scholarly journals Retinitis Pigmentosa withEYSMutations Is the Most Prevalent Inherited Retinal Dystrophy in Japanese Populations

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Yuuki Arai ◽  
Akiko Maeda ◽  
Yasuhiko Hirami ◽  
Chie Ishigami ◽  
Shinji Kosugi ◽  
...  
Keyword(s):  
Retinitis Pigmentosa ◽  
Direct Sequencing ◽  
Retinal Dystrophy ◽  
In Silico Analysis ◽  
Japanese Patients ◽  
Sequence Variants ◽  
Stargardt Disease ◽  
Identification Rate ◽  
Inherited Retinal Dystrophies ◽  
Inherited Retinal Dystrophy

The aim of this study was to gain information about disease prevalence and to identify the responsible genes for inherited retinal dystrophies (IRD) in Japanese populations. Clinical and molecular evaluations were performed on 349 patients with IRD. For segregation analyses, 63 of their family members were employed. Bioinformatics data from 1,208 Japanese individuals were used as controls. Molecular diagnosis was obtained by direct sequencing in a stepwise fashion utilizing one or two panels of 15 and 27 genes for retinitis pigmentosa patients. If a specific clinical diagnosis was suspected, direct sequencing of disease-specific genes, that is,ABCA4for Stargardt disease, was conducted. Limited availability of intrafamily information and decreasing family size hampered identifying inherited patterns. Differential disease profiles with lower prevalence of Stargardt disease from European and North American populations were obtained. We found 205 sequence variants in 159 of 349 probands with an identification rate of 45.6%. This study found 43 novel sequence variants. In silico analysis suggests that 20 of 25 novel missense variants are pathogenic.EYSmutations had the highest prevalence at 23.5%. c.4957_4958insA and c.8868C>A were the two majorEYSmutations identified in this cohort.EYSmutations are the most prevalent among Japanese patients with IRD.

scholarly journals Genetic and Phenotypic Landscape of PRPH2-Associated Retinal Dystrophy in Japan

Genes ◽  
2021 ◽  
Vol 12 (11) ◽  
pp. 1817
Author(s):  
Akio Oishi ◽  
Kaoru Fujinami ◽  
Go Mawatari ◽  
Nobuhisa Naoi ◽  
Yasuhiro Ikeda ◽  
...  
Keyword(s):  
Retinitis Pigmentosa ◽  
Age Of Onset ◽  
Phenotypic Variability ◽  
Retinal Dystrophy ◽  
Japanese Patients ◽  
Macular Dystrophy ◽  
Hand Motion ◽  
Pathogenic Variants ◽  
Inherited Retinal Dystrophy ◽  
Asian Cohort

Peripherin-2 (PRPH2) is one of the causative genes of inherited retinal dystrophy. While the gene is relatively common in Caucasians, reports from Asian ethnicities are limited. In the present study, we report 40 Japanese patients from 30 families with PRPH2-associated retinal dystrophy. We identified 17 distinct pathogenic or likely pathogenic variants using next-generation sequencing. Variants p.R142W and p.V200E were relatively common in the cohort. The age of onset was generally in the 40’s; however, some patients had earlier onset (age: 5 years). Visual acuity of the patients ranged from hand motion to 1.5 (Snellen equivalent 20/13). The patients showed variable phenotypes such as retinitis pigmentosa, cone-rod dystrophy, and macular dystrophy. Additionally, intrafamilial phenotypic variability was observed. Choroidal neovascularization was observed in three eyes of two patients with retinitis pigmentosa. The results demonstrate the genotypic and phenotypic variations of the disease in the Asian cohort.

scholarly journals Innate and Autoimmunity in the Pathogenesis of Inherited Retinal Dystrophy

Cells ◽  
2020 ◽  
Vol 9 (3) ◽  
pp. 630 ◽  
Author(s):  
T. J. Hollingsworth ◽  
Alecia K. Gross
Keyword(s):  
Disease Progression ◽  
Age Of Onset ◽  
Retinal Dystrophy ◽  
Inherited Retinal Dystrophies ◽  
Retinal Dystrophies ◽  
Major Player ◽  
Inherited Retinal Dystrophy ◽  
Rate Of Progression ◽  
Immunohistochemical Methods ◽  
Onset Rate

