Gm6377, also named TASL2, is involved in the TLR7/9-mediated innate immune response pathway. It plays a role in mediating IRF5-dependent antiviral responses and autoimmunity, and is thus of significance in the context of antimicrobial immunity and autoimmune conditions like systemic lupus erythematosus (SLE) [2].

In the study of multiple myeloma (MM), Gm6377 was found to have differential expression levels. B cells expressed high levels of Gm6377 mRNA, while PCs and the mus musculus myeloma SP 2/0 cells had low levels. Overexpression of Gm6377 suppressed SP 2/0 cell proliferation and tumor progression in the xenograft mouse model by reducing the activation of the Myc promoter, suggesting its potential as a therapeutic target for MM [1]. In relation to TLR7/9-mediated immune responses, double knockout of TASL and Gm6377 (TASLDKO) phenocopied SLC15A4-deficient mice, showing comparable impairment of innate and humoral responses. TASLDKO mice failed to control chronic LCMV infection but were protected in a pristane-induced SLE disease model, demonstrating the critical pathophysiological role of Gm6377 in TLR7/9-driven inflammatory responses [2].

In conclusion, Gm6377 has diverse functions. In the context of MM, it can suppress tumor cell growth by modulating Myc activation. In the immune system, it is crucial for TLR7/9-driven inflammatory responses. Studies using gene knockout models, especially in mice, have revealed its roles in these specific disease-related biological processes, providing potential therapeutic implications for MM and SLE [1,2].

References:

1. Zhai, B, Hou, C, Xu, R, Han, G, Wang, R. 2020. Gm6377 suppressed SP 2/0 xenograft tumor by down-regulating Myc transcription. In Clinical & translational oncology : official publication of the Federation of Spanish Oncology Societies and of the National Cancer Institute of Mexico, 22, 1463-1471. doi:10.1007/s12094-019-02280-y. https://pubmed.ncbi.nlm.nih.gov/31950438/

2. Drobek, Ales, Bernaleau, Léa, Delacrétaz, Maeva, Marquis, Julien, Rebsamen, Manuele. 2025. The TLR7/9 adaptors TASL and TASL2 mediate IRF5-dependent antiviral responses and autoimmunity in mouse. In Nature communications, 16, 967. doi:10.1038/s41467-024-55692-y. https://pubmed.ncbi.nlm.nih.gov/39856058/