Novel homozygous CLN3 missense variant in isolated retinal dystrophy: A case report and electron microscopic findings
Abstract Background Biallelic CLN3 gene variants have been found in either juvenile‐onset neuronal ceroid lipofuscinosis (JNCL) or isolated retinal dystrophy. It has been reported that most JNCL patients carry a common 1.02‐kb deletion variant homozygously. Clinical characteristics of patients with...
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doaj-f2df278fa9aa48e9b8f93ef3e7ce7b262020-11-25T03:56:35ZengWileyMolecular Genetics & Genomic Medicine2324-92692020-08-0188n/an/a10.1002/mgg3.1308Novel homozygous CLN3 missense variant in isolated retinal dystrophy: A case report and electron microscopic findingsKei Mizobuchi0Takaaki Hayashi1Kazutoshi Yoshitake2Kaoru Fujinami3Toshiaki Tachibana4Kazushige Tsunoda5Takeshi Iwata6Tadashi Nakano7Department of Ophthalmology The Jikei University School of Medicine Tokyo JapanDepartment of Ophthalmology The Jikei University School of Medicine Tokyo JapanDivision of Molecular and Cellular Biology, National Institute of Sensory Organs National Hospital Organization Tokyo Medical Center Tokyo JapanDivision of Vision Research, National Institute of Sensory Organs National Hospital Organization Tokyo Medical Center Tokyo JapanCore Research Facilities for Basic Science, Research Center for Medical Science The Jikei University School of Medicine Tokyo JapanDivision of Vision Research, National Institute of Sensory Organs National Hospital Organization Tokyo Medical Center Tokyo JapanDivision of Molecular and Cellular Biology, National Institute of Sensory Organs National Hospital Organization Tokyo Medical Center Tokyo JapanDepartment of Ophthalmology The Jikei University School of Medicine Tokyo JapanAbstract Background Biallelic CLN3 gene variants have been found in either juvenile‐onset neuronal ceroid lipofuscinosis (JNCL) or isolated retinal dystrophy. It has been reported that most JNCL patients carry a common 1.02‐kb deletion variant homozygously. Clinical characteristics of patients with biallelic CLN3 missense variants are not well elucidated. Methods We described a 26‐year‐old Japanese male patient with isolated retinal dystrophy. Whole‐exome sequencing (WES) and transmission electron microscopy (TEM) were performed. Results Whole‐exome sequencing identified a novel homozygous CLN3 missense variant [c.482C>T; p.(Ser161Leu)]. Ophthalmoscopy revealed retinal degeneration and macular atrophy, and later attenuated retinal vessels. Severely reduced responses were observed in both rod and cone electroretinograms. In TEM of the patient's lymphocytes, fingerprint profiles, which are specific findings in CLN3‐associated JNCL, were observed in 16/624 (2.56%) lymphocytes of the patient, who has never exhibited neurological signs during the 13‐year follow‐up period. Conclusion Our results indicated that this novel CLN3 missense variant is associated with teenage‐onset isolated retinal dystrophy. This is the first report of any patient with CLN3‐associated disorder in the Japanese population. Although fingerprint profiles have never been reported in CLN3‐associated isolated retinal dystrophy, these profiles were observed, albeit infrequently, suggesting that frequency of the fingerprint profiles might depend on variant types.https://doi.org/10.1002/mgg3.1308electroretinographylysosomal storage diseaseretinatransmission electron microscopywhole‐exome and genome sequencing |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Kei Mizobuchi Takaaki Hayashi Kazutoshi Yoshitake Kaoru Fujinami Toshiaki Tachibana Kazushige Tsunoda Takeshi Iwata Tadashi Nakano |
spellingShingle |
Kei Mizobuchi Takaaki Hayashi Kazutoshi Yoshitake Kaoru Fujinami Toshiaki Tachibana Kazushige Tsunoda Takeshi Iwata Tadashi Nakano Novel homozygous CLN3 missense variant in isolated retinal dystrophy: A case report and electron microscopic findings Molecular Genetics & Genomic Medicine electroretinography lysosomal storage disease retina transmission electron microscopy whole‐exome and genome sequencing |
author_facet |
Kei Mizobuchi Takaaki Hayashi Kazutoshi Yoshitake Kaoru Fujinami Toshiaki Tachibana Kazushige Tsunoda Takeshi Iwata Tadashi Nakano |
author_sort |
Kei Mizobuchi |
title |
Novel homozygous CLN3 missense variant in isolated retinal dystrophy: A case report and electron microscopic findings |
title_short |
Novel homozygous CLN3 missense variant in isolated retinal dystrophy: A case report and electron microscopic findings |
title_full |
Novel homozygous CLN3 missense variant in isolated retinal dystrophy: A case report and electron microscopic findings |
title_fullStr |
Novel homozygous CLN3 missense variant in isolated retinal dystrophy: A case report and electron microscopic findings |
title_full_unstemmed |
Novel homozygous CLN3 missense variant in isolated retinal dystrophy: A case report and electron microscopic findings |
title_sort |
novel homozygous cln3 missense variant in isolated retinal dystrophy: a case report and electron microscopic findings |
publisher |
Wiley |
series |
Molecular Genetics & Genomic Medicine |
issn |
2324-9269 |
publishDate |
2020-08-01 |
description |
Abstract Background Biallelic CLN3 gene variants have been found in either juvenile‐onset neuronal ceroid lipofuscinosis (JNCL) or isolated retinal dystrophy. It has been reported that most JNCL patients carry a common 1.02‐kb deletion variant homozygously. Clinical characteristics of patients with biallelic CLN3 missense variants are not well elucidated. Methods We described a 26‐year‐old Japanese male patient with isolated retinal dystrophy. Whole‐exome sequencing (WES) and transmission electron microscopy (TEM) were performed. Results Whole‐exome sequencing identified a novel homozygous CLN3 missense variant [c.482C>T; p.(Ser161Leu)]. Ophthalmoscopy revealed retinal degeneration and macular atrophy, and later attenuated retinal vessels. Severely reduced responses were observed in both rod and cone electroretinograms. In TEM of the patient's lymphocytes, fingerprint profiles, which are specific findings in CLN3‐associated JNCL, were observed in 16/624 (2.56%) lymphocytes of the patient, who has never exhibited neurological signs during the 13‐year follow‐up period. Conclusion Our results indicated that this novel CLN3 missense variant is associated with teenage‐onset isolated retinal dystrophy. This is the first report of any patient with CLN3‐associated disorder in the Japanese population. Although fingerprint profiles have never been reported in CLN3‐associated isolated retinal dystrophy, these profiles were observed, albeit infrequently, suggesting that frequency of the fingerprint profiles might depend on variant types. |
topic |
electroretinography lysosomal storage disease retina transmission electron microscopy whole‐exome and genome sequencing |
url |
https://doi.org/10.1002/mgg3.1308 |
work_keys_str_mv |
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