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"For the first time we've found that almost every complex disease has a unique set of associations with single-gene diseases. This essentially gives us 'barcodes' of specific gene loci, which we can use to help untangle the complex genetics of complex diseases," says Andrey Rzhetsky. (Credit: Roger Gordon/Flickr)

algorithms

Genetic map helps untangle ‘complex diseases’

Scientists analyzed more than 120 million patient records to understand the genetic factors at play in complex diseases. The result is a unique genetic map.

They say the map has the potential to guide researchers and clinicians in diagnosing, identifying risk factors for, and someday developing therapies against complex diseases. The work was published in Cell.

“For the first time we’ve found that almost every complex disease has a unique set of associations with single-gene diseases. This essentially gives us ‘barcodes’ of specific gene loci, which we can use to help untangle the complex genetics of complex diseases,” says Andrey Rzhetsky, professor of genetic medicine and human genetics at the University of Chicago, who led the study.

This diagram illustrates how closely related various complex diseases are with each other. View larger. (Credit: University of Chicago)
This diagram illustrates how closely related various complex diseases are with each other. View larger. (Credit: University of Chicago)

The majority of human diseases are complex and caused by a combination of genetic, environmental, and lifestyle factors. On the other end of the spectrum are Mendelian diseases such as cystic fibrosis and sickle-cell anemia, which are caused by abnormalities to a single gene. Some Mendelian disorders are known to predispose patients to certain complex diseases, but these co-occurrences have thus far only been studied on a small-scale basis.

120 million patients

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To expose any underlying shared genetic structures between these disease categories, Rzhetsky and his team developed computational algorithms to parse more than 120 million patient billing records from hospitals systems across the US and from nearly the entire population of Demark.

They looked for trends in comorbidity, or the occurrence of both complex and Mendelian disease in the same patient, that were higher than expected from random chance. They studied these correlations in 65 complex diseases affecting almost every system in the body, including arthritis, depression, and lung cancer, and in 95 Mendelian disease groups (representing 213 disorders).

The team uncovered 2,909 statistically significant associations, as well as corresponding levels of relative risk between every disease pair. Some comorbidities were well known, such as the strong link between lipoprotein deficiencies and heart attack, but the vast majority were previously unknown.

For example, Marfan syndrome, a connective tissue disorder, was found to have significant comorbidities with neuropsychiatric diseases such as autism, bipolar disorder, and depression. Fragile X syndrome, an intellectual disability disorder, has significant associations with asthma, psoriasis, and viral infection, highlighting a potential immune system dysfunction in these patients.

“Since the Mendelian diseases are associated with known genetic loci, we have essentially created a genetic map for complex disease using Mendelian disorders as markers,” says David Blair, a graduate student at the University of Chicago and first author on the study. “These loci represent great candidates for uncovering subtle genetic variations, some which might not directly cause Mendelian disease but still impact the risk for developing complex diseases.”

This genetic map is immediately useful for geneticists and clinicians as a gauge to the level of risk of developing complex disease among their patients with Mendelian diseases. But it also gives scientists a wealth of new data and a unique approach by which to better understand and develop therapeutics against complex diseases.

The team also discovered that genetic insults underlying Mendelian diseases do not appear to independently contribute to complex diseases but likely interact in a combinatorial way to ultimately cause the disorders.

“Individuals with multiple Mendelian disease-causing genetic variants end up having a much higher risk for a complex disease than we would predict given that the variants act in isolation,” Blair says.

The team hopes to expand their study to even more diseases and larger population data and to compare their predictions against the whole genome data of a broad population. “Our work has the potential to open many new avenues of future research for complex diseases,” Rzhetsky says.

The National Institutes of Health and a Lever Award from the Chicago Biomedical Consortium supported the research.

Source: University of Chicago

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