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Target intelligence / Profile preview
Transcription factor-like 5 protein (TCFL5)
- Target
- TCFL5
- Molecular classification
- Transcription factor, Basic helix-loop-helix (bHLH) protein
01
Overview
Transcription factor-like 5 protein (TCFL5) is a basic helix-loop-helix transcription factor that primarily acts as a DNA-binding transcriptional repressor specific for RNA polymerase II. TCFL5 is expressed in a cell-type and stage-specific manner during spermatogenesis, with key roles in regulating germ cell differentiation. Isoform diversity gives rise to distinct biological effects, notably in colorectal cancer, where different TCFL5 variants can be either pro-tumorigenic or anti-tumorigenic through modulation of pluripotency genes. Additionally, TCFL5 is implicated in chemotherapy resistance in hematologic malignancies, possibly via regulation of antioxidant mechanisms. Its precise mechanisms involve modulation of transcriptional programs related to cell cycle, proliferation, differentiation, and survival
- Other names
- E2BP-1CHAFiglbHPV-16 E2-binding protein 1SOSF1BHLHE82spermatogenesis- and oogenesis-specific bHLH-containing protein 1transcription factor-like 5 (basic helix-loop-helix)
02
Mechanism of action
Negative modulation of USF-dependent gene expression Regulation of transcriptional programs linked to proliferation, pluripotency, and drug resistance In hematologic malignancies, modulation of GPX4 influences chemotherapy sensitivity
03
Biological functions
DNA-binding transcription repressor activity (RNA polymerase II-specific)Negative regulation of transcription by RNA polymerase IIRegulation of cell population proliferationSpermatogenesisModulation of pluripotency-associated gene expression (e.g., SOX2, KLF4)Involvement in immune cell quiescence and activation
04
Disease associations
Cancer (colorectal cancer—isoform-specific roles in tumor growth and proliferation)Chemotherapy resistance (diffuse large B-cell lymphoma, acute lymphoblastic leukemia)Germ cell differentiation and testicular germ cell neoplasms
05
Safety considerations
Isoform-specific pro-tumoral activity may complicate therapeutic targetingPotential impact on fertility due to role in spermatogenesisEmergent role in chemotherapy resistance
06
Interacting drugs
Doxorubicin (TCFL5 knockdown sensitizes DLBCL cells to doxorubicin)
07
Biomarkers
TCFL5 expression in testicular tissues for germ cell differentiation statusTCFL5 isoform expression in colorectal cancer for tumor progression and biology
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