Inherited retinal dystrophies (RDs) are heterogenous in many aspects including genes involved, age of onset, rate of progression, and treatments. While RDs are caused by a plethora of different mutations, all result in the same outcome of blindness. While treatments, both gene therapy-based and drug-based, have been developed to slow or halt disease progression and prevent further blindness, only a small handful of the forms of RDs have treatments available, which are primarily for recessively inherited forms. Using immunohistochemical methods coupled with electroretinography, optical coherence tomography, and fluorescein angiography, we show that in rhodopsin mutant mice, the involvement of both the innate and the autoimmune systems could be a strong contributing factor in disease progression and pathogenesis. Herein, we show that monocytic phagocytosis and inflammatory cytokine release along with protein citrullination, a major player in forms of autoimmunity, work to enhance the progression of RD associated with a rhodopsin mutation.

scholarly journals Targeting of the NRL Pathway as a Therapeutic Strategy to Treat Retinitis Pigmentosa

2020 ◽  
Vol 9 (7) ◽  
pp. 2224 ◽  
Author(s):  
Spencer M. Moore ◽  
Dorota Skowronska-Krawczyk ◽  
Daniel L. Chao
Keyword(s):  
Retinitis Pigmentosa ◽  
Autosomal Recessive ◽  
Therapeutic Strategy ◽  
Leucine Zipper ◽  
Retinal Dystrophy ◽  
Rod Photoreceptor ◽  
Cone Photoreceptor ◽  
Future Directions ◽  
Inherited Retinal Dystrophy ◽  
Visual Acuity Loss

Retinitis pigmentosa (RP) is an inherited retinal dystrophy (IRD) with a prevalence of 1:4000, characterized by initial rod photoreceptor loss and subsequent cone photoreceptor loss with accompanying nyctalopia, visual field deficits, and visual acuity loss. A diversity of causative mutations have been described with autosomal dominant, autosomal recessive, and X-linked inheritance and sporadic mutations. The diversity of mutations makes gene therapy challenging, highlighting the need for mutation-agnostic treatments. Neural leucine zipper (NRL) and NR2E3 are factors important for rod photoreceptor cell differentiation and homeostasis. Germline mutations in NRL or NR2E3 leads to a loss of rods and an increased number of cones with short wavelength opsin in both rodents and humans. Multiple groups have demonstrated that inhibition of NRL or NR2E3 activity in the mature retina could endow rods with certain properties of cones, which prevents cell death in multiple rodent RP models with diverse mutations. In this review, we summarize the literature on NRL and NR2E3, therapeutic strategies of NRL/NR2E3 modulation in preclinical RP models, as well as future directions of research. In summary, inhibition of the NRL/NR2E3 pathway represents an intriguing mutation agnostic and disease-modifying target for the treatment of RP.

scholarly journals Antioxidant and Biological Properties of Mesenchymal Cells Used for Therapy in Retinitis Pigmentosa

Antioxidants ◽  
2020 ◽  
Vol 9 (10) ◽  
pp. 983
Author(s):  
Paolo Giuseppe Limoli ◽  
Enzo Maria Vingolo ◽  
Celeste Limoli ◽  
Marcella Nebbioso
Keyword(s):  
Retinitis Pigmentosa ◽  
Tissue Repair ◽  
Therapeutic Option ◽  
Retinal Dystrophy ◽  
Retinal Disease ◽  
Biological Properties ◽  
Mesenchymal Cells ◽  
Cell Therapies ◽  
Tissue Repair And Regeneration ◽  
Inherited Retinal Dystrophy

Both tissue repair and regeneration are a priority in regenerative medicine. Retinitis pigmentosa (RP), a complex retinal disease characterized by the progressive loss of impaired photoreceptors, is currently lacking effective therapies: this represents one of the greatest challenges in the field of ophthalmological research. Although this inherited retinal dystrophy is still an incurable genetic disease, the oxidative damage is an important pathogenetic element that may represent a viable target of therapy. In this review, we summarize the current neuroscientific evidence regarding the effectiveness of cell therapies in RP, especially those based on mesenchymal cells, and we focus on their therapeutic action: limitation of both oxidative stress and apoptotic processes triggered by the disease and promotion of cell survival. Cell therapy could therefore represent a feasible therapeutic option in RP.

