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Panchal NK, Bhale A, Verma VK, Beevi SS. Computational and molecular dynamics simulation approach to analyze the impactof XPD gene mutation on protein stability and function. MOLECULAR SIMULATION 2020. [DOI: 10.1080/08927022.2020.1810852] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Nagesh Kishan Panchal
- Cancer Biology Division, KIMS Foundation and Research Centre, KIMS Hospitals, Secunderabad, India
| | - Aishwarya Bhale
- Cancer Biology Division, KIMS Foundation and Research Centre, KIMS Hospitals, Secunderabad, India
| | - Vinod Kumar Verma
- Cancer Biology Division, KIMS Foundation and Research Centre, KIMS Hospitals, Secunderabad, India
| | - Syed Sultan Beevi
- Cancer Biology Division, KIMS Foundation and Research Centre, KIMS Hospitals, Secunderabad, India
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2
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Amin M, Elsayed L, Ahmed AE. Clinical and Genetic Characteristics of Leukodystrophies in Africa. J Neurosci Rural Pract 2019; 8:S89-S93. [PMID: 28936078 PMCID: PMC5602269 DOI: 10.4103/jnrp.jnrp_511_16] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Recent understanding of the genetic basis of neurological disorders in Africa has grown rapidly in the last two decades. Africa harbors the largest genetic repertoire in the world which gives unique opportunity to discover novel variant, genes, and molecular pathways associated with various neurological diseases. Despite that, large-scale genomic and exome studies are severely lacking especially for neglected diseases such as leukodystrophies. This review aims to shed light on the currently developed research in leukodystrophies in Africa. We reviewed all research articles related to “Leukodystrophy in Africa” published in Medline/PubMed and Google Scholar databases up to date. We found very few studies in leukodystrophy from Africa, especially from the Sub-Saharan regions. Metachromatic leukodystrophy was the most studied type of leukodystrophy. Published studies from North Africa (Tunisia, Morocco, and Egypt) were very limited in either sample size (case studies or single/few family studies) or molecular methods (targeted sequencing or polymerase chain reaction-restriction fragment length polymorphisms). More studies (GWAS or large family studies) with advanced techniques such as exome or whole genome sequencing are needed to unveil the genetic basis of leukodystrophy in Africa. Unmasking novel genes and molecular pathways of leukodystrophies invariably lead to better detection and treatment for both Africans and worldwide populations.
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Affiliation(s)
- Mutaz Amin
- Department of Biochemistry, Faculty of Medicine, University of Khartoum, Khartoum, Sudan
| | - Liena Elsayed
- Department of Biochemistry, Faculty of Medicine, University of Khartoum, Khartoum, Sudan
| | - Ammar Eltahir Ahmed
- Department of Physiology, Faculty of Medicine, University of Khartoum, Khartoum, Sudan
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Thirumal Kumar D, Eldous HG, Mahgoub ZA, George Priya Doss C, Zayed H. Computational modelling approaches as a potential platform to understand the molecular genetics association between Parkinson's and Gaucher diseases. Metab Brain Dis 2018; 33:1835-1847. [PMID: 29978341 DOI: 10.1007/s11011-018-0286-3] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/28/2018] [Accepted: 06/29/2018] [Indexed: 12/18/2022]
Abstract
Gaucher's disease (GD) is a genetic disorder in which glucocerebroside accumulates in cells and specific organs. It is broadly classified into type I, type II and type III. Patients with GD are at high risk of Parkinson's disease (PD), and the clinical and pathological presentation of GD patients with PD is almost identical to idiopathic PD. Several experimental models like cell culture, animal models, and transgenic mice models were used to understand the molecular mechanism behind GD and PD association; however, such mechanism remains unclear. In this context, based on literature reports, we identified the most common mutations K198T, E326K, T369M, N370S, V394L, D409H, L444P, and R496H, in the Glucosylceramidase (GBA) protein that are known to cause GD1, and represent a risk of developing PD. However, to date, no computational analyses have designed to elucidate the potential functional role of GD mutations with increased risk of PD. The present computational pipeline allows us to understand the structural and functional significance of these GBA mutations with PD. Based on the published data, the most common and severe mutations were E326K, N370S, and L444P, which further selected for our computational analysis. PredictSNP and iStable servers predicted L444P mutant to be the most deleterious and responsible for the protein destabilization, followed by the N370S mutation. Further, we used the structural analysis and molecular dynamics approach to compare the most frequent deleterious mutations (N370S and L444P) with the mild mutation E326K. The structural analysis demonstrated that the location of E326K and N370S in the alpha helix region of the protein whereas the mutant L444P was in the starting region of the beta sheet, which might explain the predicted pathogenicity level and destabilization effect of the L444P mutant. Finally, Molecular Dynamics (MD) at 50 ns showed the highest deviation and fluctuation pattern in the L444P mutant compared to the two mutants E326K and N370S and the native protein. This was consistent with more loss of intramolecular hydrogen bonds and less compaction of the radius of gyration in the L444P mutant. The proposed study is anticipated to serve as a potential platform to understand the mechanism of the association between GD and PD, and might facilitate the process of drug discovery against both GD and PD.
