Domanda del libro di testo
If a cell suffers damage to its DNA while in S phase, how can this damage be repaired before the cell enters mitosis?
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Ch. 24 - Cancer Genetics
Klug12th EditionConcepts of GeneticsISBN: 9780135564776
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TOC.tableOfContents
- Ch. 1 - Introduction to Genetics17
- Ch. 2 - Mitosis and Meiosis36
- Ch. 3 - Mendelian Genetics51
- Ch. 4 - Extensions of Mendelian Genetics74
- Ch. 5 - Chromosome Mapping in Eukaryotes51
- Ch. 6 - Genetic Analysis and Mapping in Bacteria and Bacteriophages46
- Ch. 7 - Sex Determination and Sex Chromosomes33
- Ch. 8 - Chromosome Mutations: Variation in Number and Arrangement40
- Ch. 9 - Extranuclear Inheritance31
- Ch. 10 - DNA Structure and Analysis43
- Ch. 11 - DNA Replication and Recombination44
- Ch. 12 - DNA Organization in Chromosomes30
- Ch. 13 - The Genetic Code and Transcription54
- Ch. 14 - Translation and Proteins47
- Ch. 15 - Gene Mutation, DNA Repair, and Transposition41
- Ch. 16 - Regulation of Gene Expression in Bacteria29
- Ch. 17 - Transcriptional Regulation in Eukaryotes41
- Ch. 18 - Post-transcriptional Regulation in Eukaryotes33
- Ch. 19 - Epigenetics33
- Ch. 20 - Recombinant DNA Technology44
- Ch. 21 - Genomic Analysis36
- Ch. 22 - Applications of Genetic Engineering and Biotechnology36
- Ch. 23 - Developmental Genetics37
- Ch. 24 - Cancer Genetics34
- Ch. 25 - Quantitative Genetics and Multifactorial Traits54
- Ch. 26 - Population and Evolutionary Genetics45
Klug12th EditionConcepts of GeneticsISBN: 9780135564776Non è quello che usi tu?Cambia libro di testo
Capitolo 24, Problema 11
Part of the Ras protein is associated with the plasma membrane, and part extends into the cytoplasm. How does the Ras protein transmit a signal from outside the cell into the cytoplasm? What happens in cases where the ras gene is mutated?
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Ras protein is a small GTPase that acts as a molecular switch in signal transduction pathways, particularly in the transmission of signals from cell surface receptors to the inside of the cell.
When a growth factor binds to a receptor tyrosine kinase (RTK) on the cell surface, the receptor becomes activated and undergoes autophosphorylation, creating binding sites for adaptor proteins.
Adaptor proteins, such as Grb2, bind to the phosphorylated RTK and recruit a guanine nucleotide exchange factor (GEF) like SOS, which facilitates the exchange of GDP for GTP on Ras, activating it.
Activated Ras (Ras-GTP) interacts with and activates downstream effectors, such as the Raf kinase, initiating a kinase cascade that ultimately leads to changes in gene expression and cellular responses.
In cases where the ras gene is mutated, it can lead to constitutive activation of Ras, meaning it remains in the GTP-bound active state, which can result in uncontrolled cell division and contribute to cancer development.
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Signal Transduction
Signal transduction is the process by which a cell responds to external signals, often involving a series of molecular events. In the case of the Ras protein, it acts as a molecular switch that relays signals from cell surface receptors to intracellular pathways, facilitating communication between the extracellular environment and the cytoplasm.
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05:53
Transduction
Ras Protein Function
The Ras protein is a small GTPase that plays a critical role in cell signaling pathways, particularly those regulating cell growth and differentiation. When activated by binding to GTP, Ras interacts with various downstream effectors, propagating the signal within the cell. This activation is crucial for normal cellular functions.
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05:05Proteins
Mutations in the Ras Gene
Mutations in the ras gene can lead to constitutive activation of the Ras protein, meaning it remains in an active state regardless of external signals. This can result in uncontrolled cell proliferation and is commonly associated with various cancers. Understanding these mutations is essential for developing targeted therapies in cancer treatment.
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04:46Cancer Mutations
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Of the two classes of genes associated with cancer, tumor-suppressor genes and oncogenes, mutations in which group can be considered gain-of-function mutations? In which group are the loss-of-function mutations? Explain.
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