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Niwa K, Toyoda H, Kohso A, Okumura Y, Kunishima S, Hirayama M. Case Report: MYH9-related disease caused by Ala44Pro mutation in a child with a previous diagnosis of chronic immune thrombocytopenia. Front Pediatr 2024; 12:1391742. [PMID: 38827217 PMCID: PMC11140069 DOI: 10.3389/fped.2024.1391742] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/26/2024] [Accepted: 04/25/2024] [Indexed: 06/04/2024] Open
Abstract
MYH9-related disease, a rare autosomal dominant platelet disorder characterized by thrombocytopenia, giant platelets, and leukocyte inclusion bodies, may mimic immune thrombocytopenia in children unless suspected and carefully excluded. Here, we present a case involving a three-year-old girl with mild bleeding symptoms since infancy, previously diagnosed with chronic immune thrombocytopenia. The patient exhibited isolated thrombocytopenia and lacked any family history of thrombocytopenia, hearing impairment, or renal failure. Examination of peripheral blood smears via light microscopy revealed significant platelet macrocytosis with giant platelets and basophilic Döhle-like bodies in the neutrophils. Subsequent sequencing analysis of MYH9 gene identified a p.Ala44Pro mutation. Throughout a six-year follow-up period, the patient's condition remained stable. Our report underscores the significance of identifying leukocyte inclusion bodies in peripheral blood smears and considering MYH9-related diseases, even in instances of chronic macrothrombocytopenia devoid of familial history or non-hematological manifestations.
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Affiliation(s)
- Kaori Niwa
- Department of Pediatrics, Mie University Graduate School of Medicine, Tsu, Japan
| | - Hidemi Toyoda
- Department of Pediatrics, Mie University Graduate School of Medicine, Tsu, Japan
| | - Atsushi Kohso
- Department of Pediatrics, Mie University Graduate School of Medicine, Tsu, Japan
| | - Yosuke Okumura
- Department of Pediatrics, Mie University Graduate School of Medicine, Tsu, Japan
| | - Shinji Kunishima
- Department of Medical Technology, Gifu University of Medical Science, Gifu, Japan
| | - Masahiro Hirayama
- Department of Pediatrics, Mie University Graduate School of Medicine, Tsu, Japan
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2
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Islam ST, Cheheltani S, Cheng C, Fowler VM. Disease-related non-muscle myosin IIA D1424N rod domain mutation, but not R702C motor domain mutation, disrupts mouse ocular lens fiber cell alignment and hexagonal packing. Cytoskeleton (Hoboken) 2024. [PMID: 38516850 DOI: 10.1002/cm.21853] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2024] [Revised: 02/28/2024] [Accepted: 03/01/2024] [Indexed: 03/23/2024]
Abstract
The mouse ocular lens is an excellent vertebrate model system for studying hexagonal cell packing and shape changes during tissue morphogenesis and differentiation. The lens is composed of two types of cells, epithelial and fiber cells. During the initiation of fiber cell differentiation, lens epithelial cells transform from randomly packed cells to hexagonally shaped and packed cells to form meridional row cells. The meridional row cells further differentiate and elongate into newly formed fiber cells that maintain hexagonal cell shape and ordered packing. In other tissues, actomyosin contractility regulates cell hexagonal packing geometry during epithelial tissue morphogenesis. Here, we use the mouse lens as a model to study the effect of two human disease-related non-muscle myosin IIA (NMIIA) mutations on lens cellular organization during fiber cell morphogenesis and differentiation. We studied genetic knock-in heterozygous mice with NMIIA-R702C motor domain or NMIIA-D1424N rod domain mutations. We observed that while one allele of NMIIA-R702C has no impact on lens meridional row epithelial cell shape and packing, one allele of the NMIIA-D1424N mutation can cause localized defects in cell hexagonal packing. Similarly, one allele of NMIIA-R702C motor domain mutation does not affect lens fiber cell organization while the NMIIA-D1424N mutant proteins disrupt fiber cell organization and packing. Our work demonstrates that disease-related NMIIA rod domain mutations (D1424N or E1841K) disrupt mouse lens fiber cell morphogenesis and differentiation.
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Affiliation(s)
- Sadia T Islam
- Department of Biological Sciences, University of Delaware, Newark, Delaware, USA
| | - Sepideh Cheheltani
- Department of Biological Sciences, University of Delaware, Newark, Delaware, USA
| | - Catherine Cheng
- School of Optometry and Vision Science Program, Indiana University, Bloomington, Indiana, USA
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, California, USA
| | - Velia M Fowler
- Department of Biological Sciences, University of Delaware, Newark, Delaware, USA
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, California, USA
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3
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Miyoshi T, Belyantseva IA, Sajeevadathan M, Friedman TB. Pathophysiology of human hearing loss associated with variants in myosins. Front Physiol 2024; 15:1374901. [PMID: 38562617 PMCID: PMC10982375 DOI: 10.3389/fphys.2024.1374901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2024] [Accepted: 02/21/2024] [Indexed: 04/04/2024] Open
Abstract
Deleterious variants of more than one hundred genes are associated with hearing loss including MYO3A, MYO6, MYO7A and MYO15A and two conventional myosins MYH9 and MYH14. Variants of MYO7A also manifest as Usher syndrome associated with dysfunction of the retina and vestibule as well as hearing loss. While the functions of MYH9 and MYH14 in the inner ear are debated, MYO3A, MYO6, MYO7A and MYO15A are expressed in inner ear hair cells along with class-I myosin MYO1C and are essential for developing and maintaining functional stereocilia on the apical surface of hair cells. Stereocilia are large, cylindrical, actin-rich protrusions functioning as biological mechanosensors to detect sound, acceleration and posture. The rigidity of stereocilia is sustained by highly crosslinked unidirectionally-oriented F-actin, which also provides a scaffold for various proteins including unconventional myosins and their cargo. Typical myosin molecules consist of an ATPase head motor domain to transmit forces to F-actin, a neck containing IQ-motifs that bind regulatory light chains and a tail region with motifs recognizing partners. Instead of long coiled-coil domains characterizing conventional myosins, the tails of unconventional myosins have various motifs to anchor or transport proteins and phospholipids along the F-actin core of a stereocilium. For these myosins, decades of studies have elucidated their biochemical properties, interacting partners in hair cells and variants associated with hearing loss. However, less is known about how myosins traffic in a stereocilium using their motor function, and how each variant correlates with a clinical condition including the severity and onset of hearing loss, mode of inheritance and presence of symptoms other than hearing loss. Here, we cover the domain structures and functions of myosins associated with hearing loss together with advances, open questions about trafficking of myosins in stereocilia and correlations between hundreds of variants in myosins annotated in ClinVar and the corresponding deafness phenotypes.
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Affiliation(s)
- Takushi Miyoshi
- Laboratory of Molecular Genetics, National Institute on Deafness and Other Communication Disorders, National Institutes of Health, Bethesda, MD, United States
- Division of Molecular and Integrative Physiology, Department of Biomedical Sciences, Southern Illinois University School of Medicine, Carbondale, IL, United States
| | - Inna A. Belyantseva
- Laboratory of Molecular Genetics, National Institute on Deafness and Other Communication Disorders, National Institutes of Health, Bethesda, MD, United States
| | - Mrudhula Sajeevadathan
- Division of Molecular and Integrative Physiology, Department of Biomedical Sciences, Southern Illinois University School of Medicine, Carbondale, IL, United States
| | - Thomas B. Friedman
- Laboratory of Molecular Genetics, National Institute on Deafness and Other Communication Disorders, National Institutes of Health, Bethesda, MD, United States
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4
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García-Vielma C, Lazalde-Córdova LG, Arzola-Hernández JC, González-Aceves EN, López-Zertuche H, Guzmán-Delgado NE, González-Salazar F. Identification of variants in genes associated with hypertrophic cardiomyopathy in Mexican patients. Mol Genet Genomics 2023; 298:1289-1299. [PMID: 37498360 PMCID: PMC10657276 DOI: 10.1007/s00438-023-02048-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Accepted: 06/22/2023] [Indexed: 07/28/2023]
Abstract
The objective of this work was to identify genetic variants in Mexican patients diagnosed with hypertrophic cardiomyopathy (HCM). According to world literature, the genes mainly involved are MHY7 and MYBPC3, although variants have been found in more than 50 genes related to heart disease and sudden death, and to our knowledge there are no studies in the Mexican population. These variants are reported and classified in the ClinVar (PubMed) database and only some of them are recognized in the Online Mendelian Information in Men (OMIM). The present study included 37 patients, with 14 sporadic cases and 6 familial cases, with a total of 21 index cases. Next-generation sequencing was performed on a predesigned panel of 168 genes associated with heart disease and sudden death. The sequencing analysis revealed twelve (57%) pathogenic or probably pathogenic variants, 9 of them were familial cases, managing to identify pathogenic variants in relatives without symptoms of the disease. At the molecular level, nine of the 12 variants (75%) were single nucleotide changes, 2 (17%) deletions, and 1 (8%) splice site alteration. The genes involved were MYH7 (25%), MYBPC3 (25%) and ACADVL, KCNE1, TNNI3, TPM1, SLC22A5, TNNT2 (8%). In conclusion; we found five variants that were not previously reported in public databases. It is important to follow up on the reclassification of variants, especially those of uncertain significance in patients with symptoms of the condition. All patients included in the study and their relatives received family genetic counseling.
