What is the typical feature found in many human promoters?

What is the typical feature found in many human promoters?

• A. CAAT box
• B. GC box
• C. TATA box
• D. Initiator element

Answer: (C)

Promoter regions in eukaryotic genes include a TATA box, a DNA sequence typically located about 25–30 bases upstream of the transcription start site. This motif is recognized by the TATA-binding protein, a key part of the transcription factor complex TFIID. Binding of TBP bends the DNA and helps assemble the preinitiation complex, positioning RNA polymerase II so transcription begins at the correct spot. This makes the TATA box a classic feature that guides efficient and defined transcription initiation. While many promoters do have a TATA box, some promoters—especially housekeeping genes—are TATA-less and rely on other elements like initiator sequences or GC-rich regions, but the TATA box remains the best-known and most representative promoter feature.

Promoter regions in eukaryotic genes include a TATA box, a DNA sequence typically located about 25–30 bases upstream of the transcription start site. This motif is recognized by the TATA-binding protein, a key part of the transcription factor complex TFIID. Binding of TBP bends the DNA and helps assemble the preinitiation complex, positioning RNA polymerase II so transcription begins at the correct spot. This makes the TATA box a classic feature that guides efficient and defined transcription initiation. While many promoters do have a TATA box, some promoters—especially housekeeping genes—are TATA-less and rely on other elements like initiator sequences or GC-rich regions, but the TATA box remains the best-known and most representative promoter feature.