Learning Objectives
5 objectives- Understand the fundamental processes and mechanisms of gene expression.
- Analyze the multiple levels of gene expression regulation including transcriptional, post-transcriptional, translational, and epigenetic controls.
- Evaluate the impact of environmental and hormonal factors on gene expression.
- Examine feedback mechanisms and their roles in gene regulation.
- Investigate how dysregulation of gene expression contributes to disease development and progression.
Content Outline
PreviewUnit 3127: Gene Expression and Regulation
1. Introduction to Gene Expression
- Definition and significance of gene expression
- Central Dogma of Molecular Biology: DNA → RNA → Protein
- Functional gene products: proteins and RNA molecules
- Overview of gene expression stages
2. Transcriptional Regulation
- Overview of transcription process
- Key elements in transcription initiation
- Promoters
- Enhancers and silencers
- Role of transcription factors
- Activators and repressors
- Epigenetic modifications influencing transcription
- DNA methylation
- Histone modifications (acetylation, methylation)
- Chromatin remodeling and accessibility
3. Post-transcriptional Regulation
- RNA processing mechanisms
- 5’ capping
- 3’ polyadenylation
- RNA splicing
- Alternative splicing and its biological significance
- RNA stability and degradation pathways
- MicroRNA (miRNA) mediated regulation
- Biogenesis and function of miRNAs
- RNA-induced silencing complex (RISC)
4. Translational Regulation
- Translation initiation and control points
- Regulatory elements in mRNA
- 5’ untranslated regions (UTRs)
- Internal ribosome entry sites (IRES)
- Upstream open reading frames (uORFs)
- Role of RNA-binding proteins
- Mechanisms controlling ribosome binding and elongation
5. Epigenetic Regulation of Gene Expression
- Concept of epigenetics and heritable gene expression changes
- DNA methylation patterns and gene silencing
- Histone code and its impact on chromatin state
- Non-coding RNAs in epigenetic regulation
- Epigenetic reprogramming and cellular differentiation
6. Environmental and Hormonal Regulation
- Influence of environmental cues on gene expression
- Temperature, light, nutrients, stress
- Hormonal signaling pathways
- Steroid hormones, peptide hormones
- Signal transduction mechanisms affecting transcription factors
- Cross-talk between environmental and hormonal regulation
7. Feedback Mechanisms in Gene Regulation
- Negative and positive feedback loops
- Autoregulation of gene expression
- Examples of feedback in metabolic pathways and development
- Dynamic regulation and homeostasis
8. Disease Implications of Gene Expression Dysregulation
- Gene expression abnormalities in cancer
- Oncogenes and tumor suppressor genes
- Genetic disorders related to expression defects
- Autoimmune diseases and gene regulation
- Therapeutic approaches targeting gene expression
- Epigenetic drugs
- RNA interference therapies
Summary and Integration
- Recap of gene expression stages and regulatory layers
- Interconnectedness of regulatory mechanisms
- Implications for research and medicine
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