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Zhong L, Gao X, Wang Y, Qiu W, Han L, Gu X, Zhang H. Clinical characteristics and genotypes of 201 patients with mucopolysaccharidosis type II in China: A retrospective, observational study. Clin Genet 2023; 103:655-662. [PMID: 36945845 DOI: 10.1111/cge.14329] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2023] [Revised: 03/09/2023] [Accepted: 03/12/2023] [Indexed: 03/23/2023]
Abstract
Mucopolysaccharidosis type II (MPS II) is an X-linked recessive lysosomal storage disease caused by a disease-associated variant in the IDS gene, which encodes iduronate 2-sulfatase (IDS). We aimed to characterize the clinical characteristics and genotypes of the largest cohort of Chinese patients with MPS II and so gain a deeper understanding of natural disease progression. Patients with confirmed MPS II and without treatment were included. The disease was classified as severe in patients with neurological impairment, and as attenuated in patients aged >6 years without neurological impairment. Of the 201 male patients, 78.1% had severe MPS II. Cognitive regression occurred before age 6 years in 94.3% of patients. Of 122 IDS variants identified, 37 were novel. Among the large gene alteration types identified, only the frequency of IDS-IDS2 recombination was significantly higher in severe versus attenuated MPS II (P = 0.032). Some identified point variants could inform the understanding of genotype-phenotype correlations. In conclusion, this study showed that classification of the disease as attenuated should only be made in patients aged >6 years. Our findings expand the understanding of the genotype-phenotype relationship, inform the diagnostic process, and provide an indication of the likely prognosis.
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Affiliation(s)
- Lin Zhong
- Pediatric Endocrinology and Genetic Metabolism, Xinhua Hospital, Shanghai Institute for Pediatric Research, Shanghai Jiao Tong University School of Medicine, 1665 Kongjiang Road, Shanghai, 200092, People's Republic of China
| | - Xiaolan Gao
- Pediatric Endocrinology and Genetic Metabolism, Xinhua Hospital, Shanghai Institute for Pediatric Research, Shanghai Jiao Tong University School of Medicine, 1665 Kongjiang Road, Shanghai, 200092, People's Republic of China
| | - Yu Wang
- Pediatric Endocrinology and Genetic Metabolism, Xinhua Hospital, Shanghai Institute for Pediatric Research, Shanghai Jiao Tong University School of Medicine, 1665 Kongjiang Road, Shanghai, 200092, People's Republic of China
| | - Wenjuan Qiu
- Pediatric Endocrinology and Genetic Metabolism, Xinhua Hospital, Shanghai Institute for Pediatric Research, Shanghai Jiao Tong University School of Medicine, 1665 Kongjiang Road, Shanghai, 200092, People's Republic of China
| | - Lianshu Han
- Pediatric Endocrinology and Genetic Metabolism, Xinhua Hospital, Shanghai Institute for Pediatric Research, Shanghai Jiao Tong University School of Medicine, 1665 Kongjiang Road, Shanghai, 200092, People's Republic of China
| | - Xuefan Gu
- Pediatric Endocrinology and Genetic Metabolism, Xinhua Hospital, Shanghai Institute for Pediatric Research, Shanghai Jiao Tong University School of Medicine, 1665 Kongjiang Road, Shanghai, 200092, People's Republic of China
| | - Huiwen Zhang
- Pediatric Endocrinology and Genetic Metabolism, Xinhua Hospital, Shanghai Institute for Pediatric Research, Shanghai Jiao Tong University School of Medicine, 1665 Kongjiang Road, Shanghai, 200092, People's Republic of China
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Zhao XY, Qiao GM, Liu F. Identification and structure characterization of novel IDS variants causing mucopolysaccharidosis type II: A retrospective analysis of 30 Chinese children. Clin Chim Acta 2021; 523:386-394. [PMID: 34670126 DOI: 10.1016/j.cca.2021.10.020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 10/14/2021] [Accepted: 10/15/2021] [Indexed: 10/20/2022]
Abstract
BACKGROUND Mucopolysaccharidosis type II (MPS II) or Hunter syndrome is a rare X-linked recessive genetic disease resulting from deficient activity of the iduronate-2-sulfatase(IDS) enzyme and the accumulation of glycosaminoglycans in almost all cells, tissues and organs, which makes viscera function impaired.This study retrospectively analyzed the clinical characteristics, leukocyte IDS activity and mutations in the IDS gene of 30 Chinese children with MPS II. METHODS Whole-exome sequencing (WES) was performed on samples of the 30 patients. RESULTS A total of 25 mutations were identified in the IDS genes including 16 previously reported and 9 novel mutations (6 frameshift: c.815-818dupAACG, c.1453dupA, c.1270-1271delGT, c.1484-1485insTA, c.854delA, c.12_13delCC;3missense: c.325 T > G, c.140 T > C, c.248 T > G).The computer simulations of the protein structure analysis of the novel missense mutations showed these amino acid replacements (W109G tryptophan replaced by the glycine, L47P leucine replaced by the proline, V83G valine replaced by glycine) near the active site of IDS protein sulfatase domain and would cause a severe impairment of protein structure and function. CONCLUSIONS Our study expands the spectrum of MPS II genotype, provides new insights into the molecular mechanisms of MPS II, and contributes to future studies of genotype-phenotypic associations to estimate prognosis and develop new treatment regimens.
