| Author/Editor | Iosifidis, Christos; Liu, Jingshu; Gale, Theodora; Ellingford, Jamie M; Campbell, Christopher; Ingram, Stuart; Chandler, Kate; Parry, Neil R.A.; Black, Graeme C. M.; Sergouniotis, Panagiotis I. | |
| Title | Clinical and genetic findings in TRPM1-related congenital stationary night blindness | |
| Type | članek | |
| Publication year | 2022 | |
| Volume | str. str. | |
| ISSN | 1755-375X - Acta ophthalmologica. Supplement | |
| Language | eng | |
| Abstract | Purpose Congenital stationary night blindness (CSNB) is a heterogeneous group of Mendelian retinal disorders that present in childhood. Biallelic variants altering the protein-coding region of the TRPM1 gene are one of the commonest causes of CSNB. Here, we report the clinical and genetic findings in 10 unrelated individuals with TRPM1-retinopathy. Methods Study subjects were recruited through a tertiary clinical ophthalmic genetic service at Manchester, UK. All participants underwent visual electrodiagnostic testing and panel-based genetic analysis. Results Study subjects had a median age of 8 years (range: 3‐20 years). All probands were myopic and had electroretinographic findings in keeping with complete CSNB. Notably, three probands reported no night vision problems. Fourteen different disease-associated TRPM1 variants were detected. One individual was homozygous for the NM_001252024.2 (TRPM1):c.965 + 29G>A variant and a mini-gene assay highlighted that this change results in mis-splicing and premature protein termination. Additionally, two unrelated probands who had CSNB and mild neurodevelopmental abnormalities were found to carry a 15q13.3 microdeletion. This copy number variant encompasses seven genes, including TRPM1, and was encountered in the heterozygous state and in trans with a missense TRPM1 variant in each case. Conclusion Our findings highlight the importance of comprehensive genomic analysis, beyond the exons and protein-coding regions of genes, for individuals with CSNB. When this characteristic retinal phenotype is accompanied by extraocular findings (including learning and/or behavioural difficulties), a 15q13.3 microdeletion should be suspected. Focused analysis (e.g. microarray testing) is recommended to look for large-scale deletions encompassing TRPM1 in patients with CSNB and neurodevelopmental abnormalities. | |
| Keywords | congenital stationary night blindness electroretinography high-throughput sequencing prirojena stacionarna nočna slepota elektroretinografija visoko zmogljivo sekvenciranje |