Genetic Risk Of Obesity In Indians Differs From Europeans: Study Reveals Why Lifestyle Changes Work Better
Many gene variants previously associated with obesity in Europeans do not affect Indians similarly, which resonates with a different pattern of obesity in Indians, according to the findings of the study by researchers at Centre for Cellular and Molecular Biology under Council of Scientific and Industrial Research (CSIR-CCMB), Hyderabad.
The study also revealed that Polygenic Risk Score (PSR) predicts obesity more accurately in people with European-like ancestry than in those with other ancestries, including Indians (South Asian ancestry)
Researchers at CSIR-CCMB, led by Dr Giriraj Ratan Chandak, characterised the genomes of the Indian population. They included individuals with diabetes as well as those with normal blood glucose levels, who have been followed for nearly 20 years, providing a unique opportunity to investigate the genetic basis of obesity in Indians.
Obesity is a grave problem in India and other parts of South Asia, given their incidences of diseases like diabetes, hypertension, and cardiovascular diseases. The pattern of obesity in India is notably different from that in Europe, with Indians tending to have more central (abdominal) obesity.
Several obesity-associated genetic changes were identified and used to develop the PRS for Indians, effectively creating a 'virtual individual' to model obesity risk. This data from Indian samples has served as a representative for the South Asian population in the study. Through this data, the study's findings become more relevant for the Indian and South Asian populations.
The scientists also examined the connection between a person's genetic risk of obesity and the impact of lifestyle weight loss interventions, such as diet and exercise. They discovered that individuals with a higher genetic risk of obesity responded better to interventions but also regained weight more quickly once the interventions ended.
'The observations made from this study are similar to the earlier results on height, where genetic variants identified in Europeans predicted lower risk in Indians, and environment-related modifications of genes play a larger role. It looks like lifestyle, diet and nutrition might be playing an equal or more important role in predicting obesity in Indians. So, for Indians, lifestyle solutions or specific nutrient supplementation in the background of genetic risk might yield better results,' said Dr Chandak.
Earlier studies by Dr Chandak showed that the genetic basis of non-communicable diseases varies significantly between Indians and Europeans.
The latest study by researchers at CSIR-CCMB is part of a global study. An international team of 600 researchers across 500 institutions drew on the largest and most diverse genetic dataset ever, including genetic data from the GIANT consortium and consumer DNA testing firm 23andMe. This provided access to genetic information from over 5 million people from different countries, including India.
Using this data, the researchers developed a genetic test called PRS that predicts adulthood obesity in early childhood. This discovery could help identify children and adolescents already at higher genetic risk of developing obesity, who could benefit from targeted preventative strategies such as lifestyle interventions at a younger age. This score is twice as effective as the previous best test at predicting a person's risk of developing obesity.
'What makes the score so powerful is its ability to predict, around the age of five, whether a child is likely to develop obesity in adulthood, well before other risk factors start to shape their weight later in childhood. Intervening at this point can have a huge impact,' says Assistant Professor Roelof Smit from the NNF Centre for Basic Metabolic Research (CBMR) at the University of Copenhagen and lead author of the research that was published in the journal Nature Medicine.
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