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Sabry S, Eissa NR, Zaki MS. Abnormal expression of lysosomal glycoproteins in patients with congenital disorders of glycosylation. BMC Res Notes 2023; 16:53. [PMID: 37069668 PMCID: PMC10108535 DOI: 10.1186/s13104-023-06314-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2022] [Accepted: 03/21/2023] [Indexed: 04/19/2023] Open
Abstract
OBJECTIVE The study of the impact of some inherited defects in glycosylation on the biosynthesis of some lysosomal glycoproteins. Results description: Whole-exome sequencing revealed a homozygous variant; 428G > A; p. (R143K) in SRD5A3 in one patient and a heterozygous one c.46G > A p. (Gly16Arg) in SLC35A2 in the other patient. Both variants were predicted to be likely pathogenic. Lysosome-associated membrane glycoprotein 2 (LAMP2) immunodetection in both cases showed a truncated form of the protein. Cystinosin (CTN) protein appeared as normal and truncated forms in both patients in ratios of the mature to truncated forms of CTN were lower than the control. The levels of the truncated forms of both cellular proteins were higher in the SRD5A3-CDG case compared to the SLC35A2-CDG case. The tetrameric form of cathepsin C (CTSC) was expressed at low levels in both cases with congenital disorder of glycosylation (CDG). SLC35A2-CDG patient had one extra-unknown band while SRD5A3-CDG patient had a missing band of CTSC forms. The expression patterns of lysosomal glycoproteins could be different between different types of CDG.
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Affiliation(s)
- Sahar Sabry
- Biochemical Genetics Department, Human Genetics and Genome Research Institute, National Research Centre (NRC), Cairo, Egypt.
| | - Noura R Eissa
- Medical Molecular Genetics Department, Human Genetics and Genome Research Institute, National Research Centre (NRC), Cairo, Egypt
| | - Maha S Zaki
- Clinical Genetics Department, Human Genetics and Genome Research Institute, National Research Centre (NRC), Cairo, Egypt
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Rieger M, Türk M, Kraus C, Uebe S, Ekici AB, Krumbiegel M, Huchzermeyer C, Reis A, Thiel C. SRD5A3-CDG: Twins with an intragenic tandem duplication. Eur J Med Genet 2022; 65:104492. [PMID: 35339718 DOI: 10.1016/j.ejmg.2022.104492] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Revised: 03/15/2022] [Accepted: 03/20/2022] [Indexed: 11/03/2022]
Abstract
Steroid 5α-reductase type 3 congenital disorder of glycosylation (SRD5A3-CDG) is a rare metabolic disease mainly characterized by psychomotor disability, visual impairment, and variable eye malformations caused by bi-allelic pathogenic variants in SRD5A3. So far, only 23 distinct mutations were described. Exome sequencing in 32-year old monozygotic male twins revealed only the heterozygous splice variant c.562+3delG in SRD5A3, but no second variant. The twins presented with psychomotor deficit and a complex eye disease including retinal dystrophy, pallor of the papilla, nystagmus, and strabismus suggestive of SRD5A3-CDG. Only when applying exome-based copy number analysis, we identified as a second compound heterozygous variant a previously not reported tandem duplication of exons 2-4 in SRD5A3. Next to the typical skeletal anomalies of SRD5A3-CDG such as kyphosis and scoliosis, extension deficits of the proximal interphalangeal (PIP) joints IV were observed. Since similar contractures were described once in a patient with SRD5A3-CDG, we suggest that this rare symptom is possibly associated with SRD5A3-CDG. Our findings further expand the mutational and clinical spectrum of SRD5A3-CDG and emphasize the importance of an intragenic copy number analysis in patients with strong clinical suspicion of SRD5A3-CDG and only one detectable sequence variant.
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Affiliation(s)
- Melissa Rieger
- Institute of Human Genetics, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91054, Erlangen, Germany
| | - Matthias Türk
- Department of Neurology, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91054, Erlangen, Germany
| | - Cornelia Kraus
- Institute of Human Genetics, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91054, Erlangen, Germany
| | - Steffen Uebe
- Institute of Human Genetics, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91054, Erlangen, Germany
| | - Arif B Ekici
- Institute of Human Genetics, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91054, Erlangen, Germany
| | - Mandy Krumbiegel
- Institute of Human Genetics, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91054, Erlangen, Germany
| | - Cord Huchzermeyer
- Department of Ophthalmology, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91054, Erlangen, Germany
| | - André Reis
- Institute of Human Genetics, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91054, Erlangen, Germany
| | - Christian Thiel
- Institute of Human Genetics, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91054, Erlangen, Germany.
