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Congenital Aniridia Congenital Aniridia JOCGP 10.5005/jp-journals-10008-1086 REVIEW ARTICLE Congenital Aniridia Congenital Aniridia Dewang Angmo, Bhaskar Jha, Anita Panda Glaucoma Services, Dr RP Center for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi, India Correspondence: Anita Panda, Glaucoma Services, Dr RP Center for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi, India, e-mail: [email protected] ABSTRACT Aniridia is a rare bilateral condition that may have life-threatening associations. It occurs as a result of abnormal neuroectodermal development secondary to a mutation in the PAX6 gene linked to 11p13. This gene controls the development of a number of structures, hence the broad nature of ocular and systemic associations.This article presents a review of congenital aniridia including epidemiology, genetics, clinical features, ocular and systemic associations and management modalities. Keywords: Aniridia, Subluxation, Glaucoma filtering surgery, PAX6 gene. INTRODUCTION Mortality/Morbidity: All patients with aniridia are visually Aniridia (Greek, absence of iris) is an uncommon hereditary handicapped for their whole life. Complications like cataract bilateral congenital, panocular disorder affecting not only the and glaucoma reduce the vision furthermore. The patients with iris but also the cornea, anterior chamber angle, lens, retina, Wilms’ tumor have a reduced span of life. Aniridia itself is not and optic nerve as well with life-threatening associations.6 Its a lethal disorder. However, miscarriages and a stillborn child first description was given by Barrata in 1818.1 It is charac- have been the only results of a consanguineous mating between terized by profound hypoplasia of the iris (Figs 1A and B) in individuals with aniridia. It is possible that a homozygous frequent association with multiple ocular anomalies, such as mutation of the aniridia gene may be lethal. The morbidity of peripheral corneal pannus and keratopathy, foveal hypoplasia, aniridia is significant because of the decreased vision and diffuse retinal dysfunction as seen on electroretinography, nystagmus. impaired acuity with nystagmus, cataract and ectopia lentis and Genetics: Aniridia can occur as the following: optic nerve hypoplasia.7 These defects, in combination, usually cause a formidable barrier to normal visual function. • Autosomal disorder: Dominant and recessive Often, the iris is vestigial (little more than a margin is • Deletion of the short arm of chromosome 11, including band present) and the eye appears to have colorless (only a larger p13 than normal) pupil. It may be associated with systemic defects • Sporadic case. consisting of mental retardation, genital anomalies and Wilms’ In the majority of cases with familial inheritance, an tumor.1 autosomal dominant inheritance pattern with almost complete Epidemiology: Incidence reported from studies are 1:64,000 penetrance has been demonstrated.1 However, variations in to 1:96,000.1,2 Pedigree analyses have shown that two-thirds expression have also been seen to occur. Rarely, it may be of children with aniridia have an affected parent.1,3 transmitted in an autosomal recessive manner.4,5 Consanguineous Figs 1A and B: (A) The peripheral iris rim and a clear view of the lens equator, (B) total aniridia with inferiorly subluxated lens Journal of Current Glaucoma Practice, May-August 2011;5(2):1-13 1 Dewang Angmo et al Table 1: Classification of aniridia aniridia is unknown. Because the iris pigment epithelium, the iris musculature, the retina, and the optic nerve are derived AN-1 is autosomal dominant, accounts for 66% of cases and has no from neuroectoderm, there may be a common embryologic systemic implications. Penetrance is complete, but expressivity origin for these anomalies. The pathogenesis may involve variable. defective formation or excessive regression of various layers AN-2 (Miller syndrome) is sporadic and accounts for 33%. It carries of the anterior segment caused by cellular or biochemical 30% risk of Wilms’ tumor developing before the age of 5 years. aberrations. This explains the combined anterior and posterior AN-3 (Gillespie syndrome) is autosomal recessive and accounts for the remainder. It is associated with mental handicap and cerebellar segment, neural ectodermal and mesenchymal defects. The iris ataxia. stroma is hypoplastic, indicating an altered third neural crest wave of mesenchyme. marriages have also been implicated in some studies.30 Of the Clinical Presentations sporadic cases of aniridia, two-thirds represent a new autosomal dominant condition. Regarding racial predisposition it has been 1. Aniridia alone 2. Aniridia with other systemic abnormalities seen that it does not exist. • Wilms’ tumor (20% cases) As an isolated ocular