Concept explainers
(a)
To determine: The way by which deletion within the GAL4 gene would affect transcription of the yeast GAL1 gene in the presence of galactose.
Introduction: Transcription is the process of formation of RNA (ribonucleic acid) from the complementary DNA (deoxyribonucleic acid). GAL genes are required for the proper growth of yeast in galactose medium. The regulation of GAL genes is regulated by the products of GAL4, GAL8, and GAL3 genes. Mutation in these regions may disrupt the process of transcription in yeast.
(b)
To determine: The way by which deletion within the entire GAL3 gene would affect transcription of the yeast GAL1 gene in the presence of galactose.
Introduction: As mentioned in the concept introduction part a.
(c)
To determine: The way by which deletion of a mutation within the GAL80 gene that blocks the ability of Gal80 protein to interact with Gal3p would affect transcription of the yeast GAL1 gene in the presence of galactose.
Introduction: As mentioned in the concept introduction part a.
(d)
To determine: The way by which deletion of one of the four UASG elements upstream from the GAL1 gene would affect transcription of the yeast GAL1 gene in the presence of galactose.
Introduction: As mentioned in the concept introduction part a.
(e)
To determine: The way by which a point mutation in the GAL1 core promoter that alters the sequence of the TATA box would affect transcription of the yeast GAL1 gene in the presence of galactose.
Introduction: As mentioned in the concept introduction part a.
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Concepts of Genetics (12th Edition)
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- A full-length eukaryotic gene is inserted into a bacterial chromosome. The gene contains a complete promoter sequence and a functional polyadenylation sequence, and it has wild-type nucleotides throughout the transcribed region. However, the gene fails to produce a functional protein. a)List at least 3 possible reasons why this eukaryotic gene is not expressed in bacteria. b)What changes would you recommend to permit expression of this eukaryotic gene in a bacterial cell?arrow_forwardShown below is a schematic diagram illustrating a very short gene with 5000 bp region of an unknown Schizosaccharomyces pombe genome. (Note: Transcription starts at Transcription Start Site (TSS).) TSS 5. 3' 3 +1 (i) Name the specific regions that can be recognized by Transcription Factor IID (TF ID) and indicate the locations in the diagram above. (ii) List the mechanistic steps that can trigger the initiation of transcription by Transcription Factor IIH (TF IIH).arrow_forwardSearching the yeast Saccharomyces cerevisiae genome, researchers found approximately 4,000 DNA sites with a sequence which could potentially bind the yeast transcription factor GAL4. GAL4 activates the transcription of galactose genes. Yet there are only 10 GAL4-binding sites which control the genes necessary for galactose metabolism. The GAL4 binding sequence is CGGAT#AGAAGC*GCCG, where # is T, C or G, and * is C or T. In one chromatin immunoprecipitation experiment (ChIP), yeast growing on galactose were lysed, and subjected to cross-linking reagents which cross-linked transcription factors and activators to DNA. Next the DNA was sheared into small fragments, and antibodies to GAL4 were added. These antibodies coprecipitated the GAL4 and the DNA it was cross-linked to. The cross-linking was then chemically reversed, and the DNA was isolated, cloned into a library of plasmids and sequenced. Results showed that only 10 different DNA sequences had GAL4 bound. Since the…arrow_forward
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