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Affiliation(s)
- Xiao-Ying Zhao
- Department of Pediatrics, Hebei Medical University, Shijiazhuang 050000, Hebei, China
| | - Guang-Ming Qiao
- Department of Hematology, Children's Hospital of Integrated Traditional Chinese and Western Medicine, Shijiazhuang 050000, Hebei, China
| | - Fang Liu
- Department of Pediatrics, Hebei Medical University, Shijiazhuang 050000, Hebei, China; Department of Pediatrics, NICU, the 980th Hospital of the People's Liberation Army Joint Service Support Force, Shijiazhuang 050082, Hebei, China.
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McCaffrey TA, St Laurent G, Shtokalo D, Antonets D, Vyatkin Y, Jones D, Battison E, Nigg JT. Biomarker discovery in attention deficit hyperactivity disorder: RNA sequencing of whole blood in discordant twin and case-controlled cohorts. BMC Med Genomics 2020; 13:160. [PMID: 33115496 PMCID: PMC7594430 DOI: 10.1186/s12920-020-00808-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Accepted: 10/14/2020] [Indexed: 12/15/2022] Open
Abstract
Background A variety of DNA-based methods have been applied to identify genetic markers of attention deficit hyperactivity disorder (ADHD), but the connection to RNA-based gene expression has not been fully exploited. Methods Using well defined cohorts of discordant, monozygotic twins from the Michigan State University Twin Registry, and case-controlled ADHD cases in adolescents, the present studies utilized advanced single molecule RNA sequencing to identify expressed changes in whole blood RNA in ADHD. Multiple analytical strategies were employed to narrow differentially expressed RNA targets to a small set of potential biomarkers of ADHD.
Results RNA markers common to both the discordant twin study and case-controlled subjects further narrowed the putative targets, some of which had been previously associated with ADHD at the DNA level. The potential role of several differentially expressed genes, including ABCB5, RGS2, GAK, GIT1 and 3 members of the galactose metabolism pathway (GALE, GALT, GALK1) are substantiated by prior associations to ADHD and by established mechanistic connections to molecular pathways relevant to ADHD and behavioral control. Conclusions The convergence of DNA, RNA, and metabolic data suggests these may be promising targets for diagnostics and therapeutics in ADHD.
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Affiliation(s)
- Timothy A McCaffrey
- Division of Genomic Medicine, Department of Medicine, The George Washington University, 2300 Eye St., Washington, DC, 20037, USA. .,The St. Laurent Institute, Vancouver, WA, USA.