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Affiliation(s)
- Catalina García-Vielma
- Centro de Investigación Biomédica del Noreste, Departamento de Citogenética, Instituto Mexicano del Seguro Social, Monterrey, NL, México.
| | - Luis Gerardo Lazalde-Córdova
- Centro de Investigación Biomédica del Noreste, Departamento de Citogenética, Instituto Mexicano del Seguro Social, Monterrey, NL, México
| | - José Cruz Arzola-Hernández
- Departamento de Electrofisiología, Instituto Mexicano del Seguro Social, Unidad Médica de Alta Especialidad. Hospital de cardiología No. 34 "Dr. Alfonso J. Treviño Treviño" del Centro Médico Nacional del Noreste, Monterrey, NL, México
| | - Erick Noel González-Aceves
- Departamento de Electrofisiología, Instituto Mexicano del Seguro Social, Unidad Médica de Alta Especialidad. Hospital de cardiología No. 34 "Dr. Alfonso J. Treviño Treviño" del Centro Médico Nacional del Noreste, Monterrey, NL, México
| | | | - Nancy Elena Guzmán-Delgado
- Departamento de Electrofisiología, Instituto Mexicano del Seguro Social, Unidad Médica de Alta Especialidad. Hospital de cardiología No. 34 "Dr. Alfonso J. Treviño Treviño" del Centro Médico Nacional del Noreste, Monterrey, NL, México.
| | - Francisco González-Salazar
- Centro de Investigación Biomédica del Noreste, Departamento de Citogenética, Instituto Mexicano del Seguro Social, Monterrey, NL, México
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5
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Li X, Wang W, Ni X, Cheng D, Chen J. Successful living-related kidney transplantation in MYH9-related disorder with macrothrombocytopenia: lessons for the clinical nephrologist. J Nephrol 2023:10.1007/s40620-023-01651-7. [PMID: 37258992 DOI: 10.1007/s40620-023-01651-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2023] [Accepted: 04/15/2023] [Indexed: 06/02/2023]
Affiliation(s)
- Xue Li
- National Clinical Research Center for Kidney Diseases, Jinling Hospital, Medical School of Nanjing University, Nanjing, China
| | - Wei Wang
- Department of Nephrology, Shanghai Tenth People's Hospital, Shanghai, China
| | - Xuefeng Ni
- National Clinical Research Center for Kidney Diseases, Jinling Hospital, Medical School of Nanjing University, Nanjing, China
| | - Dongrui Cheng
- National Clinical Research Center for Kidney Diseases, Jinling Hospital, Medical School of Nanjing University, Nanjing, China.
| | - Jinsong Chen
- National Clinical Research Center for Kidney Diseases, Jinling Hospital, Medical School of Nanjing University, Nanjing, China.
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6
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Islam ST, Cheng C, Parreno J, Fowler VM. Nonmuscle Myosin IIA Regulates the Precise Alignment of Hexagonal Eye Lens Epithelial Cells During Fiber Cell Formation and Differentiation. Invest Ophthalmol Vis Sci 2023; 64:20. [PMID: 37070941 PMCID: PMC10123325 DOI: 10.1167/iovs.64.4.20] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Accepted: 03/27/2023] [Indexed: 04/19/2023] Open
Abstract
Purpose Epithelial cells in the equatorial region of the ocular lens undergo a remarkable transition from randomly packed cells into precisely aligned and hexagon-shaped cells organized into meridional rows. We investigated the function of nonmuscle myosin IIA (encoded by Myh9) in regulating equatorial epithelial cell alignment to form meridional rows during secondary fiber cell morphogenesis. Methods We used genetic knock-in mice to study a common human Myh9 mutation, E1841K, in the rod domain. The E1841K mutation disrupts bipolar filament assembly. Lens shape, clarity, and stiffness were evaluated, and Western blots were used to determine the level of normal and mutant myosins. Cryosections and lens whole mounts were stained and imaged by confocal microscopy to investigate cell shape and organization. Results We observed no obvious changes in lens size, shape, and biomechanical properties (stiffness and resilience) between the control and nonmuscle myosin IIA-E1841K mutant mice at 2 months of age. Surprisingly, we found misalignment and disorder of fiber cells in heterozygous and homozygous mutant lenses. Further analysis revealed misshapen equatorial epithelial cells that cause disorientation of the meridional rows before fiber cell differentiation in homozygous mutant lenses. Conclusions Our data indicate that nonmuscle myosin IIA bipolar filament assembly is required for the precise alignment of the meridional rows at the lens equator and that the organization of lens fiber cells depends on the proper patterning of meridional row epithelial cells. These data also suggest that lens fiber cell organization and a hexagonal shape are not required for normal lens size, shape transparency, or biomechanical properties.
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Affiliation(s)
- Sadia T. Islam
- Department of Biological Sciences, University of Delaware, Newark, Delaware, United States
| | - Catherine Cheng
- School of Optometry and Vision Science Program, Indiana University, Bloomington, Indiana, United States
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, California, United States
| | - Justin Parreno
- Department of Biological Sciences, University of Delaware, Newark, Delaware, United States
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, California, United States
| | - Velia M. Fowler
- Department of Biological Sciences, University of Delaware, Newark, Delaware, United States
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, California, United States
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7
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Li J, Rong L, Wang J, Fang Y. Umbilical cord blood transplantation for MYH9-related disorders. Pediatr Blood Cancer 2022; 69:e29711. [PMID: 35441449 DOI: 10.1002/pbc.29711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Accepted: 03/23/2022] [Indexed: 11/07/2022]
Affiliation(s)
- Jian Li
- Department of Hematology and Oncology, Children's Hospital of Nanjing Medical University, Nanjing, China
- Key Laboratory of Hematology, Nanjing Medical University Nanjing, Nanjing, China
| | - Liucheng Rong
- Department of Hematology and Oncology, Children's Hospital of Nanjing Medical University, Nanjing, China
- Key Laboratory of Hematology, Nanjing Medical University Nanjing, Nanjing, China
| | - Jun Wang
- Department of Hematology and Oncology, Children's Hospital of Nanjing Medical University, Nanjing, China
- Key Laboratory of Hematology, Nanjing Medical University Nanjing, Nanjing, China
| | - Yongjun Fang
- Department of Hematology and Oncology, Children's Hospital of Nanjing Medical University, Nanjing, China
- Key Laboratory of Hematology, Nanjing Medical University Nanjing, Nanjing, China
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8
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Arif AR, Zhao M, Chen W, Xue M, Luo S, Wang Y. Avatrombopag improves thrombocytopenia in MYH9-related disorder following eltrombopag treatment failure. Platelets 2022; 33:1307-1311. [PMID: 35791514 DOI: 10.1080/09537104.2022.2096211] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
MYH9-related disorder (MYH9-RD) is autosomal dominant thrombocytopenia caused by mutations in the MYH9 gene, which codes for the non-muscle myosin-IIA heavy chain. We present a case of a 24-year-old Chinese man with MYH9-RD who was initially misdiagnosed with immune thrombocytopenia. Whole-exome sequencing and Sanger sequencing revealed a novel missense mutation in the MYH9 gene at the position of c.4550 G > T (p.G1517V) in exon 32. The same phenotype was observed in the proband, his mother, and his brother, in addition to macrothrombocytopenia and Dohle-like bodies in neutrophil granulocytes without non-hematologic manifestations. Following failed treatment with eltrombopag, avatrombopag, which was not mentioned before in the MYH9-RD treatment, was administered to the patient, and thrombocytopenia improved. In this case report, we present a novel pathogenic mutation and show the potential of avatrombopag for temporarily increasing the platelet count in patients with MYH9-RD.
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Affiliation(s)
- Abdul Rehman Arif
- School of International Education, Jianghan University, Wuhan, P.R. China
| | - Miaomiao Zhao
- Institute of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P.R. China
| | - Wenlan Chen
- Institute of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P.R. China
| | - Mei Xue
- Institute of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P.R. China
| | - Shanshan Luo
- Institute of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P.R. China
| | - Yadan Wang
- Institute of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P.R. China
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Pezeshkpoor B, Oldenburg J, Pavlova A. Experiences in Routine Genetic Analysis of Hereditary Hemorrhagic, Thrombotic, and Platelet Disorders. Hamostaseologie 2022; 42:S5-S12. [PMID: 35226963 DOI: 10.1055/a-1726-4793] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
Abstract
Hemostasis is a complex and tightly regulated system that attempts to maintain a homeostatic balance to permit normal blood flow, without bleeding or thrombosis. Hemostasis reflects the subtle balance between procoagulant and anticoagulant factors in the pathways of primary hemostasis, secondary hemostasis, and fibrinolysis. The major components in this interplay include the vascular endothelium, platelets, coagulation factors, and fibrinolytic factors. After vessel wall injury, the subendothelium is exposed to the blood stream, followed by rapid activation of platelets via collagen binding and von Willebrand factor-mediated platelet adhesion to the damaged vessel wall through platelet glycoprotein receptor Ib/IX/V. Activated platelets change their shape, release bioactive molecules from their granules, and expose negatively charged phospholipids on their surface. For a proper function of this process, an adequate number of functional platelets are required. Subsequently, a rapid generation of sufficient amounts of thrombin begins; followed by activation of the coagulation system and its coagulation factors (secondary hemostasis), generating fibrin that consolidates the platelet plug. To maintain equilibrium between coagulation and anticoagulation, the naturally occurring anticoagulants such as protein C, protein S, and antithrombin keep this process in balance. Deficiencies (inherited or acquired) at any level of this fine-tuned system result in pathologic bleedings or increased hypercoagulability states leading to thrombosis. This review will focus on genetic diagnosis of inherited bleeding, thrombotic, and platelet disorders, discussing strengths and limitations of existing diagnostic settings and genetic tools and highlight some important considerations necessary for clinical application.
