scholarly journals A Pyramidal Cause of a Cerebellar Ataxia: HSP-7

2020 ◽  
Vol 12 (3) ◽  
pp. 329-333
Author(s):  
Tjerk Joppe Lagrand ◽  
Gerard Hageman
Keyword(s):  
Exome Sequencing ◽  
Cerebellar Ataxia ◽  
Hereditary Spastic Paraplegia ◽  
Diagnostic Process ◽  
Spastic Paraplegia ◽  
Ataxic Gait ◽  
Coordination Problems ◽  
Radiological Appearance ◽  
Whole Exome ◽  
Diffuse Atrophy

A 43-year-old man presented with a slowly progressive fatigue and coordination problems, coupled with a radiological appearance of diffuse atrophy, especially in the cerebellar hemispheres. The diagnostic process was challenging because initially the additional investigations were focused on a cerebellar ataxia. In the following months, his ataxic gait developed in a more spastic pattern and whole exome sequencing revealed mutations in the SPG7 gene, confirming a diagnosis of hereditary spastic paraplegia. Therefore, the authors call for an extension of genetic panels in ataxia patients.

scholarly journals A novel SPAST gene mutation identified in a Chinese family with hereditary spastic paraplegia

2020 ◽  
Author(s):  
Weiwei Yu ◽  
Haiqiang Jin ◽  
Jianwen Deng ◽  
Ding Nan ◽  
Yining Huang
Keyword(s):  
Exome Sequencing ◽  
Whole Exome Sequencing ◽  
Hereditary Spastic Paraplegia ◽  
Dna Isolation ◽  
Tertiary Structure ◽  
Novel Mutation ◽  
Chinese Family ◽  
Spastic Paraplegia ◽  
Whole Exome ◽  
And Function

Abstract Background: Hereditary spastic paraplegia is a heterogeneous group of clinically and genetically neurodegenerative diseases characterized by progressive gait disorder. Hereditary spastic paraplegia can be inherited in various ways, and all modes of inheritance are associated with multiple genes or loci. At present, more than 76 disease-causing loci have been identified in hereditary spastic paraplegia patients. Here, we report a novel mutation in SPAST gene associated with hereditary spastic paraplegia in a Chinese family, further enriching the hereditary spastic paraplegia spectrum. Methods: Whole genomic DNA was extracted from peripheral blood of the 15 subjects from a Chinese family using DNA Isolation Kit. The Whole Exome Sequencing of the proband was analyzed and the result was identified in the rest individuals. RaptorX prediction tool and Protein Variation Effect Analyzer were used to predict the effects of the mutation on protein tertiary structure and function.Results: Spastic paraplegia has been inherited across at least four generations in this family, during which only four HSP patients were alive. The results obtained by analyzing the Whole Exome Sequencing of the proband exhibited a novel disease-associated in-frame deletion in the SPAST gene, and the this mutation also existed in the rest three HSP patients in this family. This in-frame deletion consists of three nucleotides deletion (c.1710_1712delGAA) within the exon 16, resulting in lysine deficiency at the position 570 of the protein (p.K570del). This novel mutation was also predicted to result in the synthesis of misfolded SPAST protein and have the deleterious effect on the function of SPAST protein.Conclusion: In this case, we reported a novel mutation in the known SPAST gene that segregated with HSP disease, which can be inherited in each generation. Simultaneously, this novel discovery significantly enriches the mutation spectrum, which provides an opportunity for further investigation of genetic pathogenesis of HSP.

Identification of a novel homozygous SPG7 mutation by whole exome sequencing in a Greek family with a complicated form of hereditary spastic paraplegia

2015 ◽  
Vol 58 (11) ◽  
pp. 573-577 ◽  
Author(s):  
Hussein Daoud ◽  
Eleni Merkouri Papadima ◽  
Bouchra Ouled Amar Bencheikh ◽  
Theodora Katsila ◽  
Alexandre Dionne-Laporte ◽  
...  
Keyword(s):  
Exome Sequencing ◽  
Whole Exome Sequencing ◽  
Hereditary Spastic Paraplegia ◽  
Spastic Paraplegia ◽  
Whole Exome ◽  
Complicated Form

A p.Arg499His Mutation in SPAST Is Associated with Infantile Onset Ascending Spastic Paralysis Complicated with Dysarthria and Anarthria

2019 ◽  
Vol 50 (06) ◽  
pp. 391-394
Author(s):  
Masashi Ogasawara ◽  
Takashi Saito ◽  
Eriko Koshimizu ◽  
Noriyuki Akasaka ◽  
Masayuki Sasaki
Keyword(s):  
Differential Diagnosis ◽  
Exome Sequencing ◽  
Hereditary Spastic Paraplegia ◽  
De Novo ◽  
Respiratory Muscles ◽  
Spastic Paraplegia ◽  
Spastic Paralysis ◽  
Whole Exome ◽  
Leg Stiffness ◽  
Similar Phenotype

