New Study Reveals High Genetic Risk for Diabetes, Heart Disease, and Schizophrenia
A recent study indicates that a significant portion of the global population is genetically predisposed to three major diseases, regardless of their current health.
Most individuals have a high genetic risk for diabetes, cardiovascular disease, and schizophrenia.
The study analyzed data from nearly one million people, revealing widespread genetic variation.
Importance of context in interpreting genetic testing results is emphasized.
A groundbreaking study led by the University of Exeter has found that a large segment of the global population may possess a high genetic risk for three prevalent diseases: diabetes, cardiovascular disease, and schizophrenia. This research highlights that genetic predisposition exists even in individuals who may not exhibit any symptoms of these conditions.
The study examined the average human genome, revealing that it contains approximately five million variants, which are DNA differences among individuals. Among these, around 10,000 variants can alter gene sequences, potentially influencing health outcomes, from lactose intolerance to responses to medications. However, many of these variations are biologically neutral, according to the findings published in the journal Genome Medicine.
Researchers utilized data from two significant biobanks: the UK Biobank and the US-based All of Us project, encompassing nearly one million participants. Senior author Caroline Wright emphasized the growing importance of whole genome sequencing in diagnosing genetic diseases and the shift towards genetic screening for disease prediction. She noted that many individuals are unaware of the extensive genetic variation present in their genomes, which is often the norm rather than the exception.
The study also explored polygenic risk scores (PGS), which assess all known genetic factors to estimate an individual's likelihood of developing specific diseases. The researchers found that the average person is in the top 10% for nearly three conditions, with about 20% of individuals falling into the top 1% for at least one PGS. Wright stressed that while everyone carries some genetic variants associated with diseases, these do not necessarily lead to illness in every individual.
The implications of this research are significant for both healthcare professionals and patients. Understanding the context of genetic testing results, including symptoms and family medical history, is crucial for accurate interpretation. The study also highlights the need for more diverse population data to enhance the understanding of genetic risks across different demographics, as current participation is predominantly from individuals of Western European descent.