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Affiliation(s)
- B Pezeshkpoor
- Institute of Experimental Hematology and Transfusion Medicine, University Hospital Bonn, Medical Faculty, University of Bonn, Bonn, Germany.,Center for Rare Diseases Bonn (ZSEB), University Clinic Bonn, Bonn, Germany
| | - J Oldenburg
- Institute of Experimental Hematology and Transfusion Medicine, University Hospital Bonn, Medical Faculty, University of Bonn, Bonn, Germany.,Center for Rare Diseases Bonn (ZSEB), University Clinic Bonn, Bonn, Germany
| | - A Pavlova
- Institute of Experimental Hematology and Transfusion Medicine, University Hospital Bonn, Medical Faculty, University of Bonn, Bonn, Germany.,Center for Rare Diseases Bonn (ZSEB), University Clinic Bonn, Bonn, Germany
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10
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Wong L, Huang LL, Nedeljkovic M, Irish A, McMahon LP. Nephritis and Hearing Loss-Not All Roads Lead to Alport Syndrome. Kidney Int Rep 2021; 6:2922-2925. [PMID: 34805643 PMCID: PMC8589699 DOI: 10.1016/j.ekir.2021.08.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Revised: 07/25/2021] [Accepted: 08/02/2021] [Indexed: 11/16/2022] Open
Affiliation(s)
- Limy Wong
- Department of Renal Medicine, Eastern Health, Box Hill, Australia.,Department of Renal Medicine, Monash University Eastern Health Clinical School, Box Hill, Australia
| | - Louis L Huang
- Department of Renal Medicine, Eastern Health, Box Hill, Australia.,Department of Renal Medicine, Monash University Eastern Health Clinical School, Box Hill, Australia
| | - Marija Nedeljkovic
- Department of Renal Medicine, Monash University Eastern Health Clinical School, Box Hill, Australia.,Department of Haematology, Eastern Health, Box Hill, Australia
| | - Ashley Irish
- Department of Nephrology, Fiona Stanley Hospital, Murdoch, Australia
| | - Lawrence P McMahon
- Department of Renal Medicine, Eastern Health, Box Hill, Australia.,Department of Renal Medicine, Monash University Eastern Health Clinical School, Box Hill, Australia
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Pan C, Zhang Y, Yang S, Chen C, Wang J, Shi C, Yu Y. A novel MYH9 mutation related to non-syndromic delayed post-lingual sensorineural hearing loss. Eur Arch Otorhinolaryngol 2021; 279:2811-2817. [PMID: 34228168 DOI: 10.1007/s00405-021-06976-2] [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: 05/01/2021] [Accepted: 06/29/2021] [Indexed: 11/29/2022]
Abstract
OBJECTIVE Hearing loss (HL) is the most common sensory organ dysfunction disease. The cause is often complex, though genetics are the main factor. METHODS In this study, we investigated a Chinese family with non-syndromic delayed post-lingual deafness. Comprehensive data collection was performed on this family's members, including basic information, audiological examinations, blood system examinations and imaging examinations. A pedigree diagram was drawn and the genetic patterns were analyzed. RESULTS A new gene mutation, c.314A>T:p.Y105F in the MYH9 exon, was confirmed by next generation sequencing and Sanger sequencing. This mutation co-segregated with the phenotype in the pedigree. Patients in this family present bilateral symmetry and gradual and delayed high-frequency sensorineural hearing loss. The age of onset was approximately 30 years old. Except for hearing loss, no lesions were seen in other organs, especially the blood system. CONCLUSION The identification and detection of a novel MYH9 mutation may be of great significance to provide the basis for gene function research and genetic consultation.
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Affiliation(s)
- Chen Pan
- Department of Otolaryngology, The First Affiliated Hospital of Soochow University, Suzhou, China
| | - Yunmei Zhang
- Department of Otolaryngology, The First Affiliated Hospital of Soochow University, Suzhou, China
| | - Siqi Yang
- Department of Otolaryngology, The First Affiliated Hospital of Soochow University, Suzhou, China
| | - Chun Chen
- Department of Otolaryngology, The First Affiliated Hospital of Soochow University, Suzhou, China
| | - Jinxin Wang
- Department of Otolaryngology, The First Affiliated Hospital of Soochow University, Suzhou, China
| | - Chen Shi
- Department of Otolaryngology, The First Affiliated Hospital of Soochow University, Suzhou, China
| | - Yafeng Yu
- Department of Otolaryngology, The First Affiliated Hospital of Soochow University, Suzhou, China.
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12
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Natesirinilkul R, Sosothikul D, Komwilaisak P, Pongtanakul B, Narkbunnum N, Yudhasompop N, Mekjarusgool P, Niparuck P, Boonyawat K, Kunishima S, Sirachainan N. MYH9 disorder: Identification and a novel mutation in patients with macrothrombocytopenia. Pediatr Blood Cancer 2021; 68:e29055. [PMID: 33855781 DOI: 10.1002/pbc.29055] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Revised: 02/25/2021] [Accepted: 03/25/2021] [Indexed: 11/10/2022]
Abstract
The diagnosis of MYH9 disorder is guided by recognizing granulocyte Döhle body-like inclusion bodies and large/giant platelets in the peripheral blood smear. Immunofluorescence study of nonmuscle myosin heavy chain IIA is a sensitive screening method for diagnosis of MYH9 disorder. The diagnosis can then be confirmed by genetic analysis. A total of 67 patients with macrothrombocytopenia were included, of which 11 patients (16%), aged 4 months to 22 years, were ultimately diagnosed with MYH9 disorder. One novel mutation in exon 30 at c.4338T>C (p.F1446A) was detected. This mutation was associated with nonhematologic manifestations presenting in late adolescence with cataracts, hearing loss, and hematuria.
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Affiliation(s)
| | | | | | - Bunchoo Pongtanakul
- Faculty of Medicine, Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | - Nattee Narkbunnum
- Faculty of Medicine, Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | | | | | - Pimjai Niparuck
- Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok, Thailand
| | - Kochawan Boonyawat
- Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok, Thailand
| | - Shinji Kunishima
- Department of Medical Technology, Gifu University of Medical Science, Gifu, Japan
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- Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand
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13
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Lian X, Wang Y, Gao J, Liu H, Hao J, Kunishima S. Novel variant of MYH9 associated with mild evaluation of MYH9 related disorder in a Chinese family. Clin Chem Lab Med 2021; 59:e398-e400. [PMID: 34013674 DOI: 10.1515/cclm-2021-0205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Accepted: 05/04/2021] [Indexed: 11/15/2022]
Affiliation(s)
- Xiaoqiang Lian
- Department of Clinical Laboratory, The Second Hospital of Hebei Medical University, Shijiazhuang, P.R. China
| | - Yuxin Wang
- Department of Laboratory Medicine, College of Medical Technology, Hebei Medical University, Shijiazhuang, P.R. China
| | - Jie Gao
- Department of Laboratory Medicine, College of Medical Technology, Hebei Medical University, Shijiazhuang, P.R. China
| | - Heqiong Liu
- Department of Laboratory Medicine, College of Medical Technology, Hebei Medical University, Shijiazhuang, P.R. China
| | - Jihong Hao
- Department of Medical Technology, Gifu University of Medical Science, Gifu, Japan
| | - Shinji Kunishima
- Department of Clinical Laboratory, The Second Hospital of Hebei Medical University, Shijiazhuang, P.R. China
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14
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Sung DC, Ahmad M, Lerma Cervantes CB, Zhang Y, Adelstein RS, Ma X. Mutations in non-muscle myosin 2A disrupt the actomyosin cytoskeleton in Sertoli cells and cause male infertility. Dev Biol 2020; 470:49-61. [PMID: 33188738 DOI: 10.1016/j.ydbio.2020.11.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Revised: 11/04/2020] [Accepted: 11/06/2020] [Indexed: 10/23/2022]
Abstract
Mutations in non-muscle myosin 2A (NM2A) encompass a wide spectrum of anomalies collectively known as MYH9-Related Disease (MYH9-RD) in humans that can include macrothrombocytopenia, glomerulosclerosis, deafness, and cataracts. We previously created mouse models of the three mutations most frequently found in humans: R702C, D1424N, and E1841K. While homozygous R702C and D1424N mutations are embryonic lethal, we found homozygous mutant E1841K mice to be viable. However the homozygous male, but not female, mice were infertile. Here, we report that these mice have reduced testis size and defects in actin-associated junctions in Sertoli cells, resulting in inability to form the blood-testis barrier and premature germ cell loss. Moreover, compound double heterozygous (R702C/E1841K and D1424/E1841K) males show the same abnormalities in testes as E1841K homozygous males. Conditional ablation of either NM2A or NM2B alone in Sertoli cells has no effect on fertility and testis size, however deletion of both NM2A and NM2B in Sertoli cells results in infertility. Isolation of mutant E1841K Sertoli cells reveals decreased NM2A and F-actin colocalization and thicker NM2A filaments. Furthermore, AE1841K/AE1841K and double knockout Sertoli cells demonstrate microtubule disorganization and increased tubulin acetylation, suggesting defects in the microtubule cytoskeleton. Together, these results demonstrate that NM2A and 2B paralogs play redundant roles in Sertoli cells and are essential for testes development and normal fertility.
