Leber Congenital Amaurosis 15

Alternative Names

  • LCA15
  • Retinitis Pigmentosa, Juvenile, TULP1-Related

Associated Genes

Tubby-Like Protein 1
Back to search Result
WHO-ICD-10 version:2010

Diseases of the eye and adnexa

Disorders of choroid and retina

OMIM Number

613843

Mode of Inheritance

Autosomal recessive

Gene Map Locus

6p21.31

Description

Leber's congenital amaurosis (LCA) is a group of rare inherited retinal dystrophies, characterized by vision loss, often from birth. LCA is the most severe form of all inherited retinal dystrophies. It accounts for at least 5% of retinal dystrophies and is one of the main causes of blindness in children. The estimated birth prevalence of LCA is two to three per 100,000 births. There are at least 13 types of Leber congenital amaurosis. These types are distinguished by their genetic cause, patterns of vision loss, and related eye abnormalities.

Clinical diagnosis is based on clinical history of failure to develop reactions to visual stimuli, roving eye movements or nystagmus, sluggish pupillary responses and a normal, or less frequently an abnormal fundus on dilated fundoscopy. To date, no definitive treatment or cure for LCA exists.

Molecular Genetics

Leber's congenital amaurosis is generally inherited in an autosomal recessive pattern, although some autosomal dominant families have been reported. At least 20 different genes involved in LCA have been identified. All these genes are necessary for normal vision, and play a variety of roles in the development and function of the retina. Mutation in the TULP1 gene is a cause of LCA15, with about 14 mutations reported so far. The protein encoded by TULP1 gene is required for normal development and function of photoreceptor, and for long-term survival of photoreceptor cells.

