Reference Detail

Ref Type

Journal Article

PMID

(21821710)

Authors

Elliott NE, Cleveland SM, Grann V, Janik J, Waldmann TA, Davé UP

Title

FERM domain mutations induce gain of function in JAK3 in adult T-cell leukemia/lymphoma.

Journal	Vol	Issue	Date	Pages	Journal Short Title
Blood	118	14	2011 Oct 06	3911-21	Blood

URL

Abstract Text

Adult T-cell leukemia/lymphoma (ATLL) is an incurable disease where most patients succumb within the first year of diagnosis. Both standard chemotherapy regimens and mAbs directed against ATLL tumor markers do not alter this aggressive clinical course. Therapeutic development would be facilitated by the discovery of genes and pathways that drive or initiate ATLL, but so far amenable drug targets have not been forthcoming. Because the IL-2 signaling pathway plays a prominent role in ATLL pathogenesis, mutational analysis of pathway components should yield interesting results. In this study, we focused on JAK3, the nonreceptor tyrosine kinase that signals from the IL-2R, where activating mutations have been found in diverse neoplasms. We screened 36 ATLL patients and 24 ethnically matched controls and found 4 patients with mutations in JAK3. These somatic, missense mutations occurred in the N-terminal FERM (founding members: band 4.1, ezrin, radixin, and moesin) domain and induced gain of function in JAK3. Importantly, we show that these mutant JAK3s are inhibited with a specific kinase inhibitor already in human clinical testing. Our findings underscore the importance of this pathway in ATLL development and offer a therapeutic handle for this incurable cancer.

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Molecular Profile	Treatment Approach

Gene Name	Source	Synonyms	Protein Domains	Gene Description	Gene Role

Therapy Name	Drugs	Efficacy Evidence	Clinical Trials

Drug Name	Trade Name	Synonyms	Drug Classes	Drug Description

Gene	Variant	Impact	Protein Effect	Variant Description
JAK3	E183G	missense	gain of function	JAK3 E183G lies within the FERM domain of the Jak3 protein (UniProt.org). E183G confers a gain of function to the Jak3 protein as demonstrated by increased protein stability compared to wild-type, increased Stat5a phosphorylation, and transformation in cultured cells (PMID: 21821710).
JAK3	L156P	missense	gain of function	JAK3 L156P lies within the FERM domain of the Jak3 protein (UniProt.org). L156P results in a gain of function of the Jak3 protein as demonstrated by increased protein stability and transformation in cell culture (PMID: 21821710).
JAK3	R172Q	missense	gain of function	JAK3 R172Q lies within the FERM domain of the Jak3 protein (UniProt.org). R172Q confers a gain of function to the Jak3 protein as demonstrated by constitutive autophosphorylation of Jak3 and increased phosphorylation of Stat5a, and is transforming in cultured cells (PMID: 21821710).

Molecular Profile	Indication/Tumor Type	Response Type	Therapy Name	Approval Status	Evidence Type	Efficacy Evidence	References
JAK3 E183G	Advanced Solid Tumor	sensitive	Tofacitinib	Preclinical - Cell culture	Actionable	In a preclinical study, transformed human cells expressing JAK3 E183G in culture demonstrated decreased cell survival, increased G1 arrest, elevated apoptotic activity, and reduced phosphorylation of Stat5a when treated with Xeljanz (tofacitinib) (PMID: 21821710).	21821710
JAK3 R172Q	Advanced Solid Tumor	sensitive	Tofacitinib	Preclinical - Cell culture	Actionable	In a preclinical study, transformed human cells expressing JAK3 R172Q in culture demonstrated decreased cell survival, reduced phosphorylation of Stat5a, and G1 arrest when treated with Xeljanz (tofacitinib) (PMID: 21821710).	21821710
JAK3 A572V	Advanced Solid Tumor	sensitive	Tofacitinib	Preclinical - Cell culture	Actionable	In a preclinical study, transformed human cells expressing JAK3 A572V in culture demonstrated decreased cell survival, increased G1 arrest, elevated apoptotic activity, and reduced phosphorylation of Stat5a when treated with Xeljanz (tofacitinib) (PMID: 21821710).	21821710
JAK3 L156P	Advanced Solid Tumor	sensitive	Tofacitinib	Preclinical - Cell culture	Actionable	In a preclinical study, transformed human cells expressing JAK3 L156P in culture demonstrated decreased cell survival, increased G1 arrest, and reduced phosphorylation of Stat5a when treated with Xeljanz (tofacitinib) (PMID: 21821710).	21821710