Genomics Notes

Page 1: Genomics Overview

Genetic Fundamentals

  • Nucleotide Difference:

    • Humans share 99.9% of their DNA, with only 0.1% variation accounting for individual uniqueness.

  • Definitions:

    • Genes: Basic units of heredity made up of DNA, serving as instructions to create proteins.

    • Genetics: Discipline focusing on individual genes and their impact on rare genetic disorders.

    • Genome: Complete set of DNA in an organism, including all genes, containing necessary information for development and maintenance.

    • Genomics: Study of genomes and interactions between genes, environment, and psychosocial factors.

Historical Milestones in Genomics

  • 1953: Watson and Crick described DNA's double helix structure.

  • Early 1970s: Fred Sanger sequenced the first genome; Walter Fiers sequenced the first gene in 1972.

  • Human Genome Project (1990-2003):

    • Aimed to determine the full sequence of the human genome.

    • First human genome sequenced in 2000 (99.99% accuracy).

    • Cost: approximately 3 billion dollars.

  • International HapMap Project (2002): Identified common genetic variations in humans.

  • Precision Medicine Initiative:

    • Short-term: Expand cancer research in precision medicine.

    • Long-term: Broaden precision medicine across all healthcare areas.

Genomics 101

  • Human Genome:

    • Contains 20,000-25,000 genes that code for roughly 3 proteins.

    • Proteins are essential for organs, tissues, chemical reactions, and cellular signaling.

Hospital Implications

  • Availability: Genomic information impacts patient care across all hospital areas.

  • Pharmacogenetics:

    • Examines how genes influence drug responses.

    • Aims to tailor medication and dosing to individual genetic profiles (example: targeted cancer treatments).

  • Preventative Treatments: Access to genetic knowledge aids in risk assessment (e.g., mastectomy for high breast cancer risk).

Resources for Nurses

  • GenomeEd: High-quality genomic resources for healthcare teams and educators, vetted and reviewed by professionals.

  • International Society of Nurses in Genetics (ISONG): Educational resources on genomics updated biannually.

Page 2: Genomic Considerations and Clinical Practice

Educational and Institutional Resources

  • National Human Genome Research Institute (NHGRI):

    • Subscription option for updates on genomics learning opportunities.

  • National Coordinating Center for the Regional Genetics Networks (NCC):

    • Offers education modules, guidelines, and free newsletter subscriptions.

Considerations for Clinical Practice

  • Genomic Data Roles:

    • Can be permanently stored and used to assess susceptibility to conditions.

    • May introduce uncertain risks.

    • Subject to reinterpretation, potentially altering relevance.

    • Privacy issues involved, impacting family and reproductive decisions.

Genetic Discrimination & Ethical Considerations

  • Genetic Discrimination: Economic discrimination based on genetic data.

  • Insurance Implications:

    • Costs of genetic testing range from $100 to over $2,000.

  • Genetic Privacy & Confidentiality:

    • Genetic Information Nondiscrimination Act (GINA): Protects against genetic discrimination by employers and insurers.

  • Genetic Laws & Ethics:

    • Addresses ethical, legal, and social implications of genomic research, including education and integration into clinical practice.

Nursing Practice Application

  • Competencies:

    • Essential competencies for genetic and genomic nursing are outlined in the nursing guidelines published by the American Nurses Association.

  • References to foundational texts and guidelines included for further reading.