Identical twins are a rare breed. They share just about everything including the genes. No wonder people cannot tell them apart. However a surprising thing is that sometimes disease strikes only one twin when it should realistically strike both of them.//
Scientists at the University of Michigan Medical School have studied twins extensively and are in a position to know why one twin is more prone to develop diseases like rheumatoid arthritis.
U-M researchers have discovered three genes that are over-expressed in rheumatoid arthritis, or RA, that were not known to be associated with the disease before. They also found that non-genetic factors influenced the expression of these genes and that the expression patterns varied between identical twins where only one twin had RA. Results of the U-M study were published in the July issue of Arthritis and Rheumatism.
RA is a chronic inflammatory disease that damages joints. RA causes pain, loss of movement, and bone deformities. It affects 2.1 million Americans. There are many genetic factors that put people at a high-risk for developing RA, yet only 15 percent of identical twins will both develop it.
Scientists compared gene expression patterns of 11 pairs of monozygotic twins, who shared the same egg and were genetically identical, but only one of them had RA. They found three new genes that were significantly over-expressed in the twin with RA compared to the one without the disease. This is the first report for RA that examines gene expression patterns in monozygotic twins.
"This is the crux of the issue we are trying to address in RA -- how two patients can have the same genes but different disease outcomes. Identical twins represent the best experimental system to address this question," says Joseph Holoshitz, M.D., an associate professor of internal medicine at U-M Medical School and co-author of the study.
The advantage of studying twins is that they start out Page: 1 2 3 Related medicine news :1
. Different Sun Rays, Different Damage2
. Heart Attack Symptoms Different in Women3
. The Cause Of Visual Problems Different From Race To Race 4
. Different Drug May Help Children With Duchenne Muscular Dystrophy5
. Learning Just How Different We Are 6
. Different Types Of Multiple Sclerosis May Be Treated Differently7
. Have You Ever Wondered How We Perceive Different Sounds?8
. Resident Physicians Need More Preparations To Treat Patients From Different Cultures9
. Differentiated Thyroid Carcinoma Can Widely Infiltrate The Larynx 10
. Men Use Their Brain Differently From Women11
. Alcohol Is Responsible For 60 Different Diseases