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Affiliation(s)
- Derek C Sung
- Laboratory of Molecular Cardiology, Cell and Developmental Biology Center, Bethesda, MD, 20892-1583, United States; National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, 20892-1583, United States
| | - Mohsin Ahmad
- Laboratory of Molecular Cardiology, Cell and Developmental Biology Center, Bethesda, MD, 20892-1583, United States; National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, 20892-1583, United States
| | - Connie B Lerma Cervantes
- Laboratory of Molecular Cardiology, Cell and Developmental Biology Center, Bethesda, MD, 20892-1583, United States; National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, 20892-1583, United States
| | - Yingfan Zhang
- Laboratory of Molecular Cardiology, Cell and Developmental Biology Center, Bethesda, MD, 20892-1583, United States; National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, 20892-1583, United States
| | - Robert S Adelstein
- Laboratory of Molecular Cardiology, Cell and Developmental Biology Center, Bethesda, MD, 20892-1583, United States; National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, 20892-1583, United States
| | - Xuefei Ma
- Laboratory of Molecular Cardiology, Cell and Developmental Biology Center, Bethesda, MD, 20892-1583, United States; National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, 20892-1583, United States.
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15
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Guéguen P, Dupuis A, Py JY, Desprès A, Masson E, Le Marechal C, Cooper DN, Gachet C, Chen JM, Férec C. Pathogenic and likely pathogenic variants in at least five genes account for approximately 3% of mild isolated nonsyndromic thrombocytopenia. Transfusion 2020; 60:2419-2431. [PMID: 32757236 DOI: 10.1111/trf.15992] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2019] [Revised: 06/12/2020] [Accepted: 06/15/2020] [Indexed: 12/12/2022]
Abstract
BACKGROUND Thrombocytopenia has a variety of different etiologies, both acquired and hereditary. Inherited thrombocytopenia may be associated with other symptoms (syndromic forms) or may be strictly isolated. To date, only about half of all the familial forms of thrombocytopenia have been accounted for in terms of well-defined genetic abnormalities. However, data are limited on the nature and frequency of the underlying causative genetic variants in individuals with mild isolated nonsyndromic thrombocytopenia. STUDY DESIGN AND METHODS Thirteen known or candidate genes for isolated thrombocytopenia were included in a gene panel analysis in which targeted next-generation sequencing was performed on 448 French blood donors with mild isolated nonsyndromic thrombocytopenia. RESULTS A total of 68 rare variants, including missense, splice site, frameshift, nonsense, and in-frame variants (all heterozygous) were identified in 11 of the 13 genes screened. Twenty-nine percent (N = 20) of the variants detected were absent from both the French Exome Project and gnomAD exome databases. Using stringent criteria and an unbiased approach, we classified seven predicted loss-of-function variants (three in ITGA2B and four in TUBB1) and four missense variants (one in GP1BA, two in ITGB3 and one in ACTN1) as being pathogenic or likely pathogenic. Altogether, they were found in 13 members (approx. 3%) of our studied cohort. CONCLUSION We present the results of gene panel sequencing of known and candidate thrombocytopenia genes in mild isolated nonsyndromic thrombocytopenia. Pathogenic and likely pathogenic variants in five known thrombocytopenia genes were identified, accounting for approximately 3% of individuals with the condition.
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Affiliation(s)
- Paul Guéguen
- CHRU Brest, Brest, France.,EFS, Univ Brest, Inserm, UMR 1078, GGB, Brest, France
| | - Arnaud Dupuis
- Université de Strasbourg, Institut National de la Santé et de la Recherche Médicale, Etablissement Français du Sang Grand Est, Unité Mixte de Recherche-S 1255, Fédération de Médecine Translationnelle de Strasbourg, Strasbourg, France
| | - Jean-Yves Py
- EFS Centre-Pays de la Loire, Site d'Orléans, Orléans, France
| | | | - Emmanuelle Masson
- CHRU Brest, Brest, France.,EFS, Univ Brest, Inserm, UMR 1078, GGB, Brest, France
| | - Cédric Le Marechal
- CHRU Brest, Brest, France.,EFS, Univ Brest, Inserm, UMR 1078, GGB, Brest, France
| | - David N Cooper
- Institute of Medical Genetics, School of Medicine, Cardiff University, Cardiff, UK
| | - Christian Gachet
- Université de Strasbourg, Institut National de la Santé et de la Recherche Médicale, Etablissement Français du Sang Grand Est, Unité Mixte de Recherche-S 1255, Fédération de Médecine Translationnelle de Strasbourg, Strasbourg, France
| | | | - Claude Férec
- CHRU Brest, Brest, France.,EFS, Univ Brest, Inserm, UMR 1078, GGB, Brest, France
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16
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Wakefield BJ, Diehl R, Neff AT, Bakdash S, Pettersson GB, Mehta AR. Perioperative Management of a Patient With Profound Thrombocytopenia Secondary to MYH9-RD Presenting for Thoracic Aortic Aneurysm Repair and Aortic Valve Replacement. J Cardiothorac Vasc Anesth 2020; 35:1154-1160. [PMID: 32861542 DOI: 10.1053/j.jvca.2020.07.076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/30/2020] [Revised: 07/26/2020] [Accepted: 07/27/2020] [Indexed: 11/11/2022]
Affiliation(s)
- Brett J Wakefield
- Department of Cardiothoracic Anesthesiology, Anesthesiology Institute, Cleveland Clinic, Cleveland, OH.
| | - Rachel Diehl
- Department of Cardiothoracic Anesthesiology, Anesthesiology Institute, Cleveland Clinic, Cleveland, OH
| | - Anne T Neff
- Department of Hematology and Oncology, Taussig Cancer Institute, Cleveland Clinic, Cleveland, OH
| | - Suzanne Bakdash
- Department of Laboratory Medicine, Section of Transfusion Medicine, Pathology and Laboratory Medicine Institute, Cleveland Clinic, Cleveland, OH
| | - Gosta B Pettersson
- Department of Thoracic and Cardiovascular Surgery, Heart and Vascular Institute, Cleveland Clinic, Cleveland, OH
| | - Anand R Mehta
- Department of Cardiothoracic Anesthesiology, Anesthesiology Institute, Cleveland Clinic, Cleveland, OH
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17
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Huang YC, Shih YH, Lin CY, Chiu PF, Kuo SF, Lin JS, Shen MC. A family with an MYH9-related disorder with different phenotypes masquerading as immune thrombocytopaenia: an underreported disorder in Taiwan. Int J Hematol 2020; 112:878-882. [PMID: 32712863 DOI: 10.1007/s12185-020-02947-1] [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: 04/08/2020] [Revised: 07/03/2020] [Accepted: 07/14/2020] [Indexed: 11/30/2022]
Abstract
A 66-year-old woman had experienced abnormal bleeding since the age of 7. Thrombocytopenia was not detected until she was 48, and immune thrombocytopenia was diagnosed at age 66. She also reported experiencing hearing disturbance since the age of 30 and acute renal failure since the age of 61 but reported no visual disturbance. Her younger son, who was 40 years old, also experienced abnormal bleeding since the age of 6, but immune thrombocytopenia was diagnosed as late as age 35. He had no other associated disorders. Laboratory examinations of both mother and son revealed a low platelet count (8000 and 29,000 µL, respectively), giant platelets and Döhle body-like granulocyte inclusion bodies. The mother had a high creatinine level (15.4 mg/dL) and normal liver enzyme levels. MYH9 genetic analysis identified a heterozygous mutation, c.101T>A, p.Val34Glu at exon 2 in both patients. These clinical and laboratory findings were consistent with a diagnosis of an MYH9-related disorder with different phenotypes observed in the same family. MYH9-related disorders were recognised in 2003, but were often misdiagnosed as immune thrombocytopenia, and hence, they have rarely been reported in Taiwan.
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Affiliation(s)
- Ying-Chih Huang
- Department of Research, Changhua Christian Hospital, No. 135, Nanxiao Street, Changhua City, Taiwan
| | - Yu-Hung Shih
- Department of Internal Medicine, Changhua Christian Hospital, Changhua City, Taiwan
| | - Ching-Yeh Lin
- Department of Internal Medicine, Changhua Christian Hospital, Changhua City, Taiwan
| | - Ping-Fang Chiu
- Department of Internal Medicine, Changhua Christian Hospital, Changhua City, Taiwan
| | - Su-Feng Kuo
- Department of Laboratory Medicine, Changhua Christian Hospital, Changhua City, Taiwan
| | - Jen-Shiou Lin
- Department of Laboratory Medicine, Changhua Christian Hospital, Changhua City, Taiwan
| | - Ming-Ching Shen
- Department of Internal Medicine, Changhua Christian Hospital, Changhua City, Taiwan. .,Department of Laboratory Medicine, National Taiwan University Hospital, Taipei, Taiwan.