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Tachibana N, Hosono K, Nomura S, Arai S, Torii K, Kurata K, Sato M, Shimakawa S, Azuma N, Ogata T, Wada Y, Okamoto N, Saitsu H, Nishina S, Hotta Y. Maternal Uniparental Isodisomy of Chromosome 4 and 8 in Patients with Retinal Dystrophy: SRD5A3-Congenital Disorders of Glycosylation and RP1-Related Retinitis Pigmentosa. Genes (Basel) 2022; 13:genes13020359. [PMID: 35205402 PMCID: PMC8872353 DOI: 10.3390/genes13020359] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Revised: 02/08/2022] [Accepted: 02/10/2022] [Indexed: 01/27/2023] Open
Abstract
Purpose: Uniparental disomy (UPD) is a rare chromosomal abnormality. We performed whole-exosome sequencing (WES) in cases of early-onset retinal dystrophy and identified two cases likely caused by UPD. Herein, we report these two cases and attempt to clarify the clinical picture of retinal dystrophies caused by UPD. Methods: WES analysis was performed for two patients and their parents, who were not consanguineous. Functional analysis was performed in cases suspected of congenital disorders of glycosylation (CDG). We obtained clinical case data and reviewed the literature. Results: In case 1, a novel c.57G>C, p.(Trp19Cys) variant in SRD5A3 was detected homozygously. Genetic analysis suggested a maternal UPD on chromosome 4, and functional analysis confirmed CDG. Clinical findings showed early-onset retinal dystrophy, intellectual disability, and epilepsy. In case 2, an Alu insertion (c.4052_4053ins328, p.[Tyr1352Alafs]) in RP1 was detected homozygously. Maternal UPD on chromosome 8 was suspected. The clinical picture was consistent with RP1-related retinitis pigmentosa. Although the clinical features of retinal dystrophy by UPD may vary, most cases present with childhood onset. Conclusions: There have been limited reports of retinal dystrophy caused by UPD, suggesting that it is rare. Genetic counseling may be encouraged in pediatric cases of retinal dystrophy.
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Affiliation(s)
- Nobutaka Tachibana
- Department of Ophthalmology, Hamamatsu University School of Medicine, Hamamatsu 431-3192, Japan; (N.T.); (K.H.); (S.N.); (S.A.); (K.T.); (K.K.); (M.S.)
| | - Katsuhiro Hosono
- Department of Ophthalmology, Hamamatsu University School of Medicine, Hamamatsu 431-3192, Japan; (N.T.); (K.H.); (S.N.); (S.A.); (K.T.); (K.K.); (M.S.)
| | - Shuhei Nomura
- Department of Ophthalmology, Hamamatsu University School of Medicine, Hamamatsu 431-3192, Japan; (N.T.); (K.H.); (S.N.); (S.A.); (K.T.); (K.K.); (M.S.)
| | - Shinji Arai
- Department of Ophthalmology, Hamamatsu University School of Medicine, Hamamatsu 431-3192, Japan; (N.T.); (K.H.); (S.N.); (S.A.); (K.T.); (K.K.); (M.S.)
| | - Kaoruko Torii
- Department of Ophthalmology, Hamamatsu University School of Medicine, Hamamatsu 431-3192, Japan; (N.T.); (K.H.); (S.N.); (S.A.); (K.T.); (K.K.); (M.S.)
| | - Kentaro Kurata
- Department of Ophthalmology, Hamamatsu University School of Medicine, Hamamatsu 431-3192, Japan; (N.T.); (K.H.); (S.N.); (S.A.); (K.T.); (K.K.); (M.S.)
| | - Miho Sato
- Department of Ophthalmology, Hamamatsu University School of Medicine, Hamamatsu 431-3192, Japan; (N.T.); (K.H.); (S.N.); (S.A.); (K.T.); (K.K.); (M.S.)
| | - Shuichi Shimakawa
- Department of Pediatrics, Osaka Medical and Pharmaceutical University Hospital, Takatsuki 569-8686, Japan;
| | - Noriyuki Azuma
- National Center for Child Health and Development, Department of Ophthalmology and Laboratory for Visual Science, Tokyo 157-8535, Japan; (N.A.); (S.N.)
| | - Tsutomu Ogata
- Department of Biochemistry, Hamamatsu University School of Medicine, Hamamatsu 431-3192, Japan; (T.O.); (H.S.)
