Genomic switches can predispose an individual to one set of autoimmune disorders but protect the same person against another set of them, scientists at Stanford University School of Medicine have found.
"Maybe we should stop considering all autoimmune diseases in one lumped category," said Atul Butte, MD, PhD, assistant professor of pediatrics and of biomedical informatics and director of the Center for Pediatric Bioinformatics at Lucile Packard Children's Hospital. "It looks as if there may be at least two different kinds."
Pairs of autoimmune diseases have been linked in clinical practice, Butte said. People with type-1 diabetes are routinely screened for autoimmune thyroid disease, for which they are known to be at heightened risk. But no one has ever known why.
A study to be published online Dec. 24 in PLoS-Genetics provides a genetic basis for this clustering effect, while extending it to show how two such clusters tend to be mutually exclusive. Butte, who is the study's senior author, and his colleagues looked at data from several large genome-wide association studies of single-nucleotide polymorphisms, or SNPs: tiny genomic variations that constitute the genetic underpinning for inter-individual human differences from eye color to nose shape to personality quirks.
The human genome can be thought of as a 3-billion-unit-long sequence, with each unit consisting of one of four different chemical residues. At almost every specific location along two different people's genomes, the resident chemical unit is the same. But at about one or two out of every 1,000 positions, the first person's genome may boast one variety of chemical unit, while the second's hosts another type. This single-unit difference is a SNP (pronounced "snip").
There are several million SNPs in the human genome, making for a gigantic number of possible different versions of a human being, said the study's lead author, Marina Sirota, a fourth-year PhD student under Butte's supervision in Stanford's Biomedical Informatics Program. In so-called genome-wide association studies, SNPs linked to disease susceptibility are found by assessing genomes from two large groups of people, one composed of patients with, say, rheumatoid arthritis or heart disease and another of people without the condition. If, at a given SNP location, the frequency of one particular chemical unit is significantly greater or smaller among the diseased people than in the healthy ones, that SNP is presumed to lie close to or within a biologically important genomic region that increases or diminishes genetic susceptibility to the disease, Sirota said.
In the past few years the industrial-scale characterization of SNPs has been hugely enhanced by sophisticated electronic devices called gene chips, pioneered at Stanford about a decade ago. Gene chips can quickly scan an individual's genome to identify the chemical unit occupying each of more than a million SNP locations.
"More than 400 genome-wide association studies have been published since gene-chip technology took off a few years ago," said Butte. From these published studies, Sirota, Butte and their colleagues culled about a half-dozen that had been conducted on patients with or without autoimmune diseases including type-1 diabetes, rheumatoid arthritis, multiple sclerosis, autoimmune thyroid disease and a spinal condition called ankylosing spondylitis. The investigators restricted their attention to SNPs that were examined in all the studies they were focusing on.
That worked out to 573 SNPs. Of those, the researchers found 15 SNPs for which having a particular chemical unit at that site predisposed an individual to several autoimmune diseases.