Low birth weight ups type 2 diabetes risk: study
Posted June 27th, 2016, 12:01 PM IST
Researchers from Tulane University in the US conducted the study on 3,627 type 2 diabetes cases and 12,974 controls of European ancestry.
They created a genetic risk score (GRS) based on five low birth weight-related genetic variations known as single nucleotide polymorphisms (SNPs).
The analysis showed that for each one point increase in GRS (with the score ranging from 1-10), the risk of developing type 2 diabetes increased by six per cent, researchers said.
Using a statistical technique called Mendelian randomisation, they further found evidence that the low birth-weight was actually causing the excess risk in type 2 diabetes.
This type of analysis, is, researchers said, a new approach for establishing causal relationships in studies of this nature.
"Evidence from both population and experimental studies has suggested that restricted early life development has long-term structural and functional influence on individuals' predisposition to an increased risk of metabolic diseases such as type 2 diabetes," researchers said.
"However, to our knowledge, this study is the first to investigate the potential causal relation between low birth-weight and risk of type 2 diabetes," they added.
Since low birth-weight represents restricted intrauterine growth (foetal growth), it cannot be ruled out that it is in fact the risk factors for this restricted growth that are causing the low birth-weight and in turn causing type 2 diabetes to develop, researchers said.
Risk factors for restricted intrauterine growth include malnutrition, anaemia, infections and placental insufficiency, they said.
Researchers found that a genetically lowered birth weight was associated with increased susceptibility to type 2 diabetes.
"Our findings support a potential causal relation between birth weight and risk of type 2 diabetes, providing novel evidence to support the role of intrauterine exposures in the pathogenesis of type 2 diabetes," researchers said.
The findings were published in the journal Diabetologia.
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