Epidemiology in the Arab World

View Map
Subject IDCountrySexFamily HistoryParental ConsanguinityHPO TermsVariantZygosityMode of InheritanceReferenceRemarks
613843.1Saudi ArabiaUnknownNo Rod-cone dystrophyNM_003322.6:c.901C>THomozygousAutosomal, RecessivePatel et al. 2016 Early-onset retiniti...
613843.2.1Saudi ArabiaYesYes Visual impairment; Nystagmus; Attenuatio...NM_003322.6:c.901C>THomozygousAutosomal, RecessiveLi et al. 2009
613843.2.2Saudi ArabiaYesYes Macular atrophy; Bone spicule pigmentati...NM_003322.6:c.901C>THomozygousAutosomal, RecessiveLi et al. 2009 Relative of 613843.2...
613843.2.3Saudi ArabiaYesYes Nystagmus; Hypermetropia; Astigmatism; O...NM_003322.6:c.901C>THomozygousAutosomal, RecessiveLi et al. 2009 Relative of 613843.2...
613843.3.1Saudi ArabiaYesYes Rod-cone dystrophyNM_003322.6:c.901C>THomozygousAutosomal, RecessiveLi et al. 2009 Patient 11 from fami...
613843.3.2Saudi ArabiaYesYes Rod-cone dystrophy; Attenuation of retin...NM_003322.6:c.901C>THomozygousAutosomal, RecessiveLi et al. 2009 Relative of 613843.3...
613843.3.3Saudi ArabiaYesYes Nystagmus; Optic disc pallor; Abnormalit...NM_003322.6:c.901C>THomozygousAutosomal, RecessiveLi et al. 2009 Relative of 613843.3...
613843.3.4Saudi ArabiaYesYes Optic disc pallor; Attenuation of retina...NM_003322.6:c.901C>THomozygousAutosomal, RecessiveLi et al. 2009 Relative of 613843.3...
613843.3.5Saudi ArabiaYesYes Optic disc pallor; Attenuation of retina...NM_003322.6:c.901C>THomozygousAutosomal, RecessiveLi et al. 2009 Relative of 613843.3...
613843.3.6Saudi ArabiaYesYes Optic disc pallor; Attenuation of retina...NM_003322.6:c.901C>THomozygousAutosomal, RecessiveLi et al. 2009 Relative of 613843.3...
613843.3.7Saudi ArabiaYesYes Nystagmus; Visual impairment; Optic disc...NM_003322.6:c.901C>THomozygousAutosomal, RecessiveLi et al. 2009 Relative of 613843.3...
613843.3.8Saudi ArabiaYesYes Optic disc pallor; Attenuation of retina...NM_003322.6:c.901C>THomozygousAutosomal, RecessiveLi et al. 2009 Relative of 613843.3...
613843.3.9Saudi ArabiaYesYes Nystagmus; Visual impairment; Undetectab...NM_003322.6:c.901C>THomozygousAutosomal, RecessiveLi et al. 2009 Relative of 613843.3...
613843.4.1Saudi ArabiaFemaleYesYes Undetectable electroretinogram; Attenuat...NM_003322.6:c.901C>THomozygousAutosomal, RecessiveLi et al. 2009 Patient 8 from famil...
613843.4.2Saudi ArabiaFemaleYesYes Undetectable electroretinogram; Attenuat...NM_003322.6:c.901C>THomozygousAutosomal, RecessiveLi et al. 2009 Sister of 613843.4.1...
613843.5.1Saudi ArabiaYesYes High hypermetropia; Fundus albipunctatusNM_003322.6:c.901C>THomozygousAutosomal, RecessiveLi et al. 2009 Patient 7 from famil...
613843.5.2Saudi ArabiaYesYes Rotary nystagmus; Optic disc pallor; Att...NM_003322.6:c.901C>THomozygousAutosomal, RecessiveLi et al. 2009 Relative of 613843.5...
613843.5.3Saudi ArabiaYesYes Rotary nystagmus; Optic disc pallor; Att...NM_003322.6:c.901C>THomozygousAutosomal, RecessiveLi et al. 2009 Relative of 613843.5...
613843.5.4Saudi ArabiaYesYes Rotary nystagmus; Optic disc pallor; Att...NM_003322.6:c.901C>THomozygousAutosomal, RecessiveLi et al. 2009 Relative of 613843.5...
613843.5.5Saudi ArabiaYesYes Rotary nystagmus; Attenuation of retinal...NM_003322.6:c.901C>THomozygousAutosomal, RecessiveLi et al. 2009 Relative of 613843.5...
613843.5.6Saudi ArabiaYesYes Hypermetropia; Nystagmus; Abnormality of...NM_003322.6:c.901C>THomozygousAutosomal, RecessiveLi et al. 2009 Relative of 613843.5...
613843.5.7Saudi ArabiaYesYes Rotary nystagmus; Attenuation of retinal...NM_003322.6:c.901C>THomozygousAutosomal, RecessiveLi et al. 2009 Relative of 613843.5...
613843.5.8Saudi ArabiaYesYes Rotary nystagmus; Attenuation of retinal...NM_003322.6:c.901C>THomozygousAutosomal, RecessiveLi et al. 2009 Relative of 613843.5...
613843.5.9Saudi ArabiaYesYes Rotary nystagmus; Attenuation of retinal...NM_003322.6:c.901C>THomozygousAutosomal, RecessiveLi et al. 2009 Relative of 613843.5...
613843.5.10Saudi ArabiaYesYes Rotary nystagmus; Hypermetropia; Rod-con...NM_003322.6:c.901C>THomozygousAutosomal, RecessiveLi et al. 2009 Relative of 613843.5...
613843.5.11Saudi ArabiaYesYes Rotary nystagmus; Hypermetropia; Attenua...NM_003322.6:c.901C>THomozygousAutosomal, RecessiveLi et al. 2009 Relative of 613843.5...
613843.5.12Saudi ArabiaYesYes Rotary nystagmus; Attenuation of retinal...NM_003322.6:c.901C>THomozygousAutosomal, RecessiveLi et al. 2009 Relative of 613843.5...
613843.5.13Saudi ArabiaYesYes Rotary nystagmus; Attenuation of retinal...NM_003322.6:c.901C>THomozygousAutosomal, RecessiveLi et al. 2009 Relative of 613843.5...
613843.6.1Saudi ArabiaYesYes Rotary nystagmus; Attenuation of retinal...NM_003322.6:c.901C>THomozygousAutosomal, RecessiveLi et al. 2009 Patient 4 from famil...
613843.6.2Saudi ArabiaYesYes Rotary nystagmusNM_003322.6:c.901C>THomozygousAutosomal, RecessiveLi et al. 2009 Relative of 613843.6...
613843.G.1Saudi ArabiaUnknownYesYes Visual impairment; Rod-cone dystrophyNM_003322.6:c.901C>THomozygousAutosomal, RecessivePatel et al, 2018 3 members of a famil...
613843.G.2Saudi ArabiaUnknownYesYes Visual impairment; Rod-cone dystrophyNM_003322.6:c.901C>THomozygousAutosomal, RecessivePatel et al, 2018 13 members of a fami...
613843.G.3Saudi ArabiaUnknownYesYes Visual impairment; Congenital stationar...NM_003322.6:c.901C>THomozygousAutosomal, RecessivePatel et al, 2018 2 members of a famil...
613843.G.4Saudi ArabiaUnknownYes Retinal dystrophyNM_003322.6:c.180delHomozygousAutosomal, RecessivePatel et al. 2016 Family with unknown ...
613843.G.5Saudi ArabiaUnknownNo Rod-cone dystrophyNM_003322.6:c.901C>THomozygousAutosomal, RecessivePatel et al. 2016 Family with unknown ...
613843.G.6Saudi ArabiaUnknownNo Retinal dystrophyNM_003322.6:c.901C>THomozygousAutosomal, RecessivePatel et al. 2016 Family with unknown ...
613843.G.7Saudi ArabiaUnknownYes Rod-cone dystrophyNM_003322.6:c.901C>THomozygousAutosomal, RecessivePatel et al. 2016 Family with unknown ...
613843.G.8Saudi ArabiaUnknownYes Rod-cone dystrophyNM_003322.6:c.901C>THomozygousAutosomal, RecessivePatel et al. 2016 Family with unknown ...

