TAF9 (TATA-box binding protein associated factor 9)
TAF9 (TATA-box binding protein associated factor 9) is a core subunit of the TFIID complex, a critical multi-protein assembly essential for the initiation of transcription by RNA polymerase II. As a member of the TAF gene family, TAF9 contains conserved structural domains, such as histone-fold domains, that facilitate its interaction with the TATA-box binding protein (TBP) and other TAF proteins to stabilize the architecture of the TFIID complex. This complex functions within the cell nucleus to recognize the TATA box, a conserved DNA sequence located in the promoter region of many eukaryotic genes, thereby regulating the precise activation or repression of specific gene expression. Beyond its primary role in transcription initiation, TAF9 may also contribute to chromatin remodeling and signal transduction pathways, ensuring that cellular responses to developmental and environmental cues are appropriately mediated. Disruptions in TAF9 function, such as those caused by mutations, can compromise the integrity of the TFIID complex, leading to aberrant global gene expression profiles that are implicated in various pathological conditions, including developmental defects, neurodevelopmental disorders, and cancers such as colorectal carcinoma. These diseases may arise from the disruption of transcriptional control over cell cycle regulators and differentiation genes. Furthermore, altered TAF9 expression levels can have significant biological consequences; overexpression may lead to the inappropriate activation of proto-oncogenes or disturb the balance of other transcription factors, while reduced expression can result in insufficient transcription of essential housekeeping genes, potentially triggering apoptosis or inhibiting cellular proliferation. It is important to distinguish TAF9 from its paralog, TAF9B, as they may exhibit distinct tissue-specific expression patterns and functional nuances within the broader context of transcriptional regulation.
Gene Ontology
Subcellular localization of TAF9 (and its protein):
- plasma membrane
- cytoplasm
- extracellular
- golgi
- vesicle
- cytoskeleton
- endoplasmic reticulum
- nucleus
- endosome
- lysosome
- mitochondrion
Gene Ontology (GO) terms for TAF9:
| Interacting Gene | Interaction | Source/Score |
| Name |
|---|
| 3022 Basal transcription factors [PATH:hsa03022] |
| Name |
|---|
| Chromatin modifying enzymes |
| Chromatin organization |
| Disease |
| Gene Expression |
| HATs acetylate histones |
| HIV Infection |
| HIV Life Cycle |
| HIV Transcription Initiation |
| Infectious disease |
| Late Phase of HIV Life Cycle |
| RNA Polymerase II HIV Promoter Escape |
| RNA Polymerase II Pre-transcription Events |
| RNA Polymerase II Promoter Escape |
| RNA Polymerase II Transcription |
| RNA Polymerase II Transcription Initiation |
| RNA Polymerase II Transcription Initiation And Promoter Clearance |
| RNA Polymerase II Transcription Pre-Initiation And Promoter Opening |
| Transcription |
| Transcription of the HIV genome |
| Disease | Score | NofPmids | NofSnps | Source |
| HIV Infections | 0.12 | 1 | 0 | CTD_human |
| IGA Glomerulonephritis | 0.12 | 1 | 0 | CTD_human |
| Malignant neoplasm of breast | 0.000271442 | 1 | 0 | BeFree |
| Adenocarcinoma of lung (disorder) | 0.000271442 | 1 | 0 | BeFree |
| Liver carcinoma | 0.000271442 | 1 | 0 | BeFree |
| Breast Carcinoma | 0.000271442 | 1 | 0 | BeFree |
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