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Affiliation(s)
- D Thirumal Kumar
- School of Bio Sciences and Technology, Vellore Institute of Technology, Vellore, Tamil Nadu, 632014, India
| | - Hend Ghasan Eldous
- College of Health Sciences, Department of Biomedical Sciences, Qatar University, Doha, Qatar
| | - Zainab Alaa Mahgoub
- College of Health Sciences, Department of Biomedical Sciences, Qatar University, Doha, Qatar
| | - C George Priya Doss
- School of Bio Sciences and Technology, Vellore Institute of Technology, Vellore, Tamil Nadu, 632014, India.
| | - Hatem Zayed
- College of Health Sciences, Department of Biomedical Sciences, Qatar University, Doha, Qatar.
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Thirumal Kumar D, Umer Niazullah M, Tasneem S, Judith E, Susmita B, George Priya Doss C, Selvarajan E, Zayed H. A computational method to characterize the missense mutations in the catalytic domain of GAA protein causing Pompe disease. J Cell Biochem 2018; 120:3491-3505. [DOI: 10.1002/jcb.27624] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Accepted: 08/14/2018] [Indexed: 12/12/2022]
Affiliation(s)
- D Thirumal Kumar
- Department of Integrative Biology School of Bio Sciences and Technology, Vellore Institute of Technology Vellore Tamil Nadu India
| | - Maryam Umer Niazullah
- Department of Biomedical Sciences College of Health and Sciences, Qatar University Doha Qatar
| | - Sadia Tasneem
- Department of Biomedical Sciences College of Health and Sciences, Qatar University Doha Qatar
| | - E Judith
- Department of Integrative Biology School of Bio Sciences and Technology, Vellore Institute of Technology Vellore Tamil Nadu India
| | - B Susmita
- Department of Integrative Biology School of Bio Sciences and Technology, Vellore Institute of Technology Vellore Tamil Nadu India
| | - C George Priya Doss
- Department of Integrative Biology School of Bio Sciences and Technology, Vellore Institute of Technology Vellore Tamil Nadu India
| | - E Selvarajan
- Department of Genetic engineering School of Bioengineering, SRM Institute of Science and Technology Kattankulathur Chennai India
| | - Hatem Zayed
- Department of Biomedical Sciences College of Health and Sciences, Qatar University Doha Qatar
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Mosaeilhy A, Mohamed MM, C GPD, El Abd HSA, Gamal R, Zaki OK, Zayed H. Genotype-phenotype correlation in 18 Egyptian patients with glutaric acidemia type I. Metab Brain Dis 2017; 32:1417-1426. [PMID: 28389991 DOI: 10.1007/s11011-017-0006-4] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/07/2017] [Accepted: 03/29/2017] [Indexed: 11/26/2022]
Abstract
Glutaric acidemia I (GAI) is an autosomal recessive metabolic disease caused by a deficiency of glutaryl-CoA dehydrogenase enzyme (GCDH). Patients with GAI are characterized by macrocephaly, acute encephalitis-like crises, dystonia and frontotemporal atrophy. In this study, we investigated 18 Egyptian patients that were diagnosed with GAI based on their clinical, neuroradiological, and biochemical profiles. Of the 18 patients, 16 had developmental delay and/or regression, dystonia was prominent in 75% of the cases, and three patients died. Molecular genetics analysis identified 14 different mutations in the GCDH gene in the 18 patients, of the 14 mutations, nine were missense, three were in the 3'-Untranslated Region (3'-UTR), one was nonsense, and one was a silent mutation. Four novel mutations were identified (c.148 T > A; p.Trp50Arg, c.158C > A; p.Pro53Gln, c.1284C > G; p.Ile428Met, and c.1189G > T; p.Glu397*) that were all absent in 300 normal chromosomes. The 3'-UTR mutation (c.