Ch. 23 - Developmental Genetics

Klug - Concepts of Genetics 12th Edition

Klug12th EditionConcepts of Genetics ISBN: 9780135564776당신이 사용하는 게 아니라요?교과서 변경

Klug 12th Edition

Ch. 23 - Developmental Genetics

문제 11

23장, 문제 11

You observe that a particular gene is being transcribed during development. How can you tell whether the expression of this gene is under transcriptional or translational control?

검증된 단계별 안내

Step 1: Understand the difference between transcriptional and translational control. Transcriptional control regulates the production of mRNA from DNA, while translational control regulates the process of translating mRNA into protein.

Step 2: Measure the levels of mRNA for the gene in question. Techniques such as quantitative PCR (qPCR) or RNA sequencing can be used to determine the abundance of mRNA transcripts.

Step 3: Measure the levels of protein produced from the gene. Techniques such as Western blotting, ELISA, or mass spectrometry can be used to quantify the protein levels.

Step 4: Compare the mRNA levels to the protein levels. If mRNA levels are high but protein levels are low, this suggests translational control. If both mRNA and protein levels are low, this suggests transcriptional control.

Step 5: Perform additional experiments to confirm the mechanism of control. For example, use reporter assays to study transcriptional activity or ribosome profiling to analyze translational efficiency.

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Transcriptional Control

Transcriptional control refers to the regulation of gene expression at the transcription stage, where DNA is converted into RNA. This process is influenced by various factors, including transcription factors, enhancers, and silencers, which can either promote or inhibit the binding of RNA polymerase to the gene's promoter region. Understanding transcriptional control is essential for determining whether a gene's expression is being regulated before the RNA is synthesized.

Translational Control

Translational control involves the regulation of gene expression at the translation stage, where messenger RNA (mRNA) is translated into proteins. This control can be influenced by factors such as the availability of ribosomes, the presence of specific regulatory proteins, and the stability of the mRNA itself. Identifying translational control is crucial for understanding how a gene's expression can be modulated after transcription has occurred.

Gene Expression Analysis Techniques

Gene expression analysis techniques, such as quantitative PCR, Northern blotting, and ribosome profiling, are essential for determining whether a gene's expression is under transcriptional or translational control. These methods allow researchers to measure the levels of mRNA and protein produced from a gene, providing insights into the regulatory mechanisms at play. By comparing mRNA levels to protein levels, one can infer the stage of control affecting the gene's expression.

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교과서 질문

Embryogenesis and oncogenesis (generation of cancer) share a number of features including cell proliferation, apoptosis, cell migration and invasion, formation of new blood vessels, and differential gene activity. Embryonic cells are relatively undifferentiated, and cancer cells appear to be undifferentiated or dedifferentiated. Homeotic gene expression directs early development, and mutant expression leads to loss of the differentiated state or an alternative cell identity. M. T. Lewis [(2000). Breast Can. Res. 2:158–169] suggested that breast cancer may be caused by the altered expression of homeotic genes. When he examined 11 such genes in cancers, 8 were underexpressed while 3 were overexpressed compared with controls. Given what you know about homeotic genes, could they be involved in oncogenesis?

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교과서 질문

Experiments have shown that any nuclei placed in the polar cytoplasm at the posterior pole of the Drosophila egg will differentiate into germ cells. If polar cytoplasm is transplanted into the anterior end of the egg just after fertilization, what will happen to nuclei that migrate into this cytoplasm at the anterior pole?

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교과서 질문

List the main classes of zygotic genes. What is the function of each class of these genes?

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교과서 질문

The homeotic mutation Antennapedia causes mutant Drosophila to have legs in place of antennae and is a dominant gain-of-function mutation. What are the properties of such mutations? How does the Antennapedia gene change antennae into legs?

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교과서 질문

How can you determine whether a particular gene is being transcribed in different cell types?

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교과서 질문

The Drosophila homeotic mutation spineless aristapedia (ssᵃ) results in the formation of a miniature tarsal structure (normally part of the leg) on the end of the antenna. What insight is provided by (ssᵃ) concerning the role of genes during determination?

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