scholarly journals A missense variant in IFT122 associated with a canine model of retinitis pigmentosa

2021 ◽  
Author(s):  
Maria Kaukonen ◽  
Inka-Tuulevi Pettinen ◽  
Kaisa Wickström ◽  
Meharji Arumilli ◽  
Jonas Donner ◽  
...  
Keyword(s):  
Retinitis Pigmentosa ◽  
Genome Wide Association Study ◽  
Retinal Dystrophy ◽  
Intraflagellar Transport ◽  
Missense Variant ◽  
Canine Model ◽  
Progressive Retinal Atrophy ◽  
Inherited Retinal Dystrophies ◽  
A Genome ◽  
Causes Of Disease

AbstractRetinitis pigmentosa (RP) is a blinding eye disease affecting nearly two million people worldwide. Dogs are affected with a similar illness termed progressive retinal atrophy (PRA). Lapponian herders (LHs) are affected with several types of inherited retinal dystrophies, and variants in PRCD and BEST1 genes have been associated with generalized PRA and canine multifocal retinopathy 3 (cmr3), respectively. However, all retinal dystrophy cases in LHs are not explained by these variants, indicating additional genetic causes of disease in the breed. We collected DNA samples from 10 PRA affected LHs, with known PRCD and BEST1 variants excluded, and 34 unaffected LHs. A genome-wide association study identified a locus on CFA20 (praw = 2.4 × 10–7, pBonf = 0.035), and subsequent whole-genome sequencing of an affected LH revealed a missense variant, c.3176G>A, in the intraflagellar transport 122 (IFT122) gene. The variant was also found in Finnish Lapphunds, in which its clinical relevancy needs to be studied further. The variant interrupts a highly conserved residue, p.(R1059H), in IFT122 and likely impairs its function. Variants in IFT122 have not been associated with retinal degeneration in mammals, but the loss of ift122 in zebrafish larvae impaired opsin transport and resulted in progressive photoreceptor degeneration. Our study establishes a new spontaneous dog model to study the role of IFT122 in RP biology, while the affected breed will benefit from a genetic test for a recessive condition.

scholarly journals Allele-Specific Knockout by CRISPR/Cas to Treat Autosomal Dominant Retinitis Pigmentosa Caused by the G56R Mutation in NR2E3

2021 ◽  
Vol 22 (5) ◽  
pp. 2607
Author(s):  
Michalitsa Diakatou ◽  
Gregor Dubois ◽  
Nejla Erkilic ◽  
Carla Sanjurjo-Soriano ◽  
Isabelle Meunier ◽  
...  
Keyword(s):  
Retinitis Pigmentosa ◽  
Autosomal Dominant ◽  
Vision Loss ◽  
Retinal Dystrophy ◽  
Common Mutation ◽  
Wild Type ◽  
Inherited Retinal Dystrophy ◽  
Allele Specific ◽  
Induced Pluripotent ◽  
Overexpression System

Retinitis pigmentosa (RP) is an inherited retinal dystrophy that causes progressive vision loss. The G56R mutation in NR2E3 is the second most common mutation causing autosomal dominant (ad) RP, a transcription factor that is essential for photoreceptor development and maintenance. The G56R variant is exclusively responsible for all cases of NR2E3-associated adRP. Currently, there is no treatment for NR2E3-related or, other, adRP, but genome editing holds promise. A pertinent approach would be to specifically knockout the dominant mutant allele, so that the wild type allele can perform unhindered. In this study, we developed a CRISPR/Cas strategy to specifically knockout the mutant G56R allele of NR2E3 and performed a proof-of-concept study in induced pluripotent stem cells (iPSCs) of an adRP patient. We demonstrate allele-specific knockout of the mutant G56R allele in the absence of off-target events. Furthermore, we validated this knockout strategy in an exogenous overexpression system. Accordingly, the mutant G56R-CRISPR protein was truncated and mis-localized to the cytosol in contrast to the (peri)nuclear localizations of wild type or G56R NR2E3 proteins. Finally, we show, for the first time, that G56R iPSCs, as well as G56R-CRISPR iPSCs, can differentiate into NR2E3-expressing retinal organoids. Overall, we demonstrate that G56R allele-specific knockout by CRISPR/Cas could be a clinically relevant approach to treat NR2E3-associated adRP.