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18
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Non-Muscle Myosin 2A (NM2A): Structure, Regulation and Function. Cells 2020; 9:cells9071590. [PMID: 32630196 PMCID: PMC7408548 DOI: 10.3390/cells9071590] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Revised: 06/25/2020] [Accepted: 06/29/2020] [Indexed: 12/30/2022] Open
Abstract
Non-muscle myosin 2A (NM2A) is a motor cytoskeletal enzyme with crucial importance from the early stages of development until adulthood. Due to its capacity to convert chemical energy into force, NM2A powers the contraction of the actomyosin cytoskeleton, required for proper cell division, adhesion and migration, among other cellular functions. Although NM2A has been extensively studied, new findings revealed that a lot remains to be discovered concerning its spatiotemporal regulation in the intracellular environment. In recent years, new functions were attributed to NM2A and its activity was associated to a plethora of illnesses, including neurological disorders and infectious diseases. Here, we provide a concise overview on the current knowledge regarding the structure, the function and the regulation of NM2A. In addition, we recapitulate NM2A-associated diseases and discuss its potential as a therapeutic target.
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19
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Karki NR, Ajebo G, Savage N, Kutlar A. DIAPH1 Mutation as a Novel Cause of Autosomal Dominant Macrothrombocytopenia and Hearing Loss. Acta Haematol 2020; 144:91-94. [PMID: 32594080 DOI: 10.1159/000506727] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Accepted: 02/22/2020] [Indexed: 12/18/2022]
Abstract
Macrothrombocytopenia (MTP) is a group of rare disorders characterized by giant platelets, thrombocytopenia, and variable association with abnormal bleeding. Inherited MTP are frequently misdiagnosed as immune thrombocytopenia. Associated second-organ manifestation can help narrow down syndromic MTPs. We describe a case of autosomal dominant sensorineural hearing loss and MTP caused by a gain of function mutation in DIAPH1. This mutation causes altered megarkaryopoiesis and platelet cytoskeletal deregulation. Although hearing loss and MTP were likely progressive, clinically significant bleeding was not observed. DIAPH1-related MTP can be distinguished clinically from MYH9 mutation by the absence of cataracts and glomerular disease.
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Affiliation(s)
- Nabin Raj Karki
- Division of Hematology/Oncology, Georgia Cancer Center, Augusta University, Augusta, Georgia, USA,
| | - Germame Ajebo
- Division of Hematology/Oncology, Georgia Cancer Center, Augusta University, Augusta, Georgia, USA
| | - Natasha Savage
- Department of Pathology, Augusta University, Augusta, Georgia, USA
| | - Abdullah Kutlar
- Division of Hematology/Oncology, Georgia Cancer Center, Augusta University, Augusta, Georgia, USA
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20
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Asensio-Juárez G, Llorente-González C, Vicente-Manzanares M. Linking the Landscape of MYH9-Related Diseases to the Molecular Mechanisms that Control Non-Muscle Myosin II-A Function in Cells. Cells 2020; 9:E1458. [PMID: 32545517 PMCID: PMC7348894 DOI: 10.3390/cells9061458] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Revised: 06/09/2020] [Accepted: 06/10/2020] [Indexed: 12/13/2022] Open
Abstract
The MYH9 gene encodes the heavy chain (MHCII) of non-muscle myosin II A (NMII-A). This is an actin-binding molecular motor essential for development that participates in many crucial cellular processes such as adhesion, cell migration, cytokinesis and polarization, maintenance of cell shape and signal transduction. Several types of mutations in the MYH9 gene cause an array of autosomal dominant disorders, globally known as MYH9-related diseases (MYH9-RD). These include May-Hegglin anomaly (MHA), Epstein syndrome (EPS), Fechtner syndrome (FTS) and Sebastian platelet syndrome (SPS). Although caused by different MYH9 mutations, all patients present macrothrombocytopenia, but may later display other pathologies, including loss of hearing, renal failure and presenile cataracts. The correlation between the molecular and cellular effects of the different mutations and clinical presentation are beginning to be established. In this review, we correlate the defects that MYH9 mutations cause at a molecular and cellular level (for example, deficient filament formation, altered ATPase activity or actin-binding) with the clinical presentation of the syndromes in human patients. We address why these syndromes are tissue restricted, and the existence of possible compensatory mechanisms, including residual activity of mutant NMII-A and/ or the formation of heteropolymers or co-polymers with other NMII isoforms.
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Affiliation(s)
| | | | - Miguel Vicente-Manzanares
- Molecular Mechanisms Program, Centro de Investigación del Cáncer and Instituto de Biología Molecular y Celular del Cáncer, Consejo Superior de Investigaciones Científicas (CSIC)-University of Salamanca, 37007 Salamanca, Spain; (G.A.-J.); (C.L.-G.)
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21
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Nurden AT, Nurden P. Inherited thrombocytopenias: history, advances and perspectives. Haematologica 2020; 105:2004-2019. [PMID: 32527953 PMCID: PMC7395261 DOI: 10.3324/haematol.2019.233197] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2020] [Accepted: 05/08/2020] [Indexed: 12/11/2022] Open
Abstract
Over the last 100 years the role of platelets in hemostatic events and their production by megakaryocytes have gradually been defined. Progressively, thrombocytopenia was recognized as a cause of bleeding, first through an acquired immune disorder; then, since 1948, when Bernard-Soulier syndrome was first described, inherited thrombocytopenia became a fascinating example of Mendelian disease. The platelet count is often severely decreased and platelet size variable; associated platelet function defects frequently aggravate bleeding. Macrothrombocytopenia with variable proportions of enlarged platelets is common. The number of circulating platelets will depend on platelet production, consumption and lifespan. The bulk of macrothrombocytopenias arise from defects in megakaryopoiesis with causal variants in transcription factor genes giving rise to altered stem cell differentiation and changes in early megakaryocyte development and maturation. Genes encoding surface receptors, cytoskeletal and signaling proteins also feature prominently and Sanger sequencing associated with careful phenotyping has allowed their early classification. It quickly became apparent that many inherited thrombocytopenias are syndromic while others are linked to an increased risk of hematologic malignancies. In the last decade, the application of next-generation sequencing, including whole exome sequencing, and the use of gene platforms for rapid testing have greatly accelerated the discovery of causal genes and extended the list of variants in more common disorders. Genes linked to an increased platelet turnover and apoptosis have also been identified. The current challenges are now to use next-generation sequencing in first-step screening and to define bleeding risk and treatment better.
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Affiliation(s)
- Alan T Nurden
- Institut Hospitalo-Universitaire LIRYC, Pessac, France
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22
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Genetic Inheritance of Late-Onset, Down-Sloping Hearing Loss and Its Implications for Auditory Rehabilitation. Ear Hear 2020; 41:114-124. [DOI: 10.1097/aud.0000000000000734] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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23
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Ai Q, Zhao L, Yin J, Jiang L, Jin Q, Hu X, Chen S. A novel de novo MYH9 mutation in MYH9-related disease: A case report and review of literature. Medicine (Baltimore) 2020; 99:e18887. [PMID: 31977897 PMCID: PMC7004752 DOI: 10.1097/md.0000000000018887] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/04/2022] Open
Abstract
INTRODUCTION MYH9-related disease (MYH9-RD) is a rare autosomal dominant disorder caused by mutations in MYH9, which is responsible for encoding nonmuscle myosin heavy chains IIA (NMMHCIIA). MYH9-RD is clinically characterized by congenital macrothrombocytopenia, granulocyte inclusions variably associated with the risk of developing progressive sensorineural deafness, cataracts and nephropathy. PATIENT CONCERNS A 5-year-old boy had a history of a mild bleeding tendency and chronic thrombocytopenia, first identified at four months of age. No other family members were noted to have similar clinical features or hematologic disorders. DIAGNOSES The boy was diagnosed with MYH9-RD. Light microscopic examination of peripheral blood films (Wright-Giemsa stain) showed marked platelet macrocytosis with giant platelets and basophilic Döhle-like inclusions in 83% of the neutrophils. Immunofluorescence analysis disclosed a type II pattern, manifested by neutrophils which contained several circle-to-oval shaped cytoplasmic NMMMHCA-positive granules. Sequencing analysis of MYH9-RD genes was carried out and revealed a novel missense mutation of c.97T>G (p.W33G) in the patient but not in his parents. INTERVENTION No treatment is necessary. Recognition of MYH9-RD is important to Avoiding unnecessary and potentially harmful treatments. OUTCOMES The patient's condition remained stable during the follow-up. CONCLUSIONS As a result of identifying this missense mutation in this particular case, we have added c.97T>G (p.W33G) to the broad spectrum of potential MYH9 mutations.
