Biochemistry
8th Edition
ISBN: 9781464126109
Author: Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr., Lubert Stryer
Publisher: W. H. Freeman
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Chapter 5, Problem 20P
Interpretation Introduction
Interpretation:
The reason corresponding to the given survey that the person B possesses no symptoms of drugs is to be stated. The possible defects in the other given people are to be stated.
Concept introduction:
The basic unit of heredity which is made up of DNA segments is known as gene.
The process of duplicating a specific DNA segment into a RNA segment with the help of an enzyme is known as transcription. The process of synthesizing proteins inside the cytoplasm after the completion of transcription is known as translation.
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A series of people are found to have difficulty eliminating certain types of drugs from their bloodstreams. The problem has been linked to a gene X, which encodes an enzyme Y. Six people were tested with the use of various techniques of molecular biology. Person A is a normal control, person B is asymptomatic but some of his children have the metabolic problem, and persons C through F display the trait. Tissue samples from each person were obtained. Southern analysis was performed on the DNA after digestion with the restriction enzyme Hin dIII. Northern analysis of mRNA also was done. In both types of analysis, the gels were probed with labeled X cDNA. Finally, a western blot with an enzyme-linked monoclonal antibody was used to test for the presence of protein Y. The results are shown here. Why is person B without symptoms? Suggest possible defects in the other people.
Researchers have identified a gene in humans that (when mutant)causes severe dwarfism and mental impairment. This disorder isinherited in an autosomal recessive manner, and the mutant alleleis known to be a loss-of-function mutation. The same gene hasbeen found in mice, although a mutant version of the gene has notbeen discovered in mice. To develop drugs and an effective therapyto treat this disorder in humans, it would be experimentallyuseful to have a mouse model. In other words, it would be desirableto develop a strain of mice that carry the mutant allele in thehomozygous condition. Experimentally, how would you developsuch a strain?
Researchers in search of loci in the human genome that arelikely to contribute to the constellation of factors leading tohypertension have compared candidate loci in humans and rats[Stoll, M., et al. (2000). New Target Regions for Human Hypertensionvia Comparative Genomics. Genome Res. 10:473–482].Through this research, they identified 26 chromosomal regionsthat they consider likely to contain hypertension genes. Howcan comparative genomics aid in the identification of genesresponsible for such a complex human disease? The researchersstate that comparisons of rat and human candidate loci tothose in the mouse may help validate their studies. Why mightthis be so?
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