Identify the mutation(s) that lead to the most loss in transcriptional activity, and discuss whether those match expectations based on the consensus sequence for the Initiator. B. Hypothesize a molecular mechanism to explain how the mutations identified in Part A result in loss of transcription activity. C. Identify whether any mutations cause transcription to initiate from a different position than wild-type, and provide a brief explanation as to why that occurs for those mutant core promoters.

Biochemistry
6th Edition
ISBN:9781305577206
Author:Reginald H. Garrett, Charles M. Grisham
Publisher:Reginald H. Garrett, Charles M. Grisham
Chapter29: Transcription And The Regulation Of Gene Expression
Section: Chapter Questions
Problem 17P
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A. Identify the mutation(s) that lead to the most loss in transcriptional activity, and discuss
whether those match expectations based on the consensus sequence for the Initiator.
B. Hypothesize a molecular mechanism to explain how the mutations identified in Part A
result in loss of transcription activity.
C. Identify whether any mutations cause transcription to initiate from a different position
than wild-type, and provide a brief explanation as to why that occurs for those mutant
core promoters.

THIS IS A PRIMER EXTENSION ASSAY

WT
Single Nucleotide Substitutions
of the PMAIP1 Promoter
A T ст
CA GA GT
↓↓↓↓↓↓↓↓↓↓
G C A A TGAGA C
-5 -4 -3 -2 -1 +1 +2 +3 +4 +5
Positions Relative to +1 TSS
Single Nucleotide Substitutions
of the TFRC Promoter
CTCA GA
G C
WT ↓↓↓↓↓↓↓↓↓ ↓
T TAAT G A GA T
-5 -4 -3 -2 -1 +1 +2 +3 +4 +5
Positions Relative to +1 TSS
Transcribed Image Text:WT Single Nucleotide Substitutions of the PMAIP1 Promoter A T ст CA GA GT ↓↓↓↓↓↓↓↓↓↓ G C A A TGAGA C -5 -4 -3 -2 -1 +1 +2 +3 +4 +5 Positions Relative to +1 TSS Single Nucleotide Substitutions of the TFRC Promoter CTCA GA G C WT ↓↓↓↓↓↓↓↓↓ ↓ T TAAT G A GA T -5 -4 -3 -2 -1 +1 +2 +3 +4 +5 Positions Relative to +1 TSS
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