| | | | - Dmitry Shtokalo
- The St. Laurent Institute, Vancouver, WA, USA.,A.P. Ershov Institute of Informatics Systems, Novosibirsk, Russia.,AcademGene, LLC, Novosibirsk, Russia
| | - Denis Antonets
- A.P. Ershov Institute of Informatics Systems, Novosibirsk, Russia.,AcademGene, LLC, Novosibirsk, Russia
| | | | | | | | - Joel T Nigg
- Oregon Health and Science University, Portland, OR, USA
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Lin HY, Tu RY, Chern SR, Lo YT, Fran S, Wei FJ, Huang SF, Tsai SY, Chang YH, Lee CL, Lin SP, Chuang CK. Identification and Functional Characterization of IDS Gene Mutations Underlying Taiwanese Hunter Syndrome (Mucopolysaccharidosis Type II). Int J Mol Sci 2019; 21:ijms21010114. [PMID: 31877959 PMCID: PMC6982257 DOI: 10.3390/ijms21010114] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2019] [Revised: 12/05/2019] [Accepted: 12/19/2019] [Indexed: 12/24/2022] Open
Abstract
Hunter syndrome (mucopolysaccharidosis II; MPS II) is caused by a defect of the iduronate-2-sulfatase (IDS) gene. Few studies have reported integrated mutation data of Taiwanese MPS II phenotypes. In this study, we summarized genotype and phenotype correlations of confirmed MPS II patients and asymptomatic MPS II infants in Taiwan. Regular polymerase chain reaction and DNA sequencing were used to identify genetic abnormalities of 191 cases, including 51 unrelated patients with confirmed MPS II and 140 asymptomatic infants. IDS activity was analyzed in individual novel IDS variants using in vitro expression studies. Nineteen novel mutations were identified, in which the percentages of IDS activity of the novel missense mutations c.137A>C, c.311A>T, c.454A>C, c.797C>G, c.817C>T, c.998C>T, c.1106C>G, c.1400C>T, c.1402C>T, and c.1403G>A were significantly decreased (p < 0.001), c.254C>T and c.1025A>G were moderately decreased (p < 0.01), and c.851C>T was slightly decreased (p < 0.05) comparing with normal enzyme activity. The activities of the other six missense mutations were reduced but were insignificant. The results of genomic studies and their phenotypes were highly correlated. A greater understanding of the positive correlations may help to prevent the irreversible manifestations of Hunter syndrome, particularly in infants suspected of having asymptomatic MPS II. In addition, urinary glycosaminoglycan assay is important to diagnose Hunter syndrome since gene mutations are not definitive (could be non-pathogenic).
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Affiliation(s)
- Hsiang-Yu Lin
- Department of Medical Research, MacKay Memorial Hospital, New Taipei City 25160, Taiwan; (H.-Y.L.); (R.-Y.T.); (S.-R.C.); (S.F.); (F.-J.W.)
- Department of Pediatrics, MacKay Memorial Hospital, Taipei 10449, Taiwan
- MacKay Junior College of Medicine, Nursing and Management, New Taipei City 25245, Taiwan
- Department of Medicine, MacKay Medical College, New Taipei City 25245, Taiwan
- Department of Medical Research, China Medical University Hospital, China Medical University, Taichung 40402, Taiwan
- Rare Disease Center, MacKay Memorial Hospital, Taipei 10449, Taiwan; (Y.-T.L.); (S.-Y.T.); (Y.-H.C.)
| | - Ru-Yi Tu
- Department of Medical Research, MacKay Memorial Hospital, New Taipei City 25160, Taiwan; (H.-Y.L.); (R.-Y.T.); (S.-R.C.); (S.F.); (F.-J.W.)
| | - Schu-Rern Chern
- Department of Medical Research, MacKay Memorial Hospital, New Taipei City 25160, Taiwan; (H.-Y.L.); (R.-Y.T.); (S.-R.C.); (S.F.); (F.-J.W.)
| | - Yun-Ting Lo
- Rare Disease Center, MacKay Memorial Hospital, Taipei 10449, Taiwan; (Y.-T.L.); (S.-Y.T.); (Y.-H.C.)
| | - Sisca Fran
- Department of Medical Research, MacKay Memorial Hospital, New Taipei City 25160, Taiwan; (H.-Y.L.); (R.-Y.T.); (S.-R.C.); (S.F.); (F.-J.W.)
| | - Fang-Jie Wei
- Department of Medical Research, MacKay Memorial Hospital, New Taipei City 25160, Taiwan; (H.-Y.L.); (R.-Y.T.); (S.-R.C.); (S.F.); (F.-J.W.)
| | - Sung-Fa Huang
- Department of Laboratory Medicine, MacKay Memorial Hospital, New Taipei City 25160, Taiwan;
| | - Shin-Yu Tsai
- Rare Disease Center, MacKay Memorial Hospital, Taipei 10449, Taiwan; (Y.-T.L.); (S.-Y.T.); (Y.-H.C.)
