancers. This review details RIT1
Area of Science:
- Molecular Biology
- Genetics
- Oncology
- Developmental Biology
Background:
- Ras GTPases regulate cellular signaling pathways, with mutations causing cancer and RASopathies.
- Emerging evidence implicates RIT1 in RASopathies, such as Noonan syndrome, and various cancers.
- RIT1's role in neuronal differentiation and survival is established, but its aberrant signaling mechanisms are unclear.
Purpose of the Study:
- To review the biochemical and functional properties of the RIT1 GTPase.
- To provide an overview of human conditions associated with RIT1 mutations.
- To elucidate RIT1's pathogenic mechanisms for therapeutic development.
Main Methods:
- Literature review of studies characterizing RIT1 at molecular, cellular, and organismal levels.
- Phenotypic analysis of human conditions linked to RIT1 mutations.
- Exploration of RIT1-mediated signaling pathways.
Main Results:
- RIT1 is a Ras family GTPase involved in critical cellular processes.
- RIT1 mutations are associated with Noonan syndrome and cancers like lung adenocarcinoma and myeloid malignancies.
- The precise molecular mechanisms of RIT1 in disease pathogenesis require further investigation.
Conclusions:
- Understanding RIT1's biological function and pathogenic mechanisms is crucial.
- Targeting RIT1 may offer therapeutic strategies for RIT1-mutant Noonan syndrome and cancers.
- Further research is needed to fully characterize RIT1's role in health and disease.
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