EP385: What You Need to Know About Mono and Poly genics in Lipid Management

Welcome to my podcast. I am Doctor Warrick Bishop, and I want to help you to live as well as possible for as long as possible. I’m a practising cardiologist, best-selling author, keynote speaker, and the creator of The Healthy Heart Network. I have over 20 years as a specialist cardiologist and a private practice of over 10,000 patients. Podcast Summary Introduction: Dr. Warrick Bishop, a cardiologist, author, and CEO of the Healthy Heart Network, hosts this episode to help Australians understand cardiovascular health. With a heart attack occurring every 20 minutes in Australia, Dr. Bishop focuses on explaining genetics and cholesterol-related issues in simple, clinically relevant terms to help people make informed decisions about their heart health. Key Takeaways: Genetics influence cardiovascular health in two main ways: monogenic (single gene mutations with significant impact) and polygenic (multiple small abnormalities combining to cause problems). Monogenic abnormalities are like brake failure in a car—a single critical failure point—while polygenic issues resemble multiple contributing factors (worn brakes, bald tires, dirty windshield) that collectively cause problems. Familial hypercholesterolemia is a monogenic condition caused by defects in LDL receptor or PCSK9 protein function, resulting in marked elevation of LDL cholesterol that runs clearly in families. Polygenic elevated cholesterol typically produces lower cholesterol levels than monogenic familial hypercholesterolemia and may not show the same strong family linkages or cardiovascular risk patterns. Mixed dyslipidemia (elevated cholesterol and triglycerides together) is predominantly polygenic and often associated with a predisposition toward diabetes. Very high triglyceride levels in isolation tend to be monogenic inherited conditions that can cause serious complications like pancreatitis, while mild-to-moderate elevations are typically polygenic. Lipoprotein(a) is the most genetically significant risk factor for cardiovascular disease and follows a clear monogenic inheritance pattern from family members. Identifying whether lipid disorders are monogenic or polygenic helps clinicians screen families more effectively and sometimes identify specific genes involved in the condition.