Here is some specific info re HLA DQ4:

HLA-DR4 Rheumatoid arthritis, Sjögren's syndrome, Giant Cell Arteritis, Lyme arthritis

http://www.arthritis.org/conditions/...ra_genetic.asp

http://www.uni-duesseldorf.de/dgfi2000/abstract/x10.htm

http://www.rheumatology.org/public/f...s/heredity.asp