Recurrent GNAQ mutation encoding T96S in natural killer/T cell lymphoma

Area of Science:

• Oncology
• Molecular Genetics
• Immunology

Background:

• Natural killer/T cell lymphoma (NKTCL) is an aggressive malignancy with unclear molecular underpinnings.
• NKTCL has a higher prevalence in Asian and South American populations.

Purpose of the Study:

• To investigate the molecular genetic mechanisms of NKTCL.
• To identify specific genetic alterations contributing to NKTCL pathogenesis.

Main Methods:

• Whole-exome and targeted deep sequencing were employed to identify somatic mutations in NKTCL patients.
• Conditional knockout mice (Ncr1-Cre-Gnaq^fl/fl) were used to study the function of GNAQ in vivo.

Main Results:

• Somatic mutations in GNAQ, specifically T96S alteration of Gαq protein, were identified in 8.7% of NKTCL patients.
• Gαq deficiency enhanced natural killer (NK) cell survival and suppressed NKTCL tumor growth by inhibiting AKT and MAPK signaling pathways.
• The GNAQ T96S mutant appeared to promote tumor growth, and patients with these mutations showed poorer survival.

Conclusions:

• Recurrent somatic GNAQ T96S mutations are identified as potential contributors to NKTCL pathogenesis.
• These findings enhance the understanding of NKTCL genetic mechanisms.
• The study suggests GNAQ mutations as potential therapeutic targets for NKTCL.