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Elsayed LEO, Mohammed IN, Hamed AAA, Elseed MA, Johnson A, Mairey M, Mohamed HESA, Idris MN, Salih MAM, El-Sadig SM, Koko ME, Mohamed AYO, Raymond L, Coutelier M, Darios F, Siddig RA, Ahmed AKMA, Babai AMA, Malik HMO, Omer ZMBM, Mohamed EOE, Eltahir HB, Magboul NAA, Bushara EE, Elnour A, Rahim SMA, Alattaya A, Elbashir MI, Ibrahim ME, Durr A, Audhya A, Brice A, Ahmed AE, Stevanin G. Hereditary spastic paraplegias: identification of a novel SPG57 variant affecting TFG oligomerization and description of HSP subtypes in Sudan. Eur J Hum Genet 2016; 25:100-110. [PMID: 27601211 DOI: 10.1038/ejhg.2016.108] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2015] [Revised: 05/31/2016] [Accepted: 06/14/2016] [Indexed: 12/11/2022] Open
Abstract
Hereditary spastic paraplegias (HSP) are the second most common type of motor neuron disease recognized worldwide. We investigated a total of 25 consanguineous families from Sudan. We used next-generation sequencing to screen 74 HSP-related genes in 23 families. Linkage analysis and candidate gene sequencing was performed in two other families. We established a genetic diagnosis in six families with autosomal recessive HSP (SPG11 in three families and TFG/SPG57, SACS and ALS2 in one family each). A heterozygous mutation in a gene involved in an autosomal dominant HSP (ATL1/SPG3A) was also identified in one additional family. Six out of seven identified variants were novel. The c.64C>T (p.(Arg22Trp)) TFG/SPG57 variant (PB1 domain) is the second identified that underlies HSP, and we demonstrated its impact on TFG oligomerization in vitro. Patients did not present with visual impairment as observed in a previously reported SPG57 family (c.316C>T (p.(Arg106Cys)) in coiled-coil domain), suggesting unique contributions of the PB1 and coiled-coil domains in TFG complex formation/function and a possible phenotype correlation to variant location. Some families manifested marked phenotypic variations implying the possibility of modifier factors complicated by high inbreeding. Finally, additional genetic heterogeneity is expected in HSP Sudanese families. The remaining families might unravel new genes or uncommon modes of inheritance.
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Affiliation(s)
- Liena E O Elsayed
- Institut du Cerveau et de la Moelle épinière, INSERM U1127, CNRS UMR7225, Sorbonne Universités, UPMC Université Paris VI UMR_S1127, Paris, France.,Ecole Pratique des Hautes Etudes, EPHE, PSL université, Paris, France.,University of Khartoum, Khartoum, Sudan
| | | | | | | | - Adam Johnson
- Department of Biomolecular Chemistry, University of Wisconsin-Madison School of Medicine and Public Health, Madison, WI, USA
| | - Mathilde Mairey
- Institut du Cerveau et de la Moelle épinière, INSERM U1127, CNRS UMR7225, Sorbonne Universités, UPMC Université Paris VI UMR_S1127, Paris, France.,Ecole Pratique des Hautes Etudes, EPHE, PSL université, Paris, France
| | | | - Mohamed N Idris
- University of Khartoum, Khartoum, Sudan.,Sudan Medical Council, Neurology, Sudan
| | - Mustafa A M Salih
- Division of Pediatric Neurology, Department of Pediatrics, College of Medicine, King Saud University, Riyadh, Saudi Arabia
| | - Sarah M El-Sadig
- University of Khartoum, Khartoum, Sudan.,Department of Neurology, Soba University Hospital, Khartoum, Sudan
| | - Mahmoud E Koko
- Department of Molecular Biology, Institute of Endemic Diseases, University of Khartoum, Khartoum, Sudan
| | - Ashraf Y O Mohamed
- Department of Biochemistry, Faculty of Medicine, National University, Khartoum, Sudan
| | - Laure Raymond
- Institut du Cerveau et de la Moelle épinière, INSERM U1127, CNRS UMR7225, Sorbonne Universités, UPMC Université Paris VI UMR_S1127, Paris, France.,Ecole Pratique des Hautes Etudes, EPHE, PSL université, Paris, France.,Department of genetics, APHP Pitié-Salpêtrière Hospital, Paris, France
| | - Marie Coutelier
- Institut du Cerveau et de la Moelle épinière, INSERM U1127, CNRS UMR7225, Sorbonne Universités, UPMC Université Paris VI UMR_S1127, Paris, France.,Ecole Pratique des Hautes Etudes, EPHE, PSL université, Paris, France
| | - Frédéric Darios
- Institut du Cerveau et de la Moelle épinière, INSERM U1127, CNRS UMR7225, Sorbonne Universités, UPMC Université Paris VI UMR_S1127, Paris, France
| | | | | | | | | | | | | | - Hanan B Eltahir
- Department of Biochemistry, El Imam EL Mahdi University, Kosti, Sudan
| | | | | | | | | | | | | | - Muntaser E Ibrahim
- Department of Molecular Biology, Institute of Endemic Diseases, University of Khartoum, Khartoum, Sudan
| | - Alexandra Durr
- Institut du Cerveau et de la Moelle épinière, INSERM U1127, CNRS UMR7225, Sorbonne Universités, UPMC Université Paris VI UMR_S1127, Paris, France.,Department of genetics, APHP Pitié-Salpêtrière Hospital, Paris, France
| | - Anjon Audhya
- Department of Biomolecular Chemistry, University of Wisconsin-Madison School of Medicine and Public Health, Madison, WI, USA
| | - Alexis Brice
- Institut du Cerveau et de la Moelle épinière, INSERM U1127, CNRS UMR7225, Sorbonne Universités, UPMC Université Paris VI UMR_S1127, Paris, France. .,Department of genetics, APHP Pitié-Salpêtrière Hospital, Paris, France.