scholarly journals Mutation Screening in the miR-183/96/182 Cluster in Patients With Inherited Retinal Dystrophy

2020 ◽  
Vol 8 ◽  
Author(s):  
Shunbin Xu ◽  
Ardian Coku ◽  
Chithra K. Muraleedharan ◽  
Ali Harajli ◽  
Eric Mishulin ◽  
...  
Keyword(s):  
Mutation Screening ◽  
Retinal Dystrophy ◽  
Mature Mirnas ◽  
Sequence Variants ◽  
Mirna Cluster ◽  
Protein Coding ◽  
Negative Results ◽  
Inherited Retinal Dystrophy ◽  
Sensory Defects ◽  
Insight Into

Inherited retinal dystrophy (IRD) is a heterogenous blinding eye disease and affects more than 200,000 Americans and millions worldwide. By far, 270 protein-coding genes have been identified to cause IRD when defective. However, only one microRNA (miRNA), miR-204, has been reported to be responsible for IRD when a point-mutation occurs in its seed sequence. Previously, we identified that a conserved, polycistronic, paralogous miRNA cluster, the miR-183/96/182 cluster, is highly specifically expressed in all photoreceptors and other sensory organs; inactivation of this cluster in mice resulted in syndromic IRD with multi-sensory defects. We hypothesized that mutations in the miR-183/96/182 cluster in human cause IRD. To test this hypothesis, we perform mutation screening in the pre-miR-183, -96, -182 in >1000 peripheral blood DNA samples of patients with various forms of IRD. We identified six sequence variants, three in pre-miR-182 and three in pre-miR-96. These variants are in the pre-miRNA-182 or -96, but not in the mature miRNAs, and are unlikely to be the cause of the IRD in these patients. In spite of this, the nature and location of these sequence variants in the pre-miRNAs suggest that some may have impact on the biogenesis and maturation of miR-182 or miR-96 and potential roles in the susceptibility to diseases. Although reporting on negative results so far, our study established a system for mutation screening in the miR-183/96/182 cluster in human for a continued effort to unravel and provides deeper insight into the potential roles of miR-183/96/182 cluster in human diseases.

scholarly journals Pathogenicity Reclassification of RPE65 Missense Variants Related to Leber Congenital Amaurosis and Early-Onset Retinal Dystrophy

Genes ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 24 ◽  
Author(s):  
Fabiana Motta ◽  
Renan Martin ◽  
Fernanda Porto ◽  
Elizabeth Wohler ◽  
Rosane Resende ◽  
...  
Keyword(s):  
Molecular Diagnosis ◽  
Early Onset ◽  
Retinal Dystrophy ◽  
Low Frequency ◽  
Sequencing Data ◽  
Leber Congenital Amaurosis ◽  
Missense Variants ◽  
Inherited Retinal Dystrophies ◽  
Inherited Retinal Dystrophy ◽  
Uncertain Significance

A challenge in molecular diagnosis and genetic counseling is the interpretation of variants of uncertain significance. Proper pathogenicity classification of new variants is important for the conclusion of molecular diagnosis and the medical management of patient treatments. The purpose of this study was to reclassify two RPE65 missense variants, c.247T>C (p.Phe83Leu) and c.560G>A (p.Gly187Glu), found in Brazilian families. To achieve this aim, we reviewed the sequencing data of a 224-gene retinopathy panel from 556 patients (513 families) with inherited retinal dystrophies. Five patients with p.Phe83Leu and seven with p.Gly187Glu were selected and their families investigated. To comprehend the pathogenicity of these variants, we evaluated them based on the American College of Medical Genetics and Genomics and the Association for Molecular Pathology (ACMG/AMP) classification guidelines. Initially, these RPE65 variants met only three pathogenic criteria: (i) absence or low frequency in the population, (ii) several missense pathogenic RPE65 variants, and (iii) 15 out of 16 lines of computational evidence supporting them as damaging, which together allowed the variants to be classified as uncertain significance. Two other pieces of evidence were accepted after further analysis of these Brazilian families: (i) p.Phe83Leu and p.Gly187Glu segregate with childhood retinal dystrophy within families, and (ii) their prevalence in Leber congenital amaurosis (LCA)/early-onset retinal dystrophy (EORD) patients can be considered higher than in other inherited retinal dystrophy patients. Therefore, these variants can now be classified as likely pathogenic according to ACMG/AMP classification guidelines.

