Btnl9-flox Mouse

Btnl9, or butyrophilin-like protein 9, is a member of the immunoglobulin families. It has been implicated in immune-related and cancer-related pathways [1]. Functional enrichment analyses suggest its involvement in various biological processes relevant to disease mechanisms.

In multiple cancer types, studies have shown significant associations. In thyroid cancer (THCA), BTNL9 expression is down-regulated, related to tumor stages, immune cell infiltrations, and prognosis, with lower expression associated with a poorer progression-free interval (PFI) [1]. In breast cancer, its down-regulation is common, and ectopic expression inhibits cell proliferation, colony formation, and metastasis, while inducing apoptosis, acting via the P53/CDC25C and P53/GADD45 pathways [2]. In non-small-cell lung cancer, lncRNA CALML3-AS1 drives cancer progression by epigenetically repressing BTNL9 [3]. In uveal melanoma, high BTNL9 expression is associated with a favorable prognosis, and it can suppress invasion [4]. In lung adenocarcinoma, its down-regulation is linked to a poor overall survival probability, and it is positively correlated with immune-related scores and immune cell infiltration levels [5]. In pancreatic cancer, decreased BTNL9 expression is associated with a reduced survival rate [6]. In BRAF-mutated peritoneal metastasis from colorectal cancer, increased expression of BTNL9 is observed [7].

In idiopathic pulmonary fibrosis, BTNL9 is down-regulated, and it may have a protective effect by inhibiting extracellular matrix production and promoting wound repair [8]. In ALS, a negative correlation between BTNL9 and ALS risk was identified through Mendelian randomization analysis [9].

In conclusion, BTNL9 appears to play diverse roles in multiple diseases, especially in various cancers and potentially in neurodegenerative and fibrotic diseases. Its down-regulation is often associated with poor prognosis in cancer, and it is involved in regulating cell proliferation, metastasis, and immune-related processes. These findings from different disease-based studies contribute to understanding its biological functions and potential as a biomarker or therapeutic target.