| | - Ammar E Ahmed
- University of Khartoum, Khartoum, Sudan.,Sudan Medical Council, Neurology, Sudan
| | - Giovanni Stevanin
- Institut du Cerveau et de la Moelle épinière, INSERM U1127, CNRS UMR7225, Sorbonne Universités, UPMC Université Paris VI UMR_S1127, Paris, France. .,Ecole Pratique des Hautes Etudes, EPHE, PSL université, Paris, France. .,Department of genetics, APHP Pitié-Salpêtrière Hospital, Paris, France.
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Abstract
Heredoataxias are a group of genetic disorders with a cerebellar syndrome as the leading clinical manifestation. The current classification distinguishes heredoataxias according to the trait of inheritance into autosomal dominant, autosomal recessive, X-linked, and maternally inherited heredoataxias. The autosomal dominant heredoataxias are separated into spinocerebellar ataxias (SCA1-8, 10-15, 17-23, 25-30, and dentato-rubro-pallido-luysian atrophy), episodic ataxias (EA1-7), and autosomal dominant mitochondrial heredoataxias (Leigh syndrome, MIRAS, ADOAD, and AD-CPEO). The autosomal recessive ataxias are separated into Friedreich ataxia, ataxia due to vitamin E deficiency, ataxia due to Abeta-lipoproteinemia, Refsum disease, late-onset Tay-Sachs disease, cerebrotendineous xanthomatosis, spinocerebellar ataxia with axonal neuropathy, ataxia telangiectasia, ataxia telangiectasia-like disorder, ataxia with oculomotor apraxia 1 and 2, spastic ataxia of Charlevoix-Saguenay, Cayman ataxia, Marinesco-Sjögren syndrome, and autosomal recessive mitochondrial ataxias (AR-CPEO, SANDO, SCAE, AHS, IOSCA, MEMSA, LBSL CoQ-deficiency, PDC-deficiency). Only two of the heredoataxias, fragile X/tremor/ataxia syndrome, and XLSA/A are transmitted via an X-linked trait. Maternally inherited heredoataxias are due to point mutations in genes encoding for tRNAs, rRNAs, respiratory chain subunits or single large scale deletions/duplications of the mitochondrial DNA and include MELAS, MERRF, KSS, PS, MILS, NARP, and non-syndromic mitochondrial disorders. Treatment of heredoataxias is symptomatic and supportive and may have a beneficial effect in single patients.**Please see page 424 for abbreviation list.
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Yang WZ, Zhang Y, Wu F, Zhang M, Cho SC, Li CZ, Li SH, Shu GJ, Sheng YX, Zhao N, Tang Y, Jiang S, Jiang S, Gandjian M, Ichim TE, Hu X. Human umbilical cord blood-derived mononuclear cell transplantation: case series of 30 subjects with hereditary ataxia. J Transl Med 2011; 9:65. [PMID: 21575250 PMCID: PMC3112442 DOI: 10.1186/1479-5876-9-65] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2011] [Accepted: 05/16/2011] [Indexed: 12/27/2022] Open
Abstract
Background The differential diagnosis for hereditary ataxia encompasses a variety of diseases characterized by both autosomal dominant and recessive inheritance. There are no curative treatments available for these neurodegenerative conditions. This open label treatment study used human umbilical cord blood-derived mononuclear cells (CBMC) combined with rehabilitation training as potential disease modulators. Methods 30 patients suffering from hereditary ataxia were treated with CBMCs administered systemically by intravenous infusion and intrathecally by either cervical or lumbar puncture. Primary endpoint measures were the Berg Balance Scale (BBS), serum markers of immunoglobulin and T-cell subsets, measured at baseline and pre-determined times post-treatment. Results A reduction of pathological symptoms and signs was shown following treatment. The BBS scores, IgG, IgA, total T cells and CD3+CD4 T cells all improved significantly compared to pre-treatment values (P < 0.01~0.001). There were no adverse events. Conclusion The combination of CBMC infusion and rehabilitation training may be a safe and effective treatment for ataxia, which dramatically improves patients' functional symptoms. These data support expanded double blind, placebo-controlled studies for these treatment modalities.
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Affiliation(s)
- Wan-Zhang Yang
- Shenzhen Beike Cell Engineering Research Institution, Shenzhen, China
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