TAF8 (TATA-box binding protein associated factor 8) is a critical component of the TFIID basal transcription factor complex, which plays a major role in RNA polymerase II-dependent transcription initiation 1. TAF8 functions within the TFIID-B module alongside TAF5, and forms a heterodimer with TAF10 through its histone fold and proline-rich domains 2. The protein is essential for integrating TAF10 into higher-order TFIID core complexes and mediates both basal and activator-dependent transcription 2. TAF8 participates in cytoplasmic assembly of TFIID subcomplexes, specifically forming a heterotrimeric complex with TAF2 and TAF10 that is subsequently imported into the nucleus for holo-TFIID assembly 3. Beyond transcription, TAF8 plays specialized roles in cellular differentiation, particularly in adipogenesis, and is required for embryonic stem cell survival 4. Clinically, TAF8 mutations cause a severe neurodevelopmental disorder characterized by profound psychomotor retardation, microcephaly, hypomyelination, and progressive brain atrophy 5. The protein also undergoes alternative splicing that affects cancer metastasis, with different isoforms (TAF8L and TAF8S) having opposing roles in pancreatic cancer progression 6. TAF8's essential role in transcription machinery makes it critical for cellular viability, particularly in neuronal tissues.