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Affiliation(s)
- Qi Ai
- Department of Hematology and Oncology
| | | | - Jing Yin
- Department of Immunology, Tianjin Children's Hospital, Tianjin, China
| | | | | | | | - Sen Chen
- Department of Hematology and Oncology
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24
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Zhang W, Lian X, Sun Y, Hao J. A sporadic MYH9-related disease in a Chinese boy with p.A95T mutation. Hematology 2020; 25:34-36. [PMID: 31888422 DOI: 10.1080/16078454.2019.1706808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
Affiliation(s)
- Wenchao Zhang
- Department of Clinical Laboratory, The Second Hospital of Hebei Medical University, Shijiazhuang, People's Republic of China
| | - Xiaoqiang Lian
- Department of Clinical Laboratory, The Second Hospital of Hebei Medical University, Shijiazhuang, People's Republic of China
| | - Yifeng Sun
- Department of Clinical Laboratory, The Second Hospital of Hebei Medical University, Shijiazhuang, People's Republic of China
| | - Jihong Hao
- Department of Clinical Laboratory, The Second Hospital of Hebei Medical University, Shijiazhuang, People's Republic of China
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25
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Vincenot A, Saultier P, Kunishima S, Poggi M, Hurtaud-Roux MF, Roussel A, Actn Study Coinvestigators, Schlegel N, Alessi MC. Novel ACTN1 variants in cases of thrombocytopenia. Hum Mutat 2019; 40:2258-2269. [PMID: 31237726 PMCID: PMC6900141 DOI: 10.1002/humu.23840] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Revised: 05/10/2019] [Accepted: 05/28/2019] [Indexed: 11/11/2022]
Abstract
The ACTN1 gene has been implicated in inherited macrothrombocytopenia. To decipher the spectrum of variants and phenotype of ACTN1‐related thrombocytopenia, we sequenced the ACTN1 gene in 272 cases of unexplained chronic or familial thrombocytopenia. We identified 15 rare, monoallelic, nonsynonymous and likely pathogenic ACTN1 variants in 20 index cases from 20 unrelated families. Thirty‐one family members exhibited thrombocytopenia. Targeted sequencing was carried out on 12 affected relatives, which confirmed presence of the variant. Twenty‐eight of 32 cases with monoallelic ACTN1 variants had mild to no bleeding complications. Eleven cases harbored 11 different unreported ACTN1 variants that were monoallelic and likely pathogenic. Nine variants were located in the α‐actinin‐1 (ACTN1) rod domain and were predicted to hinder dimer formation. These variants displayed a smaller increase in platelet size compared with variants located outside the rod domain. In vitro expression of the new ACTN1 variants induced actin network disorganization and led to increased thickness of actin fibers. These findings expand the repertoire of ACTN1 variants associated with thrombocytopenia and highlight the high frequency of ACTN1‐related thrombocytopenia cases. The rod domain, like other ACTN1 functional domains, may be mutated resulting in actin disorganization in vitro and thrombocytopenia with normal platelet size in most cases.
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Affiliation(s)
- Anne Vincenot
- CHU Robert Debré, National Reference Center for Inherited Platelet Disorders and Biological Hematology Service, AP-HP, Paris, France
| | - Paul Saultier
- Aix-Marseille Univ, INSERM, INRA, C2VN, Marseille, France
| | - Shinji Kunishima
- Department of Medical Technology, Gifu University of Medical Science, Seki, Gifu, Japan
| | - Marjorie Poggi
- Aix-Marseille Univ, INSERM, INRA, C2VN, Marseille, France
| | - Marie-Françoise Hurtaud-Roux
- CHU Robert Debré, National Reference Center for Inherited Platelet Disorders and Biological Hematology Service, AP-HP, Paris, France
| | - Alain Roussel
- Aix Marseille University, CNRS, AFMB, Marseille, France
| | | | - Nicole Schlegel
- CHU Robert Debré, National Reference Center for Inherited Platelet Disorders and Biological Hematology Service, AP-HP, Paris, France
| | - Marie-Christine Alessi
- Aix-Marseille Univ, INSERM, INRA, C2VN, Marseille, France.,APHM, CHU Timone, French Reference Center for Inherited Platelet Disorders, Marseille, France
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26
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Bury L, Megy K, Stephens JC, Grassi L, Greene D, Gleadall N, Althaus K, Allsup D, Bariana TK, Bonduel M, Butta NV, Collins P, Curry N, Deevi SVV, Downes K, Duarte D, Elliott K, Falcinelli E, Furie B, Keeling D, Lambert MP, Linger R, Mangles S, Mapeta R, Millar CM, Penkett C, Perry DJ, Stirrups KE, Turro E, Westbury SK, Wu J, BioResource N, Gomez K, Freson K, Ouwehand WH, Gresele P, Simeoni I. Next-generation sequencing for the diagnosis of MYH9-RD: Predicting pathogenic variants. Hum Mutat 2019; 41:277-290. [PMID: 31562665 PMCID: PMC6972977 DOI: 10.1002/humu.23927] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2019] [Revised: 09/19/2019] [Accepted: 09/25/2019] [Indexed: 12/20/2022]
Abstract
The heterogeneous manifestations of MYH9‐related disorder (MYH9‐RD), characterized by macrothrombocytopenia, Döhle‐like inclusion bodies in leukocytes, bleeding of variable severity with, in some cases, ear, eye, kidney, and liver involvement, make the diagnosis for these patients still challenging in clinical practice. We collected phenotypic data and analyzed the genetic variants in more than 3,000 patients with a bleeding or platelet disorder. Patients were enrolled in the BRIDGE‐BPD and ThromboGenomics Projects and their samples processed by high throughput sequencing (HTS). We identified 50 patients with a rare variant in MYH9. All patients had macrothrombocytes and all except two had thrombocytopenia. Some degree of bleeding diathesis was reported in 41 of the 50 patients. Eleven patients presented hearing impairment, three renal failure and two elevated liver enzymes. Among the 28 rare variants identified in MYH9, 12 were novel. HTS was instrumental in diagnosing 23 patients (46%). Our results confirm the clinical heterogeneity of MYH9‐RD and show that, in the presence of an unclassified platelet disorder with macrothrombocytes, MYH9‐RD should always be considered. A HTS‐based strategy is a reliable method to reach a conclusive diagnosis of MYH9‐RD in clinical practice.
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Affiliation(s)
- Loredana Bury
- Department of Internal Medicine, Section of Internal and Cardiovascular Medicine, University of Perugia, Perugia, Italy
| | - Karyn Megy
- Department of Haematology, University of Cambridge, Cambridge Biomedical Campus, Cambridge, UK.,NIHR BioResource - Rare Diseases, Cambridge Biomedical Campus, Cambridge University Hospitals, Cambridge, UK
| | - Jonathan C Stephens
- Department of Haematology, University of Cambridge, Cambridge Biomedical Campus, Cambridge, UK.,NIHR BioResource - Rare Diseases, Cambridge Biomedical Campus, Cambridge University Hospitals, Cambridge, UK
| | - Luigi Grassi
- Department of Haematology, University of Cambridge, Cambridge Biomedical Campus, Cambridge, UK.,NIHR BioResource - Rare Diseases, Cambridge Biomedical Campus, Cambridge University Hospitals, Cambridge, UK
| | - Daniel Greene
- Department of Haematology, University of Cambridge, Cambridge Biomedical Campus, Cambridge, UK.,NIHR BioResource - Rare Diseases, Cambridge Biomedical Campus, Cambridge University Hospitals, Cambridge, UK.,Department of Haematology, Addenbrooke's Hospital, Cambridge Biomedical Campus, Cambridge University Hospitals NHS Foundation Trust, Cambridge, UK
| | - Nick Gleadall
- Department of Haematology, University of Cambridge, Cambridge Biomedical Campus, Cambridge, UK.,NIHR BioResource - Rare Diseases, Cambridge Biomedical Campus, Cambridge University Hospitals, Cambridge, UK
| | - Karina Althaus
- Institute for Immunology and Transfusion Medicine, Universitätsmedizin Greifswald Ernst-Moritz-Arndt University Greifswald, Greifswald, Germany.,Transfusion Medicine, Medical Faculty Tübingen, Tübingen, Germany
| | - David Allsup
- Hull York Medical School, University of Hull, York, UK
| | - Tadbir K Bariana
- Department of Haematology, University of Cambridge, Cambridge Biomedical Campus, Cambridge, UK.,NIHR BioResource - Rare Diseases, Cambridge Biomedical Campus, Cambridge University Hospitals, Cambridge, UK.,The Katharine Dormandy Haemophilia Centre and Thrombosis Unit, Royal Free London NHS Foundation Trust, London, UK
| | - Mariana Bonduel
- Hematology/Oncology Department, Hospital de Pediatría "Prof. Dr. Juan P. Garrahan", Buenos Aires, Argentina
| | - Nora V Butta
- Servicio de Hematología y Hemoterapia Hospital, Universitario La Paz-IDIPaz, Madrid, Spain
| | - Peter Collins
- Arthur Bloom Haemophilia Centre, Institute of Infection and Immunity, School of Medicine, Cardiff University, UK
| | - Nicola Curry
- Department of Clinical Haematology, Oxford Haemophilia and Thrombosis Centre, Oxford University Hospitals NHS Trust, Churchill Hospital, Oxford, UK
| | - Sri V V Deevi
- Department of Haematology, University of Cambridge, Cambridge Biomedical Campus, Cambridge, UK.,NIHR BioResource - Rare Diseases, Cambridge Biomedical Campus, Cambridge University Hospitals, Cambridge, UK
| | - Kate Downes
- Department of Haematology, University of Cambridge, Cambridge Biomedical Campus, Cambridge, UK.,NIHR BioResource - Rare Diseases, Cambridge Biomedical Campus, Cambridge University Hospitals, Cambridge, UK
| | - Daniel Duarte
- Department of Haematology, University of Cambridge, Cambridge Biomedical Campus, Cambridge, UK.,NIHR BioResource - Rare Diseases, Cambridge Biomedical Campus, Cambridge University Hospitals, Cambridge, UK