*165A > G; rs8012), was the most frequent mutation observed (0.5; 18/36), followed by the most common mutation among Caucasian patients (p.Arg402Trp; rs121434369) with allele frequency of 0.36 (13/36), and the 3'-UTR mutation (c.*288G > T; rs9384, 0.22; 8/16). The p.Arg257Gln mutation was found with allele frequency of ~0.17 (6/36). The marked homozygosity observed in our patients is probably due to the high level of consanguinity that is observed in 100% of the cases. We used nine in silico prediction tools to predict the pathogenicity (SIFT, PhD-SNP, SNAP, Meta-SNP, PolyPhen2, and Align GVGD) and protein stability (I-Mutant2.0, Mupro, and istable) of the nine missense mutants. The mutant p.Arg402Trp was predicted to be most deleterious by all the six pathogenicity prediction tools and destabilizing by all the three-stability prediction tools, and highly conserved by the ConSurf server. Using the clinical, biochemical, family history of the 18 patients, and the in silico analysis of the missense mutations, our study showed a mix of conclusive and inconclusive genotype-phenotype correlations among our patient's cohort and suggests the usefulness of using various sophisticated computational analysis to be utilized for future variant classifications in the genetic clinics.
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Affiliation(s)
- Ahmed Mosaeilhy
- Medical Genetics Unit, Pediatric Department, Faculty of Medicine, Ain-Shams University, Cairo, Egypt
| | - Magdy M Mohamed
- Department of Biochemistry, Faculty of Medicine, Ain Shams University, Cairo, Egypt
| | - George Priya Doss C
- Department of Integrative Biology, School of BioSciences and Technology, VIT- University, Vellore, India
| | - Heba S A El Abd
- Medical Genetics Unit, Pediatric Department, Faculty of Medicine, Ain-Shams University, Cairo, Egypt
| | - Radwa Gamal
- Medical Genetics Unit, Pediatric Department, Faculty of Medicine, Ain-Shams University, Cairo, Egypt
| | - Osama K Zaki
- Medical Genetics Unit, Pediatric Department, Faculty of Medicine, Ain-Shams University, Cairo, Egypt.
- Genetics Unit, Ain Shams Pediatrics Hospital, Cairo, 11566, Egypt.
| | - Hatem Zayed
- Department of Biomedical Sciences, College of Health and Sciences, Qatar University, Doha, Qatar.
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Zaki OK, Krishnamoorthy N, El Abd HS, Harche SA, Mattar RA, Al Disi RS, Nofal MY, El Bekay R, Ahmed KA, George Priya Doss C, Zayed H. Two patients with Canavan disease and structural modeling of a novel mutation. Metab Brain Dis 2017; 32:171-177. [PMID: 27531131 DOI: 10.1007/s11011-016-9896-9] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Accepted: 08/08/2016] [Indexed: 10/21/2022]
Abstract
Canavan disease (CD) is a rare fatal childhood neurological autosomal recessive genetic disease caused by mutations in the ASPA gene, which lead to catalytic deficiency of the ASPA enzyme, which catalyzes the hydrolysis of N-acetyl-L-aspartate (NAA) into aspartate and acetate. CD occurs frequently among Ashkenazi Jewish population, however it has been reported in many other ethnic groups with significantly lower frequency. Here, we report on two Egyptian patients diagnosed with CD, the first patient harbors five missense mutations (c.427 A > G; p. I143V, c.502C > T; p. R168C, c.530 T > C; p. I177T, c.557 T > C; p. V186D c.548C > T; p. P183L) and a silent mutation (c.693 C > T; p. Y231Y). The second patient was found to be homozygous for two missense mutations (c.427 A > G; p. I143V and c.557 T > A; p. V186D). Furthermore, molecular modeling of the novel mutation p. P183L provides an instructive explanation of the mutational impact on the protein structure that can affect the function of the ASPA. Here, the clinical, radiological, and biochemical profile of the two patients are reviewed in details.
