systemic lupus erythematosus jenny hsu gene 210 05-22-2012
TRANSCRIPT
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Systemic Lupus Erythematosus
Jenny HsuGene 210
05-22-2012
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Outline
I. IntroductionA. SymptomsB. PathogenesisC. Who is at risk?
II. Associated SNPsA. OverviewB. rs10954213
III. Treatment
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What is Lupus?I. Autoimmune disease
immune responses intended for defense against invading microorganisms attack the body itself
II. Not fatal, but incurablefive-year survival rate: 90%20-year survival rate: 80%Characterized by periods of increased disease activity (“flares”)
III. “Great Imitator”symptoms also seen in arthritis, blood disorders, diabetes, thyroid problems, many heart, lung, muscle, and bone diseases
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SymptomsRash (90%)The most common symptom. Often brought on by sun exposure. Usually on face and scalp and can lead to hair loss (alopecia).
A.D.A.M Medical Encyclopedia
American College of Rheumatology
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SymptomsJoint Inflammation (90%)
Frequently involves hands, knees, and wrists, mimicking rheumatoid arthritis. Results in muscle weakness and loss of bone structure.
American College of Rheumatology
WebMD
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SymptomsPericarditis (80%) Lupus Cerebritis (15%)
The sac containing the heart (pericardium) becomes inflamed. May lead to chest pain, arterial thickening, and heart attack.
Inflammation of cerebrum can lead to headaches, seizures, paralysis, depression, loss of movement, and stroke.
WebMD
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SymptomsLupus Nephritis (50%) Lung Inflammation (50%)
The tissue around the lung becomes inflamed, which may lead to painful breathing, shortness of breath, or chest pain.
Inflammation of the kidney; may result in renal failure.
WebMD
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Inflammation in Immune Response
Leukocytes Leukocytes
Adapted from Lawrence et al, 2002
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Innate vs. Adaptive Response
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Adaptive Immune ResponseT cells
dendritic cell engulfs pathogen and produces antigen; presents antigen to precursor T cell
T cell differentiation
spur the growth of more T cells
infected cell
become cytotoxic
become helper T cells
B cellsantigen
antigen-specificreceptor
antigen is processed and presented to T cell
T cell activates the B cell
activated B cell produces antibodies that bind to antigens; antibody-antigen binding enhances the activity of all leukocytes
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Inflammation in Lupus
innate immune response
release of self-antigens
B cells become autoreactive and hyperactivated
T cells become autoreactive, overproduce cytotoxins
B cells overproduce antibodies
Decreased clearance of antibody-antigen complexes and immune cells
T cells and immune complexes accumulate
chronic inflammation and tissue damage
Adapted from Cooper et al, 2008
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Who Is At Risk?• Affects “reproductive-age
women” (between the ages of 20 and 40) 9 times more than men.
• After menopause, women are 2.5 times more likely than men to develop lupus.
• African Americans, Latinos, and Asians are 2-4 times more likely to develop lupus.
Pons-Estel et al, 2010
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Who Is At Risk?
• A sibling of the patient has 20 times the disease risk (2% versus 0.5-1.0%).
• Concordance rate of 24%-57% in dizygotic twins.
• 10-fold lower concordance rate of 2-5% in monozygotic twins.
Tsao et al, 2002; Deapen et al, 1992
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Outline
I. IntroductionA. SymptomsB. PathogenesisC. Who is at risk?
II. Associated SNPsA. OverviewB. rs10954213
III. Treatment
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A Complex Genetic Disease
Moser et al, 2009
SNPs of modest effect size (odds ratio 1.15 - 2.0).
Genetic factors explain 15% of heritability.
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Focus on rs10954213
Ancestral Allele Risk Allele P-Value Odds Ratio LocationG A 2.8 E-5 1.54 IRF5
The Basics(sorry for errors on Genotation!)
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G->A substitution at rs10954213AAUGAA vs. AAUAAA
IRF5
enhanced mRNA stability increased protein levels
Adapted from Graham et al, 2007
(poly-A signal)
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Effects of IRF5 overproductiondendritic cell
innate immune response
antigens
Adapted from Kyogoku and Tsuchiya, 2007
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Outline
I. IntroductionA. SymptomsB. PathogenesisC. Who is at risk?
II. Associated SNPsA. OverviewB. rs10954213
III. Treatment
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If you have risk alleles…
I. Don’t worry.Lupus is a complex genetic disease that also involves environmental and epigenetic factors
II. Avoid environmental triggersUV rays, sun-sensitizing drugs, smoking
III. Checking for signs of inflammationA. X-rays to detect fluid in chest and lungsB. Urinalysis to check protein levels in urine
IV. Autoantibody testsA. FANA assay for anti-nuclear antibodiesB. Farr assay for anti-dsDNA antibodiesMolokhia and McKeigue, 2006;
Hughes and Ul-Hassan, 2006
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Effects of SNPs on treatments
I. Currently not known II. FDA-approved:
A. Aspirin: relieve pain and swelling B. Glucocorticoids: turn down immune activityC. Hydroxychloroquine: an anti-malarial with proteolytic
effects; decreases secretion of proteins with immunological roles
D. Belimumab: blocks cytokines involved in survival of B cells
III. In clinical trials: A. Rituximab: B cell depletionB. Abatacept: block interaction between B and T cells
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Thank You!