inherited eye disease in children
DESCRIPTION
Matthew Weed, MD Ophthalmic Genetics Fellow, University of IowaTRANSCRIPT
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INHERITED EYE DISEASES IN CHILDRENMatthew Weed, MDOphthalmic Genetics FellowUniversity of Iowa
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Disclosures• I have no financial interest to disclose
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Outline• Comparison of inherited eye disease then and now• Eight sample cases• Brief summary of recent exciting developments
Key Points• Most of these conditions progress very, very slowly• Clinical skill + genetic testing allows accurate diagnoses• Hope is here and incredible things are happening• Don’t tell these patients there is nothing that can be done
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In the Past…• Relatively little was known about these diseases• No cures• Patients were often told “There’s nothing we can do”
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…Now• A tremendous amount is
known about these conditions• And more is being learned
every day• Effective treatments are being
dreamed up and developed• The future is extremely
bright• Patients with an inherited
eye disease should neverbe told there is nothing that can be done.
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Case # 1• Healthy 10-year-old boy referred after failing school vision• No affected family members• VA: 20/80 OD, 20/63 OS• Small central scotoma OU on visual field testing
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Dominant Optic Atrophy• Presenting Symptoms
• Gradual central vision loss in a school-age child
• Abnormal color vision• Clinical Signs
• Subnormal acuity (20/30-20/200)
• Subtle visual field abnormalities
• Pallor of optic nerve head (classically temporal half)
• Healthy retina
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Dominant Optic Atrophy• Genetics/Inheritance
• OPA1 mutations• Autosomal dominant with variable expressivity
• Systemic Features• None
• Prognosis/Treatment• Slowly progressive in up to 50% of cases• Genetic counseling• Supportive therapy
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Case #2• Healthy 6-year-old boy referred for decreasing vision• Had normal vision until age 5, started to have trouble• VA 20/60 OD and OS at age 5• 3 months later 20/100 OD, 20/125 OS• Now (3 more months later), 20/200 OD, 20/200 OS
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Batten Disease• Presenting Symptoms
• Progressive loss of previously normal visual acuity OU over the course of months beginning at age 5-7
• Followed by cognitive decline – but not till after age 10
• Clinical Signs• Progressive acuity loss• Arteriolar narrowing• Bull’s eye maculopathy• Flattening of ERG
Age Visual Acuity<5 Normal5 20/60
5.5 20/1006 20/200
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Batten Disease• Genetics/Inheritance
• CLN3 mutations• Autosomal recessive
• Systemic Features• Initially…none!• Cognitive decline, speech problems, behavior problems, seizures
follow
• Prognosis/Treatment• Visual acuity drops to counts fingers steadily and rapidly• Fatal by age 20-30• CellCept has shown some promise in slowing progression• Genetic counseling – preimplantation genetic testing• Near future: gene therapy
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Case #3• 5-month-old girl referred for abnormal eye appearance
and abnormal visual behavior• Parents aren’t sure what she can see• Unable to fixate and follow• Nystagmus• Iris transillumination defects OU
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Aniridia• Presenting Symptoms
• Poor visual acuity (often <20/200)
• Light sensitivity• Abnormal iris appearance
• Clinical Signs• Partial or complete lack of iris• Foveal hypoplasia• Glaucoma• Corneal pannus
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Aniridia• Genetics/Inheritance
• PAX6 mutations• May be autosomal dominant• May be spontaneous
• Systemic Features• WAGR: Wilm’s tumor, aniridia, genitourinary abnormalities, mental
retardation
• Prognosis/Treatment• If there is no family history, referral for renal evaluation• Variable prognosis depending on severity• Supportive care (sunglasses), management of glaucoma
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Case #4• 14-year-old female referred for several years of declining
vision• Multiple affected family members including brother• She was seen 2 years prior, found to have 20/25 vision,
normal-appearing retina• 20/160 OD, 20/160 OS
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Stargardt Disease• Presenting Symptoms
• Subnormal vision at age 7-20 (or later)
• Often labeled as functional vision loss
• Clinical Signs• Subnormal acuity (range from
20/25-20/200)• Yellow pisciform flecks• Peripapillary sparing• Vermillion fundus
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Stargardt Disease• Genetics/Inheritance
• ABCA4 mutations• Autosomal recessive
• Systemic Features• None
• Key Differential Diagnosis• Batten disease (especially if age 4-8 with vision loss and visible macular lesion)
• Prognosis/Treatment• Variable prognosis• If vision drops to 20/50, typically it will progress to 20/200 within 5 years, then hold• Vitamin A supplements are harmful, not helpful• Safety glasses/avoidance of contact sports, as retina is extra sensitive to trauma• Genetic counseling – preimplantation genetic testing• Gene therapy
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Case #5• 4-month-old healthy female with inability to “follow faces
well”• Able to fixate and follow light OD and OS• Nystagmus OU• Non-recordable electroretinogram (ERG)
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Leber Congenital Amaurosis• Presenting Symptoms
• Very poor vision from birth
• Clinical Signs• Very poor visual acuity• Nonrecordable ERG• Nystagmus• Relatively healthy-appearing
retina
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Leber Congenital Amaurosis• Genetics/Inheritance
• 17 known causative genes (RPE65, CRB1, CRX, NPHP6…)• Autosomal recessive
• Systemic Features• Sometimes present, sometimes not• Can be associated with kidney disease (nephronophthisis)• Joubert syndrome (ataxia, breathing problems, poor muscle tone)
