From Atoms To Medicine

Concerns of Physicians
  • Understanding and Maintenance of Health
    • Important for achieving maximal survival of the organism.
  • Effective Treatment of Diseases
    • Essential to improve health outcomes.
Cell as a Factory
  • Cell functions:
    • Acts like a factory with conveyor systems, energy stations, and packaging centers.
  • Organization of the cell reflects its complexity and functionality.
Health Definition
  • Health is the state where intra- and extracellular reactions
    develop at rates suitable for the organism's survival.
Logic of Life
  • Molecules are lifeless but when structured appropriately, they form living systems that can:
    • Grow, move,
    • Perform metabolism,
    • Respond to stimuli,
    • Replicate accurately.
Human Body Complexity
  • Composed of 100 trillion cells, organized into subcellular structures.
  • Organelles are complex assemblies comprising macromolecules made of simple chemical building blocks (e.g., sugars, amino acids).
Biomolecules: The Molecules of Life
  • Element Composition:
    • More than 99% of the human body's atoms are hydrogen, oxygen, carbon, and nitrogen.
  • Carbon's Role:
    • Forms stable covalent bonds due to versatility.
Biomolecular Hierarchy
  • Structure Complexity:
    • Simple molecules form macromolecular structures following a hierarchical organization.
  • Biomolecule Properties:
    • Must suit living conditions and fulfill life requirements, primarily through Information and Energy.
Functions of Biomolecules
  • Some biomolecules carry life’s information (DNA).
  • Others translate this information into functional structures essential for life.
  • Interactions are the processes that constitute life.
Macromolecules Directionality
  • Built from units (e.g., amino acids, nucleotides).
  • Macromolecules exhibit structural polarity, comparable to having a “head” and “tail.”
Informational Macromolecules
  • The arrangement of building blocks conveys information like letters form words.
Biological Information Hierarchy
  • Information flows from DNA → RNA → Proteins, affecting biology from the molecular to ecological level.
The Central Dogma of Molecular Biology
  • Key Processes:
    • DNA Replication: Passes genetic information.
    • Transcription: Converts DNA into RNA.
    • Translation: Synthesizes proteins from mRNA.
Information Types in Biology
  • Digital Information:
    • Stored in the genome.
  • Environmental Information:
    • Influences and modifies genetic information.
Systems Biology
  • Aims to understand how genetic and environmental information interact to mediate:
    • Evolution
    • Development (e.g., adult formation from a fertilized egg).
    • Physiology (e.g., immune responses).
Interaction of Biological Information
  • Integration of genome and environment via biological networks produces phenotypes, like protein secretion.