DNA Damage and Repair Mechanisms: A Foundation

DNA integrity is essential for life, yet it is constantly challenged by endogenous and environmental factors. Understanding how cells detect and repair damage is critical for molecular biology and disease study. This text-only course provides a structured introduction to the core concepts of DNA maintenance. You will learn to identify the major types of DNA lesions and master the complex pathways cells use to restore the genome accurately. What you'll learn: * Understand the chemical nature of common DNA lesions, including base modifications, strand breaks, and cross-links. * Master the steps and key enzymes involved in Nucleotide Excision Repair (NER) and Base Excision Repair (BER) pathways. * Analyze the mechanisms of double-strand break repair, contrasting Homologous Recombination (HR) and Non-Homologous End Joining (NHEJ). * Learn the role of MisMatch Repair (MMR) in post-replication proofreading and preventing mutation accumulation. * Apply knowledge of repair pathway defects to understand the molecular basis of genomic instability and associated human diseases. Course Overview: We start with an overview of DNA structure and common damage sources, progressing through detailed written explanations of the major repair systems, focusing on the biochemical steps and regulatory elements of each pathway. Target Audience: This course is designed for absolute beginners in molecular biology, genetics, or biochemistry. No prior advanced knowledge of genomic maintenance is required. Start reading today to unlock the secrets of cellular DNA repair.