Approximately 50% of the variation in sleeping disorder symptoms can be pinned on genetic factors.
The study also did not account for genetic factors and family history of obesity.
She said the increase was too steep to be put down to genetic factors alone.
"Possible factors might be nutritional factors other than folate, metabolic factors, genetic factors, " she said.
The genetic factors behind drug response could turn out to be too complex to identify.
Experts speculate that a combination of early, high-quality therapy and biological and genetic factors are likely responsible.
There are three possible explanations for the problem - poor social circumstances, maternal health or genetic factors.
Patients can be tested for these genetic factors to ensure that clopidogrel is the right choice for them.
FORBES: FDA Approves Generic Clopidogrels As Plavix Loses Patent Protection
No genetic factors for females have been found, and no environmental associations have been identified for either gender, Kraft said.
Dr Alison Brind, consultant physician at the City General Hospital in Stoke is also heading research into genetic factors in alcohol-related liver disease.
Though lifestyle or genetic factors may be involved, Van Horn notes this group proves that extremely low sodium intakes can support a healthy body.
As sequencing technology advances and becomes more affordable, researchers expect someday to readily decode twins' full genomes to further identify genetic factors of diseases.
WSJ: Twins Health Registry Is Treasure Trove for Medical Research
Genetic factors are also being checked and tissue samples are being taken from patients with tumours to build up a tissue database for further research.
So far, "the studies establish that genetic factors taken as a whole are at least moderately correlated with things like attitudes towards risk or altruism, " says Dr. Cesarini.
WSJ: Twins Health Registry Is Treasure Trove for Medical Research
If parents exhibit a tendency to treat identical twins more similarly than fraternal ones, for instance, then what researchers see as genetic factors could turn out to be environmental ones.
Prof Dominiczak said she believed there was a "very strong chance" that genetic factors played a big part in Scotland's appalling health record, with the country leading heart disease league tables.
BBC: NEWS | UK | Scotland | Glasgow and West | Medical mission seeks volunteers
Let's start with two related questions: If early biological and genetic factors beyond the individual's control make some people more likely to become violent offenders than others, are these individuals fully blameworthy?
Clopidogrel has a boxed warning to alert health care professionals and patients that the drug may not work well for those with certain genetic factors that affect how the body metabolizes the drug.
FORBES: FDA Approves Generic Clopidogrels As Plavix Loses Patent Protection
One finding of this technique, which is known as genome-wide complex-trait analysis, is that many of the same genetic factors seem to explain why people differ in intelligence in childhood and old age.
It was more common for identical twins to both have Alzheimer's compared to non-identical, and a statistical analysis of risk rates in the groups gave the researchers their estimate of how significant genetic factors are.
Then came a breakthrough in 2007, when Shinya Yamanaka of Kyoto University succeeded in reprogramming adult skin cells back to their embryonic state simply by dousing them in a concoction of four genetic factors and some growth media.
The long held belief that adults who are unable to quit smoking is ultimately related to duration of smoking may potentially be replaced by such research showing that there are specific genetic factors which could influence teen smokers to become heavy smokers throughout their lives.
FORBES: Genetic Factors Linked to Smoking Addiction in Teens
However, there are a few noteworthy exceptions - for example, age-related macular degeneration - where the genetic risks explain a substantial proportion of the disease and which , when combined with other non-genetic factors, might be able to accurately identify individuals who will develop the disease in future.
There are turning out to be precious few genetic risk factors for common diseases that have a major impact on an individual.
FORBES: A Reality Check On Forbes' Outrageous Prediction Of A $100 Billion DNA Industry
Autism, attention deficit-hyperactivity disorder, bipolar disorder, major depressive disorder and schizophrenia all share several genetic risk factors, according to a major study.
The findings illustrate the potential for a new era of genomic medicine, in which drug regimens are tailored to fit a person's genetic risk factors.
Too often, purported genetic risk factors end up being red herrings like the infamous white van in the Washington, DC car sniper case a few years ago.
Big Blue is hooking up with DeCode (nasdaq: DCGN - news - people ) in a pioneering three-year deal to jointly sell an integrated computer system that combines DeCode's unique gene-mining software, which sleuths out genetic risk factors for diseases, with IBM's (nyse: IBM - news - people ) servers and database software.
In addition, they said other genetic and environmental factors play their part, shown by the fact that thin people can also carry the genetic mutations.
Studies do show that you can absolutely overcome genetic and familial factors to lose weight.
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