Celiac.com 06/17/2013 - To investigate the prevalence of human leukocyte antigen (HLA) DQ2/8 alleles in Southern Italians with liver and gastrointestinal (GI) diseases outside of celiac disease, a team of researchers recently looked at human leukocyte antigen DQ2/8 prevalence in non-celiac patients with gastrointestinal diseases.
The team assessed HLA DQ2/8 status in 443 patients from three ambulatory gastroenterology clinics in Southern Italy. The clinics were located at the University of Federico â…¡ and Loreto Crispi Hospital in Naples, and Ruggi D’Aragona Hospital in Salerno.
The team grouped patients according disease status for pre-post transplant liver disease, esophageal/gastric organic and functional diseases, irritable bowel syndrome (IBS) and inflammatory bowel disease (IBD), along with DQ2/8 alleles, which correspond to a celiac disease genetic risk scale.
They then compared allele frequencies in the test subjects with healthy Italian control subjects. Out of 443 subjects, the team found that 196 subjects (44.2%), tested positive for DQ2/8. The average age of DQ2/8 positive subjects was 56 years, and 42.6% were female.
Overall, the team found that 86/188 (45.7%) patients with liver disease were HLA DQ2/8 positive, 39/73 (53.4%) with functional upper GI diseases and 19/41 (46.3%) with organic upper GI diseases were positive.
Moreover, 38/105 (36.2%) patients with IBS and 14/36 (38.9%) with IBD were HLA DQ2/8 positive (P = 0.21). Additionally, people with functional upper GI diseases disorders had rates of DQ2/8 positivity that were nearly double those of healthy control subjects. Those with liver disease had rates of DQ2/8 positivity that were 1.3 percent higher than controls, though this rate is not statistically significant. People with IBS and IBD had a lower rates of DQ2/8 positivity compared to healthy controls.
Compared to general population estimates, the percentage of individuals who were HLA DQ2/8 positive is higher in those with liver/upper functional GI disease and lower in IBS/IBD.