- Hamamatsu Medical Center, Department of Pediatrics, Hamamatsu 432-8580, Japan
| | - Yoshinao Wada
- Department of Molecular Medicine, Osaka Women’s and Children’s Hospital, Izumi 594-1101, Japan; (Y.W.); (N.O.)
| | - Nobuhiko Okamoto
- Department of Molecular Medicine, Osaka Women’s and Children’s Hospital, Izumi 594-1101, Japan; (Y.W.); (N.O.)
- Department of Medical Genetics, Osaka Women’s and Children’s Hospital, Izumi 594-1101, Japan
| | - Hirotomo Saitsu
- Department of Biochemistry, Hamamatsu University School of Medicine, Hamamatsu 431-3192, Japan; (T.O.); (H.S.)
| | - Sachiko Nishina
- National Center for Child Health and Development, Department of Ophthalmology and Laboratory for Visual Science, Tokyo 157-8535, Japan; (N.A.); (S.N.)
| | - Yoshihiro Hotta
- Department of Ophthalmology, Hamamatsu University School of Medicine, Hamamatsu 431-3192, Japan; (N.T.); (K.H.); (S.N.); (S.A.); (K.T.); (K.K.); (M.S.)
- Correspondence: ; Tel.: +81-53-435-2256
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PHENOTYPE-GUIDED GENETIC TESTING OF PEDIATRIC INHERITED RETINAL DISEASE IN THE UNITED ARAB EMIRATES. Retina 2021; 40:1829-1837. [PMID: 31725702 DOI: 10.1097/iae.0000000000002675] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
PURPOSE Inherited retinal disease is relatively common in the Arabian Gulf, but details regarding pediatric inherited retinal disease in the region are lacking. The purpose of this study is to report the experience of a regional Ocular Genetics Service with childhood-onset inherited retinal disease in the United Arab Emirates. METHODS Retrospective series of consecutive Emirati patients referred to the Ocular Genetics Service of Cleveland Clinic Abu Dhabi over a 3-year period (2016-2018) who were diagnosed with childhood-onset inherited retinal disease (onset before 16 years old) and underwent diagnostic genetic testing guided by clinical phenotype (single gene, next-generation panel, or exome sequencing). RESULTS Seventy-one probands were identified (38 male and 33 females), the majority of whom were symptomatic with visual problems within the first 5 years of life. All patients had disease causing mutations in 1 of 26 retinal disease genes. Recessive disease was frequently due to homozygous mutations. The most frequently mutated genes (and number of probands) were ABCA4 (14), KCNV2 (8), CRB1 (6), and CNGA3 (5). Recurrent specific gene mutations included ABCA4 p.Gly1961Glu/p.Leu857Pro, KCNV2 p.Glu143*, MERTK p.Cys738Trpfs*32, and RS1 c.52+3A>G. Some probands had mutations in syndromic genes and were confirmed to have extraocular findings. CONCLUSION Phenotype-guided genetic testing had a remarkable yield for this patient population. Recessive disease is often from homozygous mutations. Cone-dominated phenotypes are common. There are apparent founder mutations for several genes that could be used in a targeted genetic testing strategy. Molecular diagnosis is particularly important in affected children when inherited retinal dystrophy could be a sign of syndromic disease as proper earlier diagnosis minimizes potential extraocular morbidity.
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Etzel JD, Neely KA, Ely AL. Congenital glycosylation disorder: a novel presentation of coexisting anterior and posterior segment pathology and its implications in pediatric cataract management. J AAPOS 2019; 23:297-300. [PMID: 31153949 DOI: 10.1016/j.jaapos.2019.05.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Revised: 05/17/2019] [Accepted: 05/24/2019] [Indexed: 10/26/2022]
Abstract
We report a case exhibiting the coexistence of anterior and posterior segment pathology in the same eye secondary to a congenital disorder of glycosylation resulting from a DPAGT1 gene mutation. This case details a novel gene mutation in a male infant found to have bilateral congenital cataracts, removed at 6 and 7 weeks of life, only to uncover bilateral retinal and optic atrophy. Our report highlights issues of surgical timing for syndrome-related pediatric cataracts, given the risks related to secondary glaucoma versus deprivation amblyopia, in an infant born with both cataracts and vision-limiting posterior segment pathology.
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Affiliation(s)
- Justin D Etzel
- Department of Ophthalmology, Krieger Eye Institute at Sinai Hospital, Baltimore, Maryland
| | - Kimberly A Neely
- Department of Ophthalmology, Penn State Health Milton S. Hershey Medical Center, Hershey, Pennsylvania
| | - Amanda L Ely
- Department of Ophthalmology, Penn State Health Milton S. Hershey Medical Center, Hershey, Pennsylvania.
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