ArticleeLife2024
Fam49b dampens TCR signal strength to regulate survival of positively selected thymocytes and peripheral T cells.
Article in eLife, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
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Who cites it
3 citing papers in PubMed.
- The Deubiquitinating Enzyme USP9X Regulates the Protein Stability of the FAM49B in Clear Cell Renal Cell Carcinoma.Journal of proteome research · 2026Article
- Age-related nigral downregulation of the Parkinson's risk factor FAM49B primes human microglia for inflammaging.npj aging · 2025Article
- FAM49B suppresses ovarian cancer cell growth through regulating MAPK signaling.American journal of cancer research · 2025Article
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Authors and funding
10 authors.
Funding
Abstract
The fate of developing T cells is determined by the strength of T cell receptor (TCR) signal they receive in the thymus. This process is finely regulated through the tuning of positive and negative regulators in thymocytes. The Family with sequence similarity 49 member B (Fam49b) protein is a newly discovered negative regulator of TCR signaling that has been shown to suppress Rac-1 activity in vitro in cultured T cell lines. However, the contribution of Fam49b to the thymic development of T cells is unknown. To investigate this important issue, we generated a novel mouse line deficient in Fam49b (Fam49b-KO). We observed that Fam49b-KO double positive (DP) thymocytes underwent excessive negative selection, whereas the positive selection stage was unaffected. Fam49b deficiency impaired the survival of single positive thymocytes and peripheral T cells. This altered development process resulted in significant reductions in CD4 and CD8 single-positive thymocytes as well as peripheral T cells. Interestingly, a large proportion of the TCRγδ
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