Pre-tRNA,Met tRNA, Met No DNA Mutant gene Wt gene M 1 2 3 4 5 6 7 8 9 1. Why was [a-32PIGTP used in this experiment? 2. What material generates the smear in the upper region of the autoradiograph? Why is this smear absent from the marker? 3. How does the mutation affect the transcription of the microinjected gene? 4. How does the mutation affect the processing of the primary transcripts? 5. How does the mutation affect the nucleocytoplasmic transport of tRNA Met? Samples: Marker M: 32P-labeled primary transcript No exogenous DNA injected 1: whole oocyte 2: nuclei 3: cytoplasm Mutant gene injected 4: whole oocyte 5: nuclei 6: cytoplasm Wild-type gene injected 7: whole oocyte 8: nuclei 9: cytoplasm

Biology 2e
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Author:Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark
Chapter14: Dna Structure And Function
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Problem 37CTQ: An adult with a history of tanning has his genome sequenced. The beginning of a protein-coding...
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Experiment The consequence of a point mutation in a human tRNAMe gene was studied in this experiment. Plasmids carrying either the wild-type tRNA Me transcription unit or the mutant gene were microinjected into Xenopus laevis oocytes together with [a-3 PIGIP. The oocytes were incubated for 5 hours, and then RNA was extracted from whole oocytes, separated nuclei, or cytoplasm. RNA samples were subjected to polyacrylamide gel electrophoresis and autoradiography

Pre-tRNA,Met
tRNA, Met
No DNA
Mutant gene
Wt gene
M
1 2 3
4 5 6
7 8 9
1. Why was [a-32PIGTP used in this experiment?
2. What material generates the smear in the upper region of the autoradiograph? Why is
this smear absent from the marker?
3. How does the mutation affect the transcription of the microinjected gene?
4. How does the mutation affect the processing of the primary transcripts?
5. How does the mutation affect the nucleocytoplasmic transport of tRNA Met?
Transcribed Image Text:Pre-tRNA,Met tRNA, Met No DNA Mutant gene Wt gene M 1 2 3 4 5 6 7 8 9 1. Why was [a-32PIGTP used in this experiment? 2. What material generates the smear in the upper region of the autoradiograph? Why is this smear absent from the marker? 3. How does the mutation affect the transcription of the microinjected gene? 4. How does the mutation affect the processing of the primary transcripts? 5. How does the mutation affect the nucleocytoplasmic transport of tRNA Met?
Samples:
Marker
M: 32P-labeled primary transcript
No exogenous DNA injected
1: whole oocyte
2: nuclei
3: cytoplasm
Mutant gene injected
4: whole oocyte
5: nuclei
6: cytoplasm
Wild-type gene injected
7: whole oocyte
8: nuclei
9: cytoplasm
Transcribed Image Text:Samples: Marker M: 32P-labeled primary transcript No exogenous DNA injected 1: whole oocyte 2: nuclei 3: cytoplasm Mutant gene injected 4: whole oocyte 5: nuclei 6: cytoplasm Wild-type gene injected 7: whole oocyte 8: nuclei 9: cytoplasm
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