AbstractThe complication of anarthria in hereditary spastic paraplegia (HSP) patients has been reported to result from mutations in either ALS2 or FA2H. Here, we present a case of a 12-year-old boy with hereditary spastic paralysis and anarthria associated with a SPAST mutation. Initial presentation was at 14 months of age, when the patient experienced leg stiffness. At 3 years of age, he could speak well using sentences. At 9 years of age, he was found to have dysarthria and had difficulty writing. At 12 years of age, the ability to speak was lost. The patient could not vocalize any words, despite contraction of his neck and respiratory muscles during attempted vocalization. Additionally, the patient has never walked independently in his life. Considering these symptoms, we diagnosed him as having infantile onset ascending hereditary spastic paralysis (IAHSP) complicated with anarthria. By whole-exome sequencing, we discovered a heterozygous SPAST mutation c.1496G > A (p.Arg499His), which was not found in the parents and is probably de novo. This mutation was already repeatedly described with similar phenotype. Our results suggest that the p.Arg499His mutation in SPAST should be considered as a differential diagnosis in IAHSP.

scholarly journals A novel SPAST gene mutation identified in a Chinese family with hereditary spastic paraplegia

2020 ◽  
Author(s):  
Weiwei Yu ◽  
Haiqiang Jin ◽  
Jianwen Deng ◽  
Ding Nan ◽  
Yining Huang
Keyword(s):  
Exome Sequencing ◽  
Whole Exome Sequencing ◽  
Hereditary Spastic Paraplegia ◽  
Dna Isolation ◽  
Tertiary Structure ◽  
Novel Mutation ◽  
Chinese Family ◽  
Spastic Paraplegia ◽  
Whole Exome ◽  
And Function

Abstract Background: Hereditary spastic paraplegia is a heterogeneous group of clinically and genetically neurodegenerative diseases characterized by progressive gait disorder. Hereditary spastic paraplegia can be inherited in various ways, and all modes of inheritance are associated with multiple genes or loci. At present, more than 76 disease-causing loci have been identified in hereditary spastic paraplegia patients. Here, we report a novel mutation in SPAST gene associated with hereditary spastic paraplegia in a Chinese family, further enriching the hereditary spastic paraplegia spectrum. Methods: Whole genomic DNA was extracted from peripheral blood of the 15 subjects from a Chinese family using DNA Isolation Kit. The Whole Exome Sequencing of the proband was analyzed and the result was identified in the rest individuals. RaptorX prediction tool and Protein Variation Effect Analyzer were used to predict the effects of the mutation on protein tertiary structure and function.Results: Spastic paraplegia has been inherited across at least four generations in this family, during which only four HSP patients were alive. The results obtained by analyzing the Whole Exome Sequencing of the proband exhibited a novel disease-associated in-frame deletion in the SPAST gene, and the this mutation also existed in the rest three HSP patients in this family. This in-frame deletion consists of three nucleotides deletion (c.1710_1712delGAA) within the exon 16, resulting in lysine deficiency at the position 570 of the protein (p.K570del). This novel mutation was also predicted to result in the synthesis of misfolded SPAST protein and have the deleterious effect on the function of SPAST protein.Conclusion: In this case, we reported a novel mutation in the known SPAST gene that segregated with HSP disease, which can be inherited in each generation. Simultaneously, this novel discovery significantly enriches the mutation spectrum, which provides an opportunity for further investigation of genetic pathogenesis of HSP.

scholarly journals Dysfunctional Homozygous VRK1-D263G Variant Impairs the Assembly of Cajal Bodies and DNA Damage Response in Hereditary Spastic Paraplegia

2021 ◽  
Vol 7 (5) ◽  
pp. e624
Author(s):  
Patricia Morejon-Garcia ◽  
Boris Keren ◽  
Iñigo Marcos-Alcalde ◽  
Paulino Gomez-Puertas ◽  
Fanny Mochel ◽  
...  
Keyword(s):  
Dna Damage ◽  
Exome Sequencing ◽  
Whole Exome Sequencing ◽  
Dna Damage Response ◽  
Hereditary Spastic Paraplegia ◽  
Cajal Bodies ◽  
Spastic Paraplegia ◽  
Whole Exome ◽  
Damage Response ◽  
Variant Protein

Background and ObjectivesTo conduct a genetic and molecular functional study of a family with members affected of hereditary spastic paraplegia (HSP) of unknown origin and carrying a novel pathogenic vaccinia-related kinase 1 (VRK1) variant.MethodsWhole-exome sequencing was performed in 2 patients, and their parents diagnosed with HSP. The novel VRK1 variant was detected by whole-exome sequencing, molecularly modeled and biochemically characterized in kinase assays. Functionally, we studied the role of this VRK1 variant in DNA damage response and its effect on the assembly of Cajal bodies (CBs).ResultsWe have identified a very rare homozygous variant VRK1-D263G with a neurologic phenotype associated with HSP and moderate intellectual disability. The molecular modeling of this VRK1 variant protein predicted an alteration in the folding of a loop that interferes with the access to the kinase catalytic site. The VRK1-D263G variant is kinase inactive and does not phosphorylate histones H2AX and H3, transcription factors activating transcription factor 2 and p53, coilin needed for assembly of CBs, and p53 binding protein 1, a DNA repair protein. Functionally, this VRK1 variant protein impairs CB formation and the DNA damage response.DiscussionThis report expands the neurologic spectrum of neuromotor syndromes associated with a new and rare VRK1 variant, representing a novel pathogenic participant in complicated HSP and demonstrates that CBs and the DNA damage response are impaired in these patients.

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