OCA-T2 (F5A7Z) Rabbit Monoclonal Antibody #48122

OCA-T2 (COLCA2, POU2AF3) and its paralog OCA-T1 (C11orf53) were first identified by single-cell RNA sequencing (scRNAseq) to be co-expressed with the transcription factor POU2F3, in specialized epithelial cells called tuft cells (1). Tuft cells exist as solitary chemosensory cells within mucosal epithelium and serve to coordinate interactions between immune and neuronal cells (2). Systematic gene knockdown experiments demonstrated chromatin-level interactions between OCA-T1, OCA-T2, and POU2F3 that appeared essential for tuft cell lineage determination (1). Notably, the oncogenic transformation of tuft cells has been identified as a defining feature of a distinct small cell lung cancer (SCLC) subtype known as SCLC-P, defined by their dependence on POU2F3 expression (3). In vitro studies showed that targeted knockdown of OCA-T1 and OCA-T2 suppressed growth of cultured SCLC-P cell lines, supporting a role for OCA-T1 and OCA-T2 in SCLC (4). Subsequently, it has been observed that gene fusions between EWSR1 or FUS and OCA-T2 are defining features of recently discovered aggressive sarcoma subtypes (5-7).