Recurrent Mutations in the MTOR Regulator RRAGC in Follicular Lymphoma.

Clinical cancer research : an official journal of the American Association for Cancer Research (2016-11-03)
Zhang Xiao Ying, Meiyan Jin, Luke F Peterson, Denzil Bernard, Kamlai Saiya-Cork, Mehmet Yildiz, Shaomeng Wang, Mark S Kaminski, Alfred E Chang, Daniel J Klionsky, Sami N Malek

This study was performed to further our understanding of the biological and genetic basis of follicular lymphoma and to identify potential novel therapy targets. We analyzed previously generated whole exome sequencing data of 23 follicular lymphoma cases and one transformed follicular lymphoma case and expanded findings to a combined total of 125 follicular lymphoma/3 transformed follicular lymphoma. We modeled the three-dimensional location of RRAGC-associated hotspot mutations. We performed functional studies on novel RRAGC mutants in stable retrovirally transduced HEK293T cells, stable lentivirally transduced lymphoma cell lines, and in Saccharomyces cerevisiae RESULTS: We report recurrent mutations, including multiple amino acid hotspots, in the small G-protein RRAGC, which is part of a protein complex that signals intracellular amino acid concentrations to MTOR, in 9.4% of follicular lymphoma cases. Mutations in RRAGC distinctly clustered on one protein surface area surrounding the GTP/GDP-binding sites. Mutated RRAGC proteins demonstrated increased binding to RPTOR (raptor) and substantially decreased interactions with the product of the tumor suppressor gene FLCN (folliculin). In stable retrovirally transfected 293T cells, cultured in the presence or absence of leucine, multiple RRAGC mutations demonstrated elevated MTOR activation as evidenced by increased RPS6KB/S6-kinase phosphorylation. Similar activation phenotypes were uncovered in yeast engineered to express mutations in the RRAGC homolog Gtr2 and in multiple lymphoma cell lines expressing HA-tagged RRAGC-mutant proteins. Our discovery of activating mutations in RRAGC in approximately 10% of follicular lymphoma provides the mechanistic rationale to study mutational MTOR activation and MTOR inhibition as a potential novel actionable therapeutic target in follicular lymphoma. Clin Cancer Res; 22(21); 5383-93. ©2016 AACR.

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Product Description

Protease Inhibitor Cocktail, for use with mammalian cell and tissue extracts, DMSO solution
Phosphatase Inhibitor Cocktail 3, DMSO solution
Ethylenediaminetetraacetic acid disodium salt dihydrate, reagent grade, 98.5-101.5% (titration)
Monoclonal Anti-HA−Agarose antibody produced in mouse, clone HA-7, purified immunoglobulin, PBS suspension
Sodium orthovanadate, 99.98% trace metals basis
RPMI-1640 Medium, With L-glutamine and sodium bicarbonate. Without arginine, leucine, lysine, and phenol red, liquid, sterile-filtered, suitable for cell culture, designed for isotope labeling for cell culture applications
Anti-Raptor Antibody, clone 1H6.2, clone 1H6.2, from mouse