Past studies have suggested that impaired biosynthesis could be the result of diverse mutations that hinder the foldability of proinsulin.

New York: The evolution of insulin in vertebrates — including humans — has encountered a roadblock, limiting its ability to adapt to obesity and thereby rendering most people vulnerable to Type 2 diabetes, a significant research has claimed.

Scientists from Indiana University (IU), University of Michigan and Case Western Reserve University determined that the sequence of insulin has become entrenched at the edge of impaired production — an intrinsic vulnerability unmasked by rare mutations in the insulin gene causing diabetes in childhood.

Insulin is produced by a series of highly specific processes that occur in specialised cells called beta cells.

A key step is the folding of a biosynthetic precursor, called proinsulin, to achieve the hormone’s functional three-dimensional structure.

Past studies have suggested that impaired biosynthesis could be the result of diverse mutations that hinder the foldability of proinsulin.

“Biological processes ordinarily evolve to be robust, and this protects us in the majority of cases from birth defects and diseases. Yet, diabetes seems to be an exception,” said Michael Weiss, Distinguished Professor at IU School of Medicine.

The group discovered that even the slightest variation of the insulin-sequencing process not only impairs insulin folding (and eventual insulin secretion) but also induces cellular stress that leads to beta cell dysfunction and eventually permanent damage.

The study, published in the Proceedings of the National Academy of Sciences, highlights the importance of folding efficiency as a critical but hidden factor in the evolution of insulin over the past 540 million years.

Humans have evolved to be vulnerable to diverse mutations in the insulin gene and that this vulnerability underlies a rare monogenic form of diabetes and provides an evolutionary backdrop to the present obesity-related diabetes pandemic.

“The authors highlight the fact that the insulin gene has been susceptible throughout evolution to mutations that impair insulin’s function or stress beta cells,” said Barbara Kahn from Harvard Medical School.

“As we approach the 100th anniversary of the discovery of insulin, these elegant observations might lead to a better understanding of the pathogenesis of Type 2 diabetes”.

The group will work to fully define the sequence determinants that make proinsulin foldable in beta cells.

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A handful of walnuts a day can keep many diseases at bay! As per different studies and human trials done in 11 countries by over 55 universities, walnut diet can ensure adequate fiber, protein intake as it contains vitamins and minerals, including, unsaturated fat, magnesium, phosphorus and Omega-3 alpha-linolenic acid (ALA).

Eating at least four walnuts a day will help in curing many diseases, including cancer, obesity, diabetes as well as in maintaining body weight, cognitive, reproductive health and many other lifestyle problems, according to studies.

“Walnuts are the powerhouse of nutrients for optimum health. Out of nine tree nuts, they are they only nuts that contain a significant amount of plant-based Omega-3 alpha-linolenic acid (ALA), which are essential fatty acids required by the body,” California Walnut Commission (CWC) Health Research Director Carol Berg Sloan said.

“People in India, which has huge vegetarian population, are lacking in Omega-3 and protein. So, if they consume a handful of walnuts every day or else incorporate walnuts in their meals then it is a very healthy idea,” she told PTI.

All nuts should be incorporated in daily meals as they are rich in source of monounsaturated fatty acids and walnuts in addition also contain high amounts of Omega-3 fatty acid, making it heart healthy.

With a content of 2.5 grams per ounce of ALA, the walnut is a plant-based source of Omega 3 fatty acid, which is not produced by our body but is necessary for overall wellness, she said.

The CWC said in a statement that according to studies and human trials conducted by over 55 universities in 11 countries, walnut diet can ensure adequate fiber and protein.

Walnuts are very helpful in weight management and also helps in reducing diabetes, risk of breast, colon and prostate cancer and heart diseases, she said.

According to a study by The Lancet, India has 29.8 million obese men and women.

“These days millennials are following Keto diet, in order to control or balance out their weight but following that leads to a lot of depression and there is no science involved in it,” she said.

Food has been linked with human reproductive success but most of the emphasis has been on the maternal diet and very little focus has been given to the paternal diet, Sloan said, adding that the it has been found that regular consumption of walnuts has helped improve male fertility.

Apart from health benefits of walnut kernel, its shell is also being used in variety of purposes like it is can be used as skin and foot scrub, to clean the underside of the ships and also can be used as a landscaping material, CWC’s Senior Marketing Director, International, Pamela Graviet said.

Also there is a research going, that in order to replace plastic how the shell of walnut can be used, she added.

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