malformation, aniridia is an autosomal • Genitourinary abnormalities dominant disorder, which is caused by a mutation in the PAX6 • Mental retardation (paired box gene family) gene. 3. Aniridia with other ocular disorders Patients with aniridia who have a positive family history • Albinism are not at an increased risk for Wilms’ tumor. Two genetic loci • Ectopia lentis (50%) for aniridia have been identified: one (AN1) on chromosome • Spontaneous lens dislocation arm 2p and one (AN2) on chromosome 11 (Table 1). • Arcus juvenilis • Keratoconus Miller Syndrome (WAGR Complex, 11p Syndrome) • Cataract (50-85%) The association between aniridia and Wilms’ tumor is referred • Glaucoma (30-50%) to as Miller syndrome. Approximately 30% of patients with • Nystagmus sporadic aniridia develop Wilms’ tumor, usually before age 5 • Strabismus years. It is reported that 1.4% of patients with Wilms’ tumor • Optic nerve hypoplasia (75%) have aniridia compared to one in 64,000 to one in 100,000 of • Pupillary membrane remnants. Age: The age at presentations is generally infancy when the the general population. Other associated features are parents notice abnormally large pupil. Sometimes they may genitourinary abnormalities, craniofacial dysmorphism, also complain poor vision and photophobia in early childhood hemihypertrophy and severe mental retardation. These patients along with nystagmus. Congenital glaucoma and aniridia usually also have poorly lobulated low-set ears, prominent noses, and are not associated at birth. The glaucoma develops at either the long narrow faces. The acronym WAGR (Wilms’ tumor, preteen or the teenage level. aniridia, genitourinary anomalies and mental retardation) Significant cataracts may occur before puberty. The risk describes some of the features of Miller syndrome. for cataract increases with age with lens opacities observed in Miller syndrome has been attributed to a deletion of band 50 to 85% of patients during the first two decades of life. 11p13. Patients with sporadic aniridia should undergo a The clinical presentations/features are discussed one by one: thorough physical examination and work-up by a family practitioner or pediatrician. Decreased Vision It is the most common symptom of the aniridia. Many series Gillespie Syndrome report that as many as 86% of affected individuals have 20/ Gillespie syndrome is the association of aniridia, cerebellar 100 vision or worse in the better eye. ataxia and mental retardation. It is autosomal recessive, The causes of poor vision are: occurring in approximately 2% of patients with aniridia. These • Foveal hypoplasia patients have anatomical defects in the cerebellum and other • Cataract parts of the brain, and they are not predisposed to developing • Glaucoma Wilms’ tumor. • Corneal dystrophy A study of the PAX6 gene in Gillespie syndrome failed to • Nystagmus find a mutation, suggesting that abnormalities in the PAX6 gene • Aberrations of light have also been indicated as a cause of are not responsible for this syndrome. early poor vision in aniridia • Strabismus Pathophysiology • Ectopia lentis • Optic nerve hypoplasia. Primary developmental arrest of the neuroectoderm and a secondary alteration of all three neural crest waves of the Photophobia mesenchyme have been implicated in the pathogenesis of It is often present in affected patients and considered secondary aniridia. The exact defect in iris morphogenesis giving rise to to excessive light stimulation because of poor pupillary 2 JAYPEE JOCGP Congenital Aniridia constriction. A characteristic facial expression in many children consists of narrowing of the palpebral fissure and furrowing of the brow.1 Iris Abnormalities Aniridia is still considered by some to be one of the colobomatous disorders.10 The abnormalities can be: • Complete absence; as seen on oblique illumination • Hypoplasia with irregular pupillary margins (atypical coloboma of pupil) • Only root of the iris; visible on gonioscopy. Iris abnormalities from almost total absence to mild hypoplasia of the iris may occur in affected individuals. Since Fig. 2: Total aniridia with superiorly subluxated cataractous lens a small portion of iris tissue can almost always be found on (oblique illumination) gonioscopic examination, the term “irideremia” better describes the condition than does aniridia.8,9 In addition, ocular colobomas and aniridia have been reported among individuals in the same usually during the first two decades of life. Subtle changes may family in the patients with aniridia. It is now known that iris be present in the lens at birth, and these can progress to thinning with a round; normal-appearing pupil may be found in significant opacities by middle age. family members of aniridics who, on further examination, show Types
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