• Prognosis/Treatment• A stable condition• Genetic counseling – preimplantation genetic testing• Gene therapy
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Leber Congenital Amaurosis• Gene therapy
• For LCA caused by mutations in the RPE65 gene, gene therapy clinical trials have been performed in humans
• A “correct version” of the RPE65 gene is placed into a virus, and this virus is injected underneath the patient’s retina
• The virus carries the gene into the patient’s retina cells, which incorporate the corrected gene and start using it to make the correct protein
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Gene Therapy
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Gene Therapy
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Treatment for Leber Congenital Amaurosis
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Treatment for Leber Congenital Amaurosis
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Case # 6 • 11-year-old male referred for decreased vision OU• Unable to see 20/20 since 3rd grade• 4 siblings (2 boys, 2 girls), all with normal vision• 20/60 OD and OS
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X-Linked Retinoschisis• Presenting Symptoms
• Poor central vision
• Clinical Signs• Decreased acuity• “Spoke-wheel” fovea• Characteristic OCT• “Electronegative ERG”
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X-Linked Retinoschisis• Genetics/Inheritance
• RS1 gene• X-linked
• Systemic Features• None
• Prognosis/Treatment• Slowly progressive• Good outcomes with topical carbonic anhydrase inhibitors
• E.g. dorzolamide or brinzolamide
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X-Linked Retinoschisis
VA 20/60
VA 20/40
Brinzolamide 3 times daily
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Case #7• 19-year-old male referred for one year of decreased
peripheral vision only present in dim lighting conditions• Both older siblings, and their father, have been having
similar problems• 20/15 OD, 20/25 OS
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Retinitis Pigmentosa• Presenting Symptoms
• Night blindness• Glare• Peripheral vision loss
• Clinical Signs• Waxy pallor of optic nerve• Attenuated arterioles• Bone-spicule-like
pigmentation in retina• Ring scotoma on visual
field testing
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Retinitis Pigmentosa
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Normal Visual Field (right eye)
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Sample Visual Field in Retinitis Pigmentosa
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Retinitis Pigmentosa• Genetics/Inheritance
• 70% autosomal recessive (USH2A)• 15% autosomal dominant (rhodopsin)• 15% X-linked recessive (RPGR)
• Systemic Features• Occasionally present• Usher syndrome: RP, deafness, balance problems• Bardet-Biedl syndrome: RP, obesity, extra digits, developmental delay,
cardiac/renal/genital disorders
• Prognosis/Treatment• Stable or very slowly progressive• Genetic counseling• Future: gene therapy if disease is still early• Future: stem cell treatment if disease is more advanced
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Case #8• 14-year-old boy with a known inherited eye disease, and
multiple affected family members• Referred for evaluation of sudden visual decline OD 1
week ago• Vision had previously been 20/15 OD and OS
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Best Disease• Presenting Symptoms
• Mildly decreased vision• Often asymptomatic
• Clinical Signs• Acuity as good as 20/20• Single, symmetric, yellow,
ovoid lesion in central macula OU
• “Vitelliform” lesion• May develop retinal
hemorrhage from trauma or choroidal neovascularization
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Best Disease• Genetics/Inheritance
• Best1 mutations• Almost always autosomal dominant
• Systemic Features• None
• Prognosis/Treatment• Very slowly progressive• Excellent acuity often preserved for many decades• Surveillance for retinal bleeding from choroidal neovascularization• Genetic counseling• Supportive therapy• Future: gene therapy
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Best Disease – Back to our Patient20/160ObservationReturn in 1 week, then 2 weeks, then 3 weeks
20/125Avastin intravitreal injectionRepeated 1 month later
20/20Observation
3 months later
6 weeks later
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Genes which have been replaced in animal models showing some efficacy• LCA--RPE65 (mice, dogs, humans)• LCA—GUCY2D (mice)• LHON--ND4 (mice)• Achromatopsia—CNGA3 (mice)• BBS4 (mice)• BBS1 (mice)• RP—Rho—mice• RP—PDE6Beta—mice• Stargardt—ABCA4 (humans, mice)• Usher 1b—Myo7a (mice, humans)• RP--CNGB1 (mice)• CNV—AAV-anti-VEGF shRNA
(mice)
• AMD—EIAV-endostatin/angiostatin(monkey, rabbit)
• LCA—MERTK (rats, humans)
• XLRP—RPGR (dogs)• Choroideremia—
CHM/REP1 lentivirus(mice)
• Neovascular diseases—Flt-1 receptor (non-human primates)
• ADRP—GCAP1 siRNA(mice)
• Achromatopsia—CNGB3 (mice)
• Usher 2D (mice)
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Stem Cells• Cells that haven’t decided what they’re going to do• Found in every embryo• Growth factor molecules make them turn into different
types of tissue in the human body
• After many years, patients with severe retinal diseases essentially have no functioning retina cells left
• Wouldn’t it be nice if we could give them a new retina?• We could use stem cells – turn them into retina – and
transplant them into the patient• Where do we get the stem cells?
• No longer has to be from embryos!
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Induced Pluripotent Stem Cells: Turning a Patient’s Own Skin Cells into Retina
Keratinocytes Stem cells
Yamanaka factors
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The stem cells are then incubated with a succession of different media to drive the cells towards becoming retina tissues
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45 days 70 days 150 days
200 µm 200 µm 1 cm
90
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Neurosensory Retina
RPE
400 µm
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Thank You