| | - Kim Elliott
- Oxford Haemophilia & Thrombosis Centre, Department of Haematology, Oxford University Hospitals NHS Trust, Churchill Hospital, Oxford and the NIHR BRC, Blood Theme, Oxford Centre for Haematology, Oxford, UK
| | - Emanuela Falcinelli
- Department of Internal Medicine, Section of Internal and Cardiovascular Medicine, University of Perugia, Perugia, Italy
| | - Bruce Furie
- Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts
| | | | - Michele P Lambert
- Department of Pediatrics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania.,Division of Hematology, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
| | - Rachel Linger
- Department of Haematology, University of Cambridge, Cambridge Biomedical Campus, Cambridge, UK.,NIHR BioResource - Rare Diseases, Cambridge Biomedical Campus, Cambridge University Hospitals, Cambridge, UK
| | - Sarah Mangles
- Basingstoke and Hampshire Hospital, NHS Foundation Trust, UK
| | - Rutendo Mapeta
- Department of Haematology, University of Cambridge, Cambridge Biomedical Campus, Cambridge, UK.,NIHR BioResource - Rare Diseases, Cambridge Biomedical Campus, Cambridge University Hospitals, Cambridge, UK
| | - Carolyn M Millar
- Hampshire Hospital NHS Foundation Trust, UK.,Centre for Haematology, Hammersmith Campus, Imperial College Academic Health Sciences Centre, Imperial College London, London, UK
| | - Christopher Penkett
- Department of Haematology, University of Cambridge, Cambridge Biomedical Campus, Cambridge, UK.,NIHR BioResource - Rare Diseases, Cambridge Biomedical Campus, Cambridge University Hospitals, Cambridge, UK
| | - David J Perry
- Department of Haematology, Addenbrooke's Hospital, Cambridge Biomedical Campus, Cambridge University Hospitals NHS Foundation Trust, Cambridge, UK
| | - Kathleen E Stirrups
- Department of Haematology, University of Cambridge, Cambridge Biomedical Campus, Cambridge, UK.,NIHR BioResource - Rare Diseases, Cambridge Biomedical Campus, Cambridge University Hospitals, Cambridge, UK
| | - Ernest Turro
- Department of Haematology, University of Cambridge, Cambridge Biomedical Campus, Cambridge, UK.,NIHR BioResource - Rare Diseases, Cambridge Biomedical Campus, Cambridge University Hospitals, Cambridge, UK.,Medical Research Council Biostatistics Unit, Cambridge Biomedical Campus, Cambridge Institute of Public Health, Cambridge, UK
| | - Sarah K Westbury
- School of Cellular and Molecular Medicine, University of Bristol, Bristol, UK
| | - John Wu
- British Columbia Children's Hospital, Vancouver, Canada
| | - Nihr BioResource
- NIHR BioResource, Cambridge Biomedical Campus, Cambridge University Hospitals, Cambridge, UK
| | - Keith Gomez
- Transfusion Medicine, Medical Faculty Tübingen, Tübingen, Germany
| | - Kathleen Freson
- Department of Cardiovascular Sciences, Center for Molecular and Vascular Biology, KU Leuven, Leuven, Belgium
| | - Willem H Ouwehand
- Department of Haematology, University of Cambridge, Cambridge Biomedical Campus, Cambridge, UK.,NIHR BioResource - Rare Diseases, Cambridge Biomedical Campus, Cambridge University Hospitals, Cambridge, UK.,NHS Blood and Transplant, Cambridge Biomedical Campus, Cambridge, UK.,Wellcome Trust Genome Campus, Wellcome Trust Sanger Institute, Cambridge, UK
| | - Paolo Gresele
- Department of Internal Medicine, Section of Internal and Cardiovascular Medicine, University of Perugia, Perugia, Italy
| | - Ilenia Simeoni
- Department of Haematology, University of Cambridge, Cambridge Biomedical Campus, Cambridge, UK.,NIHR BioResource - Rare Diseases, Cambridge Biomedical Campus, Cambridge University Hospitals, Cambridge, UK
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27
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Wang Z, Huang C, Sun Y, Lv H, Zhang M, Li X. Novel mutations associated with autosomal-dominant congenital cataract identified in Chinese families. Exp Ther Med 2019; 18:2701-2710. [PMID: 31555371 DOI: 10.3892/etm.2019.7865] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2018] [Accepted: 07/05/2019] [Indexed: 01/02/2023] Open
Abstract
As the leading cause of impaired vision, congenital cataracts, particularly autosomal dominant congenital cataract (ADCC), have been considered as a hereditary disease. The present study aimed to identify genetic defects in Chinese pedigrees with ADCC. A total of 6 Chinese families with ADCC were included, comprising 103 members and 27 patients assessed in total. Genomic DNA samples were extracted from the peripheral blood of probands; mutations were determined using a specific eye disease enrichment panel with next-generation sequencing. Following pathogenicity prediction, sites with notable pathogenicity were screened for further validation. Sanger sequencing was performed in the remaining individuals of the families and 100 normal controls. The pathogenic effects of the mutations, including amino acid substitutions, as well as structural and functional alterations of proteins linked to ADCC, were investigated via bioinformatics analysis. A total of seven mutations in six candidate genes associated with ADCC were identified in the 6 families: Myosin heavy chain 9 (MYH9) c.4150G>C, β-crystallin A4 (CRYBA4) c.169T>C, RPGR-interacting protein 1 (RPGRRIP1) c.2669G>A, wolframin (WFS1) c.1235T>C, CRYBA4 c.26C>T, Ephrin receptor subfamily 2 (EPHA2) c.2663+1G>A and paired box 6 (PAX6) c.11-2A>G. The seven mutations were only detected in affected individuals. Among them, there were three novel mutations (MYH9: c.4150G>C; CRYBA4: c.169T>C; RPGRRIP1: c.2669G>A) and four previously reported ones. Mutations in RPGRIP1 (c.2669G>A) and CRYBA4 (c.26C>T) were predicted to be benign according to bioinformatics analysis. Conversely, other mutations in EPHA2, PAX6, MYH9, CRYBA4 (c.169T>C) and WFS1 were determined to be pathogenic. The present study reported two novel heterozygous mutations (MYH9 c.4150G>C and CRYBA4 c.169T>C) identified by analyzing 6 Chinese families with ADCC, supporting their important roles in the development of the disease.
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Affiliation(s)
- Zhenyu Wang
- Department of Ophthalmology, Peking University Third Hospital, Beijing 100191, P.R. China.,Beijing Key Laboratory of Restoration of Damaged Ocular Nerve, Peking University Third Hospital, Beijing 100191, P.R. China
| | - Chen Huang
- Department of Ophthalmology, Peking University Third Hospital, Beijing 100191, P.R. China.,Beijing Key Laboratory of Restoration of Damaged Ocular Nerve, Peking University Third Hospital, Beijing 100191, P.R. China.,Medical Research Center, Peking University Third Hospital, Beijing 100191, P.R. China
| | - Yanxiu Sun
- Department of Ophthalmology, Peking University Third Hospital, Beijing 100191, P.R. China.,Beijing Key Laboratory of Restoration of Damaged Ocular Nerve, Peking University Third Hospital, Beijing 100191, P.R. China
| | - Huibin Lv
- Department of Ophthalmology, Peking University Third Hospital, Beijing 100191, P.R. China.,Beijing Key Laboratory of Restoration of Damaged Ocular Nerve, Peking University Third Hospital, Beijing 100191, P.R. China
| | - Mingzhou Zhang
- Department of Ophthalmology, Peking University Third Hospital, Beijing 100191, P.R. China.,Beijing Key Laboratory of Restoration of Damaged Ocular Nerve, Peking University Third Hospital, Beijing 100191, P.R. China
| | - Xuemin Li
- Department of Ophthalmology, Peking University Third Hospital, Beijing 100191, P.R. China.,Beijing Key Laboratory of Restoration of Damaged Ocular Nerve, Peking University Third Hospital, Beijing 100191, P.R. China
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28
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Smith AS, Pal K, Nowak RB, Demenko A, Zaninetti C, Da Costa L, Favier R, Pecci A, Fowler VM. MYH9-related disease mutations cause abnormal red blood cell morphology through increased myosin-actin binding at the membrane. Am J Hematol 2019; 94:667-677. [PMID: 30916803 DOI: 10.1002/ajh.25472] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2018] [Revised: 03/21/2019] [Accepted: 03/25/2019] [Indexed: 01/29/2023]
Abstract
MYH9-related disease (MYH9-RD) is a rare, autosomal dominant disorder caused by mutations in MYH9, the gene encoding the actin-activated motor protein non-muscle myosin IIA (NMIIA). MYH9-RD patients suffer from bleeding syndromes, progressive kidney disease, deafness, and/or cataracts, but the impact of MYH9 mutations on other NMIIA-expressing tissues remains unknown. In human red blood cells (RBCs), NMIIA assembles into bipolar filaments and binds to actin filaments (F-actin) in the spectrin-F-actin membrane skeleton to control RBC biconcave disk shape and deformability. Here, we tested the effects of MYH9 mutations in different NMIIA domains (motor, coiled-coil rod, or non-helical tail) on RBC NMIIA function. We found that MYH9-RD does not cause clinically significant anemia and that patient RBCs have normal osmotic deformability as well as normal membrane skeleton composition and micron-scale distribution. However, analysis of complete blood count data and peripheral blood smears revealed reduced hemoglobin content and elongated shapes, respectively, of MYH9-RD RBCs. Patients with mutations in the NMIIA motor domain had the highest numbers of elongated RBCs. Patients with mutations in the motor domain also had elevated association of NMIIA with F-actin at the RBC membrane. Our findings support a central role for motor domain activity in NMIIA regulation of RBC shape and define a new sub-clinical phenotype of MYH9-RD.