| | - Ya-Hui Chang
- Rare Disease Center, MacKay Memorial Hospital, Taipei 10449, Taiwan; (Y.-T.L.); (S.-Y.T.); (Y.-H.C.)
| | - Chung-Lin Lee
- Department of Pediatrics, MacKay Memorial Hospital, Hsinchu 30071, Taiwan;
- Institute of Clinical Medicine, National Yang-Ming University, Taipei 11221, Taiwan
| | - Shuan-Pei Lin
- Department of Medical Research, MacKay Memorial Hospital, New Taipei City 25160, Taiwan; (H.-Y.L.); (R.-Y.T.); (S.-R.C.); (S.F.); (F.-J.W.)
- Department of Pediatrics, MacKay Memorial Hospital, Taipei 10449, Taiwan
- MacKay Junior College of Medicine, Nursing and Management, New Taipei City 25245, Taiwan
- Department of Medicine, MacKay Medical College, New Taipei City 25245, Taiwan
- Rare Disease Center, MacKay Memorial Hospital, Taipei 10449, Taiwan; (Y.-T.L.); (S.-Y.T.); (Y.-H.C.)
- Department of Infant and Child Care, National Taipei University of Nursing and Health Sciences, Taipei 11219, Taiwan
- Correspondence: (S.-P.L.); (C.-K.C.)
| | - Chih-Kuang Chuang
- Department of Medical Research, MacKay Memorial Hospital, New Taipei City 25160, Taiwan; (H.-Y.L.); (R.-Y.T.); (S.-R.C.); (S.F.); (F.-J.W.)
- College of Medicine, Fu-Jen Catholic University, New Taipei City 24205, Taiwan
- Correspondence: (S.-P.L.); (C.-K.C.)
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Genetic analysis of 63 Chinese patients with mucopolysaccharidosis type II: Functional characterization of seven novel IDS variants. Clin Chim Acta 2019; 491:114-120. [DOI: 10.1016/j.cca.2019.01.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Revised: 01/09/2019] [Accepted: 01/10/2019] [Indexed: 11/20/2022]
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Holmes RS. Comparative studies of vertebrate iduronate 2-sulfatase (IDS) genes and proteins: evolution of A mammalian X-linked gene. 3 Biotech 2017; 7:22. [PMID: 28401457 PMCID: PMC5388652 DOI: 10.1007/s13205-016-0595-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2016] [Accepted: 12/23/2016] [Indexed: 12/24/2022] Open
Abstract
IDS is responsible for the lysosomal degradation of heparan sulfate and dermatan sulfate and linked to an X-linked lysosomal storage disease, mucopolysaccharidosis 2 (MPS2), resulting in neurological damage and early death. Comparative IDS amino acid sequences and structures and IDS gene locations were examined using data from several vertebrate genome projects. Vertebrate IDS sequences shared 60–99% identities with each other. Human IDS showed 47% sequence identity with fruit fly (Drosophila melanogaster) IDS. Sequence alignments, key amino acid residues, N-glycosylation sites and conserved predicted secondary and tertiary structures were also studied, including signal peptide, propeptide and active site residues. Mammalian IDS genes usually contained 9 coding exons. The human IDS gene promoter contained a large CpG island (CpG46) and 5 transcription factor binding sites, whereas the 3′-UTR region contained 5 miRNA target sites. These may contribute to IDS gene regulation of expression in the brain and other neural tissues of the body. An IDS pseudogene (IDSP1) was located proximally to the IDS gene on the X-chromosome in primate genomes. Phylogenetic analyses examined the relationships and potential evolutionary origins of the vertebrate IDS gene. These suggested that IDS has originated in an invertebrate ancestral genome and retained throughout vertebrate evolution and conserved on marsupial and eutherian X-chromosomes, with the exception of rat Ids on chromosome 8.