scholarly journals A missense Variant in IFT122 Associated with a Canine Model of Retinitis Pigmentosa

2021 ◽  
Author(s):  
Maria Kaukonen ◽  
Inka-Tuulevi Pettinen ◽  
Kaisa Wickström ◽  
Meharji Arumilli ◽  
Jonas Donner ◽  
...  
Keyword(s):  
Retinitis Pigmentosa ◽  
Genome Wide Association Study ◽  
Retinal Dystrophy ◽  
Intraflagellar Transport ◽  
Missense Variant ◽  
Canine Model ◽  
Progressive Retinal Atrophy ◽  
Inherited Retinal Dystrophies ◽  
A Genome ◽  
Causes Of Disease

Abstract Retinitis pigmentosa (RP) is a blinding eye disease affecting nearly two million people worldwide. Dogs are affected with a similar illness termed progressive retinal atrophy (PRA). Lapponian Herders (LHs) are affected with several types of inherited retinal dystrophies, and variants in PRCD and BEST1 genes have been associated with generalized PRA and canine multifocal retinopathy 3 (cmr3), respectively. However, all retinal dystrophy cases in LHs are not explained by these variants, indicating additional genetic causes of disease in the breed. We collected DNA samples from 10 PRA-affected LHs, with known PRCD and BEST1 variants excluded, and 34 unaffected LHs. A genome-wide association study identified a locus on CFA20 (praw=2.4x10-7, pBonf=0.035), and subsequent whole-genome sequencing of an affected LH revealed a missense variant, c.3176G>A, in the intraflagellar transport 122 (IFT122) gene. The variant was also found in Finnish Lapphunds, in which its clinical relevancy needs to be studied further. The variant interrupts a highly conserved residue, p.(R1059H), in IFT122 and likely impairs its function. Variants in IFT122 have not been associated with retinal degeneration in mammals, but the loss of ift122 in zebrafish larvae impaired opsin transport and resulted in progressive photoreceptor degeneration. Our study establishes a new spontaneous dog model to study the role of IFT122 in RP biology, while the affected breed will benefit from a genetic test for a recessive condition.

Ayurvedic management of Retinitis Pigmentosa (Doshandha) - A Case Study

2017 ◽  
Vol 2 (05) ◽  
Author(s):  
Anju D. ◽  
Pushpa Raj Poudel ◽  
Ajoy Viswam ◽  
Ashwini M. J.
Keyword(s):  
Retinitis Pigmentosa ◽  
Low Vision ◽  
Symptomatic Relief ◽  
Retinal Dystrophy ◽  
Treatment Protocol ◽  
Signs And Symptoms ◽  
Photoreceptor Cells ◽  
Rod Photoreceptor ◽  
Night Time ◽  
Initial Symptoms

Retinitis pigmentosa (RP) is an inherited, degenerative eye disease that causes severe vision impairment due to the progressive degeneration of rod photoreceptor cells in retina. This form of retinal dystrophy manifests initial symptoms independentof age; thus, RP diagnosis occurs anywhere from early infancy to late adulthood. This primary pigmentary retinal dystrophy is a hereditary disorder predominantly affecting the rods more than the cones. The main classical triads of retinitis pigmentosa are arteriolar attenuation, Retinal bone spicule pigmentation and Waxy disc pallor. The main treatment of retinitis pigmentosa is by using Low vision aids (LVA) and Genetic counseling. As such a complete cure for retinitis pigmentosa is not present. So a treatment protocol has to be adopted that helps in at least the symptomatic relief. In Ayurveda, the signs and symptoms of this can be compared with the Lakshanas of Doshandha which is one among the Dristigata Roga. It is considered as a diseased condition in which sunset will obliterate the Dristi Mandala and makes the person blind at night time. During morning hours the rising sunrays will disperse the accumulated Dosas from Dristi to clear vision. This disease resembles Kaphajatimira in its pathogenesis, but the night blindness is the special feature. Since the disease is purely Kaphaja, a treatment attempt is planned in Kaphara and Brimhana line. The present paper discusses a case of retinitis pigmentosa and it’s Ayurvedic Treatment.

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