| 1. |
- Abdelkader, Ehab, et al.
(författare)
-
Novel causative variants in patients with achromatopsia
- 2018
-
Ingår i: Ophthalmic Genetics. - : Informa UK Limited. - 1381-6810 .- 1744-5094. ; 39:6, s. 678-683
-
Tidskriftsartikel (refereegranskat)abstract
- Purpose: To report five novel genetic variants in seven unrelated consanguineous families with achromatopsia (ACHM). Methods: Patients were examined with multimodal retinal imaging and full-field electroretinography (ffERG). Genetic testing was conducted using next-generation sequencing (NGS). Results: Three novel homozygous variants were detected in CNGA3: a missense c.967G > C (p.Ala323Pro) variant was detected in exon 8 (one patient), a splice site variant c.101 + 1G > A in intron 2 (three patients), and a splice site variant c.395 + 1G > T in intron 4(one patient). Another two novel variants were found in PDE6C: a homozygous missense variant c.1899C > A (p.His633Gln) in exon 15 (one patient) and a homozygous splice site variant c.1072-1G > C in intron 7 (one patient). Mutation segregation assessment was possible in 3 of the 7 families. All patients had nonrecordable ffERG 30-Hz flicker responses, reduced single-flash cone responses but preserved rod responses. Patients presented with variable degrees of foveal outer retinal layer loss and variable patterns of foveal hyperautofluorescence. Conclusions: These novel variants expand the genotypes associated with ACHM and may help in future therapy development for ACHM.
|
|
| 2. |
|
|
| 3. |
- Celojevic, Dragana, 1985, et al.
(författare)
-
EPHA2 polymorphisms in Estonian patients with age-related cataract.
- 2016
-
Ingår i: Ophthalmic genetics. - : Informa UK Limited. - 1744-5094 .- 1381-6810. ; 37:1, s. 14-18
-
Tidskriftsartikel (refereegranskat)abstract
- Abstract Background: Ephrin receptors (Ephs) are tyrosine kinases that together with their ligands, ephrins, are considered important in cell-cell communication, especially during embryogenesis but also for epithelium homeostasis. Studies have demonstrated the involvement of mutations or common variants of the gene encoding Eph receptor A2 (EPHA2), in congenital cataract and in age-related cataract. This study investigated a number of disease-associated single nucleotide polymorphisms (SNPs) in EPHA2 in patients with age-related cataract. Materials and methods: The study included 491 Estonian patients who had surgery for age-related cataract, classified as nuclear, cortical, posterior subcapsular and mixed lens opacities, and 185 controls of the same ethnical origin. Seven SNPs in EPHA2 (rs7543472, rs11260867, rs7548209, rs3768293, rs6603867, rs6678616, rs477558) were genotyped using TaqMan Allelic Discrimination. Statistical analyses for single factor associations used χ(2)-test and logistic regression was performed including relevant covariates (age, sex and smoking). Results: In single-SNP allele analysis, only the rs7543472 showed a borderline significant association with risk of cataract (p=0.048). Regression analysis with known risk factors for cataract showed no significant associations of the studied SNPs with cataract. Stratification by cataract subtype did not alter the results. Adjusted odds ratios were between 0.82 and 1.16 (95% confidence interval 0.61-1.60). Conclusions: The present study does not support a major role of EphA2 in cataractogenesis in an Estonian population.
|
|
| 4. |
- Liu, Yangfan P., et al.
(författare)
-
Putative digenic inheritance of heterozygous RP1L1 and C2orf71 null mutations in syndromic retinal dystrophy
- 2017
-
Ingår i: Ophthalmic Genetics. - Philadelphia, USA : Taylor & Francis. - 1381-6810 .- 1744-5094. ; 38:2, s. 127-132
-
Tidskriftsartikel (refereegranskat)abstract
- Background: Retinitis pigmentosa (RP) is the most common cause of inherited retinal degeneration and can occur in non-syndromic and syndromic forms. Syndromic RP is accompanied by other symptoms such as intellectual disability, hearing loss, or congenital abnormalities. Both forms are known to exhibit complex genetic interactions that can modulate the penetrance and expressivity of the phenotype.Materials and methods: In an individual with atypical RP, hearing loss, ataxia and cerebellar atrophy, whole exome sequencing was performed. The candidate pathogenic variants were tested by developing an in vivo zebrafish model and assaying for retinal and cerebellar integrity.Results: Exome sequencing revealed a complex heterozygous protein-truncating mutation in RP1L1, p.[(Lys111Glnfs*27; Gln2373*)], and a heterozygous nonsense mutation in C2orf71, p.(Ser512*). Mutations in both genes have previously been implicated in autosomal recessive non-syndromic RP, raising the possibility of a digenic model in this family. Functional testing in a zebrafish model for two key phenotypes of the affected person showed that the combinatorial suppression of rp1l1 and c2orf71l induced discrete pathology in terms of reduction of eye size with concomitant loss of rhodopsin in the photoreceptors, and disorganization of the cerebellum.Conclusions: We propose that the combination of heterozygous loss-of-function mutations in these genes drives syndromic retinal dystrophy, likely through the genetic interaction of at least two loci. Haploinsufficiency at each of these loci is insufficient to induce overt pathology.
|
|
| 5. |
|
|
| 6. |
- Meinert, Monika, et al.
