Health news

Researchers find cause of new autoinflammatory disease

Researchers found that mutations in a specific gene cause a previously unknown autoinflammatory disease, which they’ve named CRIA syndrome. Inhibitors targeting the gene’s effects could lead to new treatments for CRIA syndrome and other inflammatory conditions. USA. 18th January 2020. Autoinflammatory diseases are caused by the immune system—the body’s disease defense that fights off viruses, bacteria, and infection—attacking your body by mistake. That can cause a fever, rash, muscle aches, joint and other tissue swelling, and organ problems. Members of three families came to NIH’s Clinical Center with symptoms similar to those caused by an autoinflammatory disease, but with no known cause. The seven patients ranged from 10 to 82 years old. Their symptoms included fevers, swollen lymph nodes, severe abdominal pain, gastrointestinal problems, headaches and, in some cases, abnormally enlarged spleen and liver. Although their condition isn’t life-threatening, they can have persistent fever and swollen lymph nodes from childhood to old age, as well as other symptoms that can lead to lifelong pain and disability. A team of researchers led by Dr. Daniel Kastner of NIH’s National Human Genome Research Institute (NHGRI) and Dr. John Silke at the Walter and Eliza Hall Institute in Australia carried out a study looking for the cause of the syndrome. After ruling out infections and cancer, they sought answers by genomic sequencing. The study, which was funded by several NIH components, was published on January 2, 2020, in Nature. The team discovered only one gene—RIPK1—that was consistently different in all patients. Each of the three families had its own unique mutation affecting the very same DNA letter in the RIPK1 gene. Each affected person had one mutant and one normal copy of the gene, while unaffected family members had two normal copies. The protein encoded by the RIPK1 gene is involved in inflammation and programmed cell death—the process by which old cells die so they can be replaced by new ones. Each of the patients’ mutations occur at the location where RIPK1 can be cleaved to prevent it from initiating inflammation and cell death. Thus, Kastner’s team named the disease cleavage-resistant RIPK1-induced autoinflammatory,…