HLA-DR1 (DR1) is a HLA- DR

serotype A serotype or serovar is a distinct variation within a species of bacteria or virus or among immune cells of different individuals. These microorganisms, viruses, or cells are classified together based on their surface antigens, allowing the epi ...

that recognizes the DRB1*01 gene products. It has been observed to be common among

centenarians A centenarian is a person who has reached the age of 100 years. Because life expectancies worldwide are below 100 years, the term is invariably associated with longevity. In 2012, the United Nations estimated that there were 316,600 living centen ...

Serology

The serology for the most common DR1 alleles is excellent. The serology for alleles , , , , , , and is unknown.

Disease associations

By serotype

DR1 is associated with seronegative-

rheumatoid arthritis Rheumatoid arthritis (RA) is a long-term autoimmune disorder that primarily affects joints. It typically results in warm, swollen, and painful joints. Pain and stiffness often worsen following rest. Most commonly, the wrist and hands are involv ...

penicillamine Penicillamine, sold under the brand name of Cuprimine among others, is a medication primarily used for the treatment of Wilson's disease. It is also used for people with kidney stones who have high urine cystine levels, rheumatoid arthritis, an ...

-induced myasthenia, and

schizophrenia Schizophrenia is a mental disorder characterized by continuous or relapsing episodes of psychosis. Major symptoms include hallucinations (typically hearing voices), delusions, and disorganized thinking. Other symptoms include social withdra ...

. DR1 is increased in patients with systemic sclerosis and arthritis and in

ulcerative colitis Ulcerative colitis (UC) is a long-term condition that results in inflammation and ulcers of the colon and rectum. The primary symptoms of active disease are abdominal pain and diarrhea mixed with blood (hematochezia). Weight loss, fever, and a ...

with patients that have articular manifestations.

By allele

DRB1*0101 is associated with rheumatoid arthritis, in anti-Jk(a) mediated hemolytic transfusion reactions, foliaceous pemphigus, HTLV-1-associated myelopathy/tropical spastic paraparesis, and

lichen planus Lichen planus (LP) is a chronic inflammatory and immune-mediated disease that affects the skin, nails, hair, and mucous membranes. It is not an actual lichen, and is only named that because it looks like one. It is characterized by polygonal, fla ...

. In lyme disease arthritis, *0101 appears to play a role in presentation of triggering microbial antigens. DRB1*0102 is associated with rheumatoid arthritis, in anti-Jk(a) mediated hemolytic transfusion reactions,

psoriasis vulgaris Psoriasis is a long-lasting, noncontagious autoimmune disease characterized by raised areas of abnormal skin. These areas are red, pink, or purple, dry, itchy, and scaly. Psoriasis varies in severity from small, localized patches to complete ...

, and recurrent respiratory papillomatosis DRB1*0103 is associated with colonic

Crohn's disease Crohn's disease is a type of inflammatory bowel disease (IBD) that may affect any segment of the gastrointestinal tract. Symptoms often include abdominal pain, diarrhea (which may be bloody if inflammation is severe), fever, abdominal distension ...

and

By genotype

DRB1*0101/*0404 and *0101/*0401 increases risk of mortality in rheumatoid arthritis, with ischemic heart disease and smoking. these same genotypes are associated with rheumatoid vasculitis.

By haplotype

DRB1*0102:DQB1*0501 is associated with

and

tubulointerstitial nephritis Interstitial nephritis, also known as tubulointerstitial nephritis, is inflammation of the area of the kidney known as the renal interstitium, which consists of a collection of cells, extracellular matrix, and fluid surrounding the renal tubules. ...

& uveitis syndrome, but is relatively protective against juvenile diabetes. DR1-DQ5 is associated with tubulointerstitial

nephritis Nephritis is inflammation of the kidneys and may involve the glomeruli, tubules, or interstitial tissue surrounding the glomeruli and tubules. It is one of several different types of nephropathy. Types * Glomerulonephritis is inflammation of th ...

uveitis Uveitis () is inflammation of the uvea, the pigmented layer of the eye between the inner retina and the outer fibrous layer composed of the sclera and cornea. The uvea consists of the middle layer of pigmented vascular structures of the eye and ...

syndrome.

Rheumatoid arthritis

DR1 are associated with rheumatoid arthritis, and while not the strongest association with the highest risk for early onset arthritis is within the DR4-bearing Native American population. There frequency of DR4-DQ8 haplotypes reach extreme nodal levels. Arthritis has been identified in a

pre-Columbian In the history of the Americas, the pre-Columbian era spans from the original settlement of North and South America in the Upper Paleolithic period through European colonization, which began with Christopher Columbus's voyage of 1492. Usually, th ...

remains from Italy, the affected individual bearing the DRB1*0101 allele. DRB1*0101 and most DR4 have in common a 'shared epitope'. In this hypothesis a common region of the beta chain, positions 67 to 74, are common and may be integral to presenting auto-immunological peptides.

Genetic linkage

HLA-DR1 is not genetically linked to DR51, DR52 or DR53, but is linked to

HLA-DQ1 HLA-DQ1 is a serotype that covers a broad range of HLA-DQ haplotypes. Historically it was identified as a DR-like alpha chain called DC1; later, it was among 3 types DQw1 (later DQ1, and split into DQ5 and DQ6), DQw2 and DQw3. Of these three ...

and DQ5 serotypes.

References

{{DEFAULTSORT:Hla-Dr1 1