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Chistiakov DA, Savost'anov KV, Kuzenkova LM, Gevorkyan AK, Pushkov AA, Nikitin AG, Pakhomov AV, Vashakmadze ND, Zhurkova NV, Podkletnova TV, Mayansky NA, Namazova-Baranova LS, Baranov AA. Molecular characteristics of patients with glycosaminoglycan storage disorders in Russia. Clin Chim Acta 2014; 436:112-20. [PMID: 24875751 DOI: 10.1016/j.cca.2014.05.010] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2014] [Revised: 05/16/2014] [Accepted: 05/18/2014] [Indexed: 02/09/2023]
Abstract
BACKGROUND The mucopolysaccharidoses (MPSs) are rare genetic disorders caused by mutations in lysosomal enzymes involved in the degradation of glycosaminoglycans (GAGs). In this study, we analyzed a total of 48 patients including MPSI (n=6), MPSII (n=18), MPSIIIA (n=11), MPSIVA (n=3), and MPSVI (n=10). METHODS In MPS patients, urinary GAGs were colorimetrically assayed. Enzyme activity was quantified by colorimetric and fluorimetric assays. To find mutations, all IDUA, IDS, SGSH, GALNS, and ARSB exons and intronic flanks were sequenced. New mutations were functionally assessed by reconstructing mutant alleles with site-directed mutagenesis followed with expression of wild-type and mutant genetic variants in CHO cells, measuring enzymatic activity, and Western blot analysis of protein expression of normal and mutated enzymes in cell lysates. RESULTS A total of five novel mutations were found including p.Asn348Lys (IDUA) in MPSI, p.Tyr240Cys (GALNS) in MPSIVA, and three ARSB mutations (p.Gln110*, p.Asn262Lysfs*14, and pArg315*) in MPSVI patients. In case of mutations p.Asn348Lys, p.Asn262Lysfs*14, and p.Gln110*, no mutant protein was detected while activity of the mutant protein was <1% of that of the normal enzyme. For p.Tyr240Cys, a trace of mutant protein was observed with a remnant activity of 3.6% of the wild-type GALNS activity. For pArg315*, a truncated 30-kDa protein that had 7.9% of activity of the normal ARSB was detected. CONCLUSIONS These data further enrich our knowledge of the genetic background of MPSs.
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Affiliation(s)
- Dimitry A Chistiakov
- Department of Medical Nanobiotechnology, Pirogov Russian State Medical University, 117997 Moscow, Russia; Department of Molecular Genetic Diagnostics, Division of Laboratory Medicine, Institute of Pediatrics, Research Center for Children's Health, 119991 Moscow, Russia.
| | - Kirill V Savost'anov
- Department of Molecular Genetic Diagnostics, Division of Laboratory Medicine, Institute of Pediatrics, Research Center for Children's Health, 119991 Moscow, Russia
| | - Lyudmila M Kuzenkova
- Department of Psychoneurology and Psychosomatic Pathology, Institute of Pediatrics, Research Center for Children's Health, 119991 Moscow, Russia
| | - Anait K Gevorkyan
- Institute of Preventive Pediatrics and Rehabilitation, Research Center for Children's Health, 119991 Moscow, Russia
| | - Alexander A Pushkov
- Department of Molecular Genetic Diagnostics, Division of Laboratory Medicine, Institute of Pediatrics, Research Center for Children's Health, 119991 Moscow, Russia
| | - Alexey G Nikitin
- Department of Molecular Genetic Diagnostics, Division of Laboratory Medicine, Institute of Pediatrics, Research Center for Children's Health, 119991 Moscow, Russia
| | - Alexander V Pakhomov
- Department of Molecular Genetic Diagnostics, Division of Laboratory Medicine, Institute of Pediatrics, Research Center for Children's Health, 119991 Moscow, Russia
| | - Nato D Vashakmadze
- Department of Psychoneurology and Psychosomatic Pathology, Institute of Pediatrics, Research Center for Children's Health, 119991 Moscow, Russia
| | - Natalia V Zhurkova
- Department of Molecular Genetic Diagnostics, Division of Laboratory Medicine, Institute of Pediatrics, Research Center for Children's Health, 119991 Moscow, Russia
| | - Tatiana V Podkletnova
- Department of Psychoneurology and Psychosomatic Pathology, Institute of Pediatrics, Research Center for Children's Health, 119991 Moscow, Russia
| | - Nikolai A Mayansky
- Department of Experimental Immunology and Virology, Division of Laboratory Medicine, Institute of Pediatrics, Research Center for Children's Health, 119991 Moscow, Russia
| | - Leila S Namazova-Baranova
- Institute of Preventive Pediatrics and Rehabilitation, Research Center for Children's Health, 119991 Moscow, Russia
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