NURS 711 Week 1 Discussion Board Forum 1 on Genetics, Genomics and the Essentials Example

Discussion Board Forum 1: Genetics, Genomics and the Essentials for Nurses

NURS 711 Advanced Physiology/Pathophysiology, Discussion Board Forum 1

Thread by [Student Name]

The patient and the classmates replied to are composites written for a model discussion.

Last month, a 58-year-old man on my cardiac step-down unit was discharged after a stent was placed in his right coronary artery. His discharge medications included clopidogrel 75 mg daily for twelve months. Two weeks later, his cardiologist received the result of a pharmacogenomic panel ordered during admission: he carried two loss-of-function CYP2C19 alleles, making him a poor metabolizer. For him, the standard prescription was close to a placebo at exactly the time a clot in the new stent could kill him. Nobody had done anything careless. The panel had simply been sent to an outside laboratory, the result came back after discharge, and the discharge medication list had been built from a standard order set that did not ask about genotype.

The mechanism is a clear example of what McCance and Huether (2019) describe as the link between genotype and phenotype. Clopidogrel arrives in the body inactive; the liver must transform it into the molecule that actually blocks platelets, and that transformation relies chiefly on the cytochrome P450 enzyme CYP2C19. Variants such as the 2 and 3 alleles reduce or eliminate enzyme function, so carriers form less active drug and their platelets remain more reactive. The Clinical Pharmacogenetics Implementation Consortium's 2022 update advises that intermediate and poor metabolizers who have had a stent placed or an acute coronary event be switched to an alternative antiplatelet agent, such as prasugrel or ticagrelor, when there is no contraindication (Lee et al., 2022). Roughly a quarter to a third of people of European descent carry at least one loss-of-function allele, and the frequency is higher in some East Asian and Pacific Islander populations, so this is not a rare scenario. In a busy cardiac program placing several hundred stents a year, dozens of patients may be receiving an antiplatelet drug that their bodies cannot activate well.

The 2021 Essentials from the American Association of Colleges of Nursing (2021) expect nurses to integrate genetics and genomics into the knowledge base for practice and into person-centered care, and at the advanced level, to apply that knowledge to complex clinical decisions. Yet the evidence suggests many nurse practitioners are not ready. Walker et al. (2024) note that nurse practitioners report limited understanding of basic genetic concepts and of guidelines for drugs affected by genomic variation, and low confidence in interpreting genetic results, which inhibits genomics-informed care. A DNP who cannot read a pharmacogenomic result will not cause harm by doing something wrong, but by doing nothing at all.

For me, the lesson is practical. As a DNP-prepared nurse, I need to recognize which drugs carry actionable gene-drug guidance, know where to look for current recommendations, and build systems, such as alerts that flag a genotype result when the drug is ordered, so the information reaches the prescriber at the right moment. I also need to know the limits of what I know, so that I can explain a result honestly to a patient and refer to a genetic counselor or clinical pharmacist when the question goes beyond my training. The psalmist praised God for making him "fearfully and wonderfully made" (English Standard Version Bible, 2001/2016, Psalm 139:14). Genomics shows how intricate that making is, down to a single enzyme that determines whether a medicine works, and caring well for patients includes honoring that individuality.

Reply to Ashley

Ashley, you wrote that genomics feels like a specialty skill for genetic counselors rather than something a primary care DNP must master, and that our limited visit time should go to blood pressure, diabetes and screening. I understand the instinct, but evidence from DNP education suggests the gap is closer to home than that. Sullivan et al. (2025) reviewed the genetics and genomics content of a DNP family nurse practitioner curriculum and identified eleven gaps; the program added interactive case studies that addressed seven of them, and students valued how applicable the content was to their future practice. If a full DNP curriculum had eleven gaps, it is likely that many of us are graduating without the basics of pharmacogenomics, family history assessment or interpretation of direct-to-consumer results that patients bring to appointments. A primary care DNP does not need to replace the genetic counselor, but does need to recognize when a result changes a prescription and when a referral is needed. The same reasoning applies outside cardiology. Patients on certain antidepressants, opioids such as codeine and some anticoagulants also carry actionable gene-drug guidance, so a primary care DNP will meet these questions far more often than the word specialty suggests. Do you think our program's case studies could include a gene-drug interaction like the one in my thread, so we practice that recognition before we meet it in a clinic?

Reply to Brian

Brian, I agree with your point that knowledge alone will not change practice, and that systems matter as much as education. Your example of a patient whose warfarin dose was adjusted only after two bleeding episodes makes the case well. Greb and Abul-Husn (2026) describe building a genomics education program for primary care physicians and nurse practitioners in the United States and conclude that genomic capability requires three things together: education, clinical support built into the workflow, and access to genetics expertise. That matches what happened with my patient. The genotype result existed, but it reached the cardiologist two weeks after discharge, outside any decision point. Education would have helped the discharging clinician understand the result, but only workflow support, such as a pharmacy alert at the time of the order, would have made sure it was seen in time. Paul's picture of believers as one body warns the eye against telling the hand it is not needed (English Standard Version Bible, 2001/2016, 1 Corinthians 12:21), and genomic care seems to work the same way, with pharmacists, genetic counselors, nurses and prescribers each holding part of the answer. Access to expertise matters too; a quick electronic consult with a clinical pharmacist would have settled my patient's prescription in minutes. In your clinic, who would be the natural owner of a pharmacogenomic alert system: pharmacy, informatics or the clinicians themselves?

References

American Association of Colleges of Nursing. (2021). The essentials: Core competencies for professional nursing education. https://www.aacnnursing.org/Portals/0/PDFs/Publications/Essentials-2021.pdf

English Standard Version Bible. (2016). Crossway. (Original work published 2001)

Greb, A. E., & Abul-Husn, N. S. (2026). Preparing primary care professionals for genomics-informed healthcare. Trends in Genetics. Advance online publication. https://doi.org/10.1016/j.tig.2026.09.004

Lee, C. R., Luzum, J. A., Sangkuhl, K., Gammal, R. S., Sabatine, M. S., Stein, C. M., Kisor, D. F., Limdi, N. A., Lee, Y. M., Scott, S. A., Hulot, J., Roden, D. M., Gaedigk, A., Caudle, K. E., Klein, T. E., Johnson, J. A., & Shuldiner, A. R. (2022). Clinical Pharmacogenetics Implementation Consortium guideline for CYP2C19 genotype and clopidogrel therapy: 2022 update. Clinical Pharmacology & Therapeutics, 112(5), 959-967. https://doi.org/10.1002/cpt.2526

McCance, K. L., & Huether, S. E. (2019). Pathophysiology: The biologic basis for disease in adults and children (8th ed.). Elsevier.

Sullivan, J., Clerkin, K., & Chung, S. Y. (2025). Incorporating genetics and genomics content into a Doctor of Nursing Practice program. Journal of Nursing Education, 64(10), 678-680. https://doi.org/10.3928/01484834-20250129-02

Walker, T., Ersig, A. L., Dwyer, A. A., Kronk, R., Snyder, C. T., Whitt, K., & Willis, V. (2024). Integrating genomics and precision health knowledge into practice: A guide for nurse practitioners. Journal of the American Association of Nurse Practitioners, 36(10), 554-562. https://doi.org/10.1097/JXX.0000000000001050