TAF2 (TATA-box binding protein associated factor 2) is a critical component of the TFIID basal transcription factor complex, which plays an essential role in RNA polymerase II-dependent transcription initiation 1. TAF2 forms a promoter DNA-binding subcomplex within TFIID together with TAF1 and TAF7, facilitating promoter recognition and pre-initiation complex assembly 2. The protein contains an intrinsically disordered region (IDR) that drives TAF2 localization to nuclear speckles, where it interacts with RNA splicing factors like SRRM2, linking transcription initiation to RNA processing 1. TAF2 assembles through a stepwise pathway involving cytoplasmic formation of a TAF2-TAF8-TAF10 subcomplex before nuclear import and incorporation into holo-TFIID 2. Beyond its role in basal transcription, TAF2 is essential for hepatocyte survival and demonstrates oncogenic potential when overexpressed 3. Biallelic TAF2 mutations cause a severe neurodevelopmental disorder characterized by intellectual disability, postnatal microcephaly, thin corpus callosum, and foot deformities 4. TAF2 is frequently amplified in hepatocellular carcinoma and other cancers, where it promotes tumorigenesis by regulating tumor-promoting genes 35. The dual roles of TAF2 in essential cellular functions and disease pathogenesis highlight its importance as both a fundamental transcriptional regulator and potential therapeutic target.