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How does an environmental factor like stress generate a response that is transmitted from generation to generation?
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Ch. 19 - Epigenetics
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 19, Problema 1a
How do we know how methylation of promoters silences gene expression?
Guida verificata passo dopo passo1
Understand the concept of DNA methylation: DNA methylation involves the addition of a methyl group (CH₃) to the cytosine base in CpG dinucleotides, which are regions of DNA where a cytosine nucleotide is followed by a guanine nucleotide. This modification is a key epigenetic mechanism that regulates gene expression.
Recognize the role of promoters in gene expression: Promoters are sequences of DNA located upstream of a gene that serve as binding sites for transcription factors and RNA polymerase, enabling the initiation of transcription. Methylation of promoter regions can interfere with this process.
Learn how methylation silences gene expression: Methylation of CpG sites in promoter regions can prevent transcription factors from binding to the DNA. Additionally, methylated DNA can recruit proteins known as methyl-CpG-binding domain (MBD) proteins, which further inhibit transcription by forming repressive chromatin structures.
Understand the impact on chromatin structure: Methylation can lead to the recruitment of histone-modifying enzymes, such as histone deacetylases (HDACs), which remove acetyl groups from histones. This results in tighter packing of chromatin, making the DNA less accessible to the transcriptional machinery.
Connect methylation to gene silencing in biological contexts: Methylation of promoters is a common mechanism in development, where specific genes are turned off in certain cell types. It is also observed in cancer, where hypermethylation of tumor suppressor gene promoters can lead to their silencing, contributing to uncontrolled cell growth.
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Epigenetics
Epigenetics refers to the study of heritable changes in gene expression that do not involve alterations to the underlying DNA sequence. These changes can be influenced by various factors, including environmental stimuli, and play a crucial role in development and disease. Understanding epigenetics is essential for grasping how genes can be turned on or off in response to different conditions.
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04:35
Chromatin
DNA Methylation
DNA methylation is a biochemical process involving the addition of a methyl group to the DNA molecule, typically at cytosine bases in promoter regions. This modification can inhibit the binding of transcription factors and other proteins necessary for gene expression, effectively silencing the gene. Methylation patterns can be stable and passed on during cell division, influencing cellular function and identity.
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01:45DNA Proofreading
Gene Expression Regulation
Gene expression regulation encompasses the various mechanisms that control the timing and amount of gene product produced. This regulation is critical for normal development and cellular function, as it ensures that genes are expressed in the right cells at the right times. Epigenetic modifications, such as DNA methylation, are key players in this regulatory network, affecting how genes respond to internal and external signals.
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02:09Penetrance and Expressivity