Other Reports

Algeria

Mataftsi et al. (2007) reported a large consanguineous Algerian family in which seven individuals from three sibships were affected with Leber congenital amaurosis or early-onset retinal degeneration. Symptoms started at birth in two patients and during infancy in five patients, with age at diagnosis ranging from 3 years to 12 years of age. All patients had night blindness and nystagmus, but none had photophobia. Six patients had myopia, and one had mild hyperopia; visual acuity ranged from perception of light to 20/100. Visual fields were moderately to severely restricted in patients who were tested, and color vision was severely disturbed without a specific axis of confusion. The pupillary reflex was extremely sluggish in most of the patients. None presented signs of keratoconus. Funduscopic findings varied significantly across and within the sibships, primarily in an age-dependent manner: the youngest patient had no detectable maculopathy, three patients of intermediate age had an indistinct foveolar reflex, and the three oldest affected individuals had pronounced maculopathy. In addition, the optic disc appeared healthy in the younger patients, whereas moderate to waxy disc pallor was evident in the three oldest; the latter patients also displayed an annulus of peripapillary retinal pigment epithelium (RPE) atrophy in both eyes. Pigment retinopathy and retinal vessel attenuation were present in all but the youngest subject, with some patients having severely sclerosed arteries and multiple occluded or ghost vessels in the periphery. Fluorescein angiography confirmed the presence of peripapillary RPE atrophy and absence of macular edema. The proband was examined on two occasions eight months apart, and during that interval his visual acuity declined from 20/100 to 20/250 in the better eye. Full-field ERGs in the proband showed completely extinguished rod- and cone-driven responses, and macular optical coherence tomography scans showed an abnormal lamination due to the underlying degenerative disease. The nerve fiber layer and inner plexiform layer seemed to be preserved, but the structures of the outer retina were non-detectable, and retinal thickness was significantly reduced.

© CAGS 2024. All rights reserved.