(författare)
-
Danon disease presenting with early onset of hypertrophic cardiomyopathy and peripheral pigmentary retinal dystrophy in a female with a de novo novel mosaic mutation in the LAMP2 gene
- 2019
-
Ingår i: Ophthalmic Genetics. - : Informa UK Limited. - 1381-6810 .- 1744-5094. ; 40:3, s. 227-236
-
Tidskriftsartikel (refereegranskat)abstract
- Purpose: To describe the phenotype and genotype in a young woman with Danon disease. Methods: The patient underwent an ophthalmic examination including best corrected visual acuity (BCVA), fundus photography and fundus autofluorescence (FAF), full-field electroretinography (full-field ERG), multifocal ERG, optical coherence tomography (OCT) and SAP-Humphrey 30-2 at the ages of 20 and 25. Electrooculography, fluorescein angiography (FA), indocyanine angiography and OCT angiography were performed only once. Genetic testing using a Next-Generation Sequencing panel and immunohistochemical analysis of LAMP2 protein expression were performed in the patient's explanted heart, and the patient's cardiologic and ophthalmologic records were retrospectively reviewed. Results: A de novo, novel, mosaic mutation, c.135dupA; p.(Trp46Metfs*10) was identified in exon 2 of the LAMP2 gene. Immunohistochemical investigation of the myocardium in the explanted heart revealed pronounced deficiency of LAMP2 protein in cardiomyocytes. The color photographs, FAF images and FA revealed more extensive peripheral pigmentary retinal dystrophy (PPRD) at the 5-year follow-up examination. No changes were observed in BCVA, OCT, SAP-Humphrey 30-2 or multifocal ERG findings at follow-up. Full-field ERG showed an asymmetric interocular reduction in ERG response at follow-up: the b-wave amplitude of the rod response had decreased by 29% in the right eye, but by only 6 % in the left eye. The a-wave amplitude of single-flash response had decreased by 9 % in the left eye, while it had increased by 3% in the right eye. Conclusions: Although PPRD progressed slowly, it was an important clue in the diagnosis of the life-threatening condition of Danon disease.
|
|
| 7. |
- Peter, Virginie G., et al.
(författare)
-
A novel missense variant in IDH3A causes autosomal recessive retinitis pigmentosa
- 2019
-
Ingår i: Ophthalmic Genetics. - : Informa UK Limited. - 1381-6810 .- 1744-5094. ; 40:2, s. 177-181
-
Tidskriftsartikel (refereegranskat)abstract
- Background: Inherited retinal degenerations (IRDs) encompass a wide spectrum of genetic ocular diseases characterized by considerable genetic and clinical heterogeneity. Methods: Complete ophthalmic examination and next-generation sequencing. Results: We describe a patient with no family history of vision loss, who at the age of 28 years developed visual impairment consistent with a severe form of retinitis pigmentosa. Genetic testing by means of whole exome sequencing identified a homozygous variant in the gene IDH3A. To date, only three papers have reported mutations in IDH3A, in families with early-onset retinal degeneration with or without the presence of macular pseudocoloboma. Conclusion: This study highlights the importance of including this rarely-mutated gene in the molecular diagnostic set-ups for IRDs, and further delineates the phenotypic spectrum elicited by mutations in IDH3A.
|
|
| 8. |
- Schatz, Patrik, et al.
(författare)
-
Multimodal imaging in CABP4-related retinopathy
- 2017
-
Ingår i: Ophthalmic Genetics. - : Informa UK Limited. - 1381-6810 .- 1744-5094. ; 38:5, s. 459-464
-
Tidskriftsartikel (refereegranskat)abstract
- Purpose: Multimodal imaging has not been documented for CABP4-related retinopathy. In this study, we describe optical coherence tomography (OCT) and fundus autofluorescence findings for five genetically confirmed cases. Methods: Retrospective case series. Results: Four patients with the previously described homozygous Saudi CABP4 founder mutation c.81_82insA (p.Pro28ThrfsX44) and one patient with the homozygous mutation c.1A>G (p.Met1?) in CABP4 were examined. The ages ranged between 9 and 16 years at last follow-up, and the duration of follow-up ranged from 2 to 12 years. Foveal thickness was reduced ranging between 175 and 212 micrometers. Wide field imaging including fundus autofluorescence was unremarkable. All patients presented with a negative electroretinogram, with a variable amount of cone and rod dysfunction. Over follow-up, there was no electroretinographic indication of any progressive retinal dysfunction. Conclusions: Foveal thinning is a feature of CABP4 retinopathy. Normal autofluorescence is consistent with inner retinal dysfunction and suggests the condition could be amenable to gene therapy. Retinal dysfunction was stable throughout follow-up.
|
|
| 9. |
|
|
| 10. |
|
|