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Affiliation(s)
- Osama K Zaki
- Medical Genetics Unit, Pediatric Department, Faculty of Medicine, Ain Shams University Hospital, Cairo, 11665, Egypt.
| | - Navaneethakrishnan Krishnamoorthy
- Division of Experimental Genetics, Sidra Medical and Research Centre, Qatar Foundation, Doha, Qatar
- Heart Science Centre, National Heart and Lung Institute, Imperial College London, Harefield, UK
| | - Heba S El Abd
- Medical Genetics Unit, Pediatric Department, Faculty of Medicine, Ain Shams University Hospital, Cairo, 11665, Egypt
| | - Soumaya A Harche
- Department of Biomedical Sciences, College of Health Sciences, Qatar University, Doha, Qatar
| | - Reem A Mattar
- Department of Biomedical Sciences, College of Health Sciences, Qatar University, Doha, Qatar
| | - Rana S Al Disi
- Department of Biomedical Sciences, College of Health Sciences, Qatar University, Doha, Qatar
| | - Mariam Y Nofal
- Department of Biomedical Sciences, College of Health Sciences, Qatar University, Doha, Qatar
| | - Rajaa El Bekay
- Laboratory of Biomedical Research, Virgen de la Victoria Clinical University Hospital, 29010, Málaga, Spain
| | - Khalid A Ahmed
- Medical Genetics Unit, Pediatric Department, Faculty of Medicine, Ain Shams University Hospital, Cairo, 11665, Egypt
| | - C George Priya Doss
- Department of Integrative Biology, School of Biosciences and Technology, VIT- University, Vellore, India
| | - Hatem Zayed
- Department of Biomedical Sciences, College of Health Sciences, Qatar University, Doha, Qatar.
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Jurdáková H, Górová R, Addová G, Behúlová D, Ostrovský I. The state of treatment approach and diagnostics in Canavan disease with focus on the determination of N-acetylasparic acid. CHEMICAL PAPERS 2017. [DOI: 10.1007/s11696-016-0033-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Krishnamoorthy N, Zayed H. Structural modeling of p.V31F variant in the aspartoacylase gene. Metab Brain Dis 2016; 31:723-6. [PMID: 26797702 DOI: 10.1007/s11011-016-9796-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/03/2015] [Accepted: 01/18/2016] [Indexed: 10/22/2022]
Abstract
Aspartoacylase (ASPA) is an abundant enzyme in the brain, which catalyzes the conversion of N-acetylaspartate into acetate and aspartate, deficiency in its activity leads to degeneration of the white matter of the brain and is a recognized cause of Canavan disease (CD), which affect children. Although genotype-phenotype correlation have been reported for Canavan disease patients, this relationships is still not straightforward. In this communication, we use molecular modeling to address the structural consequences resulting from the missense variant p.V31F in the ASPA enzyme, which we previously reported in a homozygous form in an Egyptian patient with infantile CD. This modeling suggests that this variant brings significant changes to the catalytic core by introducing structural flexibility through neighbouring key residues. In particular, it provides a molecular explanation for the pathogenic effect of this variant and provides a meaningful genotype-phonotype relationships. The mutational impact appears to have an influence on the function of the protein and initiates molecular event for the mechanism of the disease.
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Affiliation(s)
- Navaneethakrishnan Krishnamoorthy
- Cardiovascular Research Division, Sidra Medical and Research Centre, Qatar Foundation, Doha, Qatar
- Heart Science Centre, National Heart and Lung Institute, Imperial College London, Harefield, UK
| | - Hatem Zayed
- College of Health Sciences, Biomedical Program, Qatar University, Doha, Qatar.
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