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Affiliation(s)
- Alyson S. Smith
- Department of Molecular MedicineThe Scripps Research Institute La Jolla California
| | - Kasturi Pal
- Department of Molecular MedicineThe Scripps Research Institute La Jolla California
| | - Roberta B. Nowak
- Department of Molecular MedicineThe Scripps Research Institute La Jolla California
| | - Anastasiya Demenko
- Department of Molecular MedicineThe Scripps Research Institute La Jolla California
| | - Carlo Zaninetti
- Department of Internal MedicineIRCCS Policlinico San Matteo Foundation and University of Pavia Pavia Italy
| | - Lydie Da Costa
- AP‐HP, Service d'Hématologie BiologiqueHôpital R. Debré Paris France
- Université Paris 7Sorbonne Paris Cité Paris France
- INSERM U1134INTS Paris France
- Laboratoire d'Excellence GR‐Ex Paris France
| | - Remi Favier
- Assistance Publique‐Hôpitaux de Paris, Armand Trousseau Children HospitalFrench Reference Center for platelet disorders Paris France
| | - Alessandro Pecci
- Department of Internal MedicineIRCCS Policlinico San Matteo Foundation and University of Pavia Pavia Italy
| | - Velia M. Fowler
- Department of Molecular MedicineThe Scripps Research Institute La Jolla California
- Department of Biological SciencesUniversity of Delaware Newark Delaware
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29
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Abstract
Classically, phenotype is what is observed, and genotype is the genetic makeup. Statistical studies aim to project phenotypic likelihoods of genotypic patterns. The traditional genotype-to-phenotype theory embraces the view that the encoded protein shape together with gene expression level largely determines the resulting phenotypic trait. Here, we point out that the molecular biology revolution at the turn of the century explained that the gene encodes not one but ensembles of conformations, which in turn spell all possible gene-associated phenotypes. The significance of a dynamic ensemble view is in understanding the linkage between genetic change and the gained observable physical or biochemical characteristics. Thus, despite the transformative shift in our understanding of the basis of protein structure and function, the literature still commonly relates to the classical genotype-phenotype paradigm. This is important because an ensemble view clarifies how even seemingly small genetic alterations can lead to pleiotropic traits in adaptive evolution and in disease, why cellular pathways can be modified in monogenic and polygenic traits, and how the environment may tweak protein function.
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Affiliation(s)
- Ruth Nussinov
- Cancer and Inflammation Program, Leidos Biomedical Research, Inc., Frederick National Laboratory for Cancer Research, National Cancer Institute at Frederick, Frederick, Maryland, United States of America
- Sackler Institute of Molecular Medicine, Department of Human Genetics and Molecular Medicine, Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Chung-Jung Tsai
- Cancer and Inflammation Program, Leidos Biomedical Research, Inc., Frederick National Laboratory for Cancer Research, National Cancer Institute at Frederick, Frederick, Maryland, United States of America
| | - Hyunbum Jang
- Cancer and Inflammation Program, Leidos Biomedical Research, Inc., Frederick National Laboratory for Cancer Research, National Cancer Institute at Frederick, Frederick, Maryland, United States of America
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30
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Fewings E, Ziemer M, Hörtnagel K, Reicherter K, Larionov A, Redman J, Goldgraben MA, Pepler A, Hearn T, Firth H, Ha T, Schaller J, Adams DJ, Rytina E, van Steensel M, Tischkowitz M. Malta (MYH9 Associated Elastin Aggregation) Syndrome: Germline Variants in MYH9 Cause Rare Sweat Duct Proliferations and Irregular Elastin Aggregations. J Invest Dermatol 2019; 139:2238-2241.e6. [PMID: 31125547 DOI: 10.1016/j.jid.2019.03.1151] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Revised: 03/08/2019] [Accepted: 03/16/2019] [Indexed: 02/05/2023]
Affiliation(s)
- Eleanor Fewings
- Academic Department of Medical Genetics, University of Cambridge, Cambridge, United Kingdom
| | - Mirjana Ziemer
- Department of Dermatology, Venerology and Allergology, University of Leipzig Medical Center, Leipzig, Germany
| | - Konstanze Hörtnagel
- Center for Genomics and Transcriptomics and Praxis für Humangenetik Tübingen, Tübingen, Germany
| | - Kerstin Reicherter
- Center for Genomics and Transcriptomics and Praxis für Humangenetik Tübingen, Tübingen, Germany
| | - Alexey Larionov
- Academic Department of Medical Genetics, University of Cambridge, Cambridge, United Kingdom
| | - James Redman
- Academic Department of Medical Genetics, University of Cambridge, Cambridge, United Kingdom
| | - Mae A Goldgraben
- Academic Department of Medical Genetics, University of Cambridge, Cambridge, United Kingdom
| | - Alexander Pepler
- Center for Genomics and Transcriptomics and Praxis für Humangenetik Tübingen, Tübingen, Germany
| | - Tim Hearn
- Academic Department of Medical Genetics, University of Cambridge, Cambridge, United Kingdom
| | - Helen Firth
- East Anglian Medical Genetics Service, Cambridge University Hospitals National Health Service Foundation Trust, Cambridge Biomedical Campus, Cambridge, United Kingdom
| | - Tom Ha
- Department of Dermatology, Addenbrooke's Hospital, Cambridge, United Kingdom
| | | | - David J Adams
- Experimental Cancer Genetics, Wellcome Trust Sanger Institute, Hinxton, Cambridgeshire, United Kingdom
| | - Ed Rytina
- Department of Histopathology, Addenbrooke's Hospital, Cambridge, United Kingdom
| | - Maurice van Steensel
- Skin Research Institute of Singapore, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore; Lee Kong Chian Medical School, Nanyang Technological University, Singapore, Singapore
| | - Marc Tischkowitz
- Academic Department of Medical Genetics, University of Cambridge, Cambridge, United Kingdom; East Anglian Medical Genetics Service, Cambridge University Hospitals National Health Service Foundation Trust, Cambridge Biomedical Campus, Cambridge, United Kingdom.
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31
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Hashimoto J, Hamasaki Y, Takahashi Y, Kubota M, Yanagisawa T, Itabashi Y, Muramatsu M, Kawamura T, Kumagai N, Ohwada Y, Sakai K, Shishido S. Management of patients with severe Epstein syndrome: Review of four patients who received living‐donor renal transplantation. Nephrology (Carlton) 2019. [DOI: 10.1111/nep.13253] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- Junya Hashimoto
- Department of Pediatric NephrologyToho University Faculty of Medicine Tokyo Japan
| | - Yuko Hamasaki
- Department of Pediatric NephrologyToho University Faculty of Medicine Tokyo Japan
| | - Yusuke Takahashi
- Department of Pediatric NephrologyToho University Faculty of Medicine Tokyo Japan
| | - Mai Kubota
- Department of Pediatric NephrologyToho University Faculty of Medicine Tokyo Japan
| | - Taketo Yanagisawa
- Department of NephrologyToho University Faculty of Medicine Tokyo Japan
| | | | - Masaki Muramatsu
- Department of NephrologyToho University Faculty of Medicine Tokyo Japan
| | - Takeshi Kawamura
- Department of NephrologySakura Medical Center, Toho University Chiba Japan
| | - Naonori Kumagai
- Department of PediatricsTohoku University School of Medicine Miyagi Japan
| | - Yoko Ohwada
- Department of PediatricsDokkyo Medical University School of Medicine Tochigi Japan
| | - Ken Sakai
- Department of NephrologyToho University Faculty of Medicine Tokyo Japan
| | - Seiichiro Shishido
- Department of Pediatric NephrologyToho University Faculty of Medicine Tokyo Japan
- Department of NephrologyToho University Faculty of Medicine Tokyo Japan
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32
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Tabibzadeh N, Fleury D, Labatut D, Bridoux F, Lionet A, Jourde-Chiche N, Vrtovsnik F, Schlegel N, Vanhille P. MYH9-related disorders display heterogeneous kidney involvement and outcome. Clin Kidney J 2018; 12:494-502. [PMID: 31384440 PMCID: PMC6671426 DOI: 10.1093/ckj/sfy117] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Indexed: 11/14/2022] Open
Abstract
Background MYH9-related diseases (MYH9-RD) are autosomal dominant disorders caused by mutations of the MYH9 gene encoding the non-muscle myosin heavy chain IIA. They are characterized by congenital thrombocytopenia, giant platelets and leucocyte inclusions. Hearing impairment, pre-senile cataract and nephropathy can also occur. We aimed to evaluate renal involvement and outcome in MYH9-RD patients followed-up by nephrologists. Methods We conducted a retrospective multicentre observational study of 13 patients among 9 families with MYH9 mutation diagnosed by genetic testing and immunofluorescence assay referred to nephrologists. Results At initial referral, median age was 30 (range 14–76) years. Median estimated glomerular filtration rate was 66 mL/min/1.73 m2 (0–141) and two patients had already end-stage renal disease (ESRD). Renal presentation associated proteinuria (n = 12), haematuria (n = 6) and hypertension (n = 6). Three patients developed a rapid onset ESRD whereas five others had a relatively stable kidney function over a 3-year median follow-up (1–34). Extra-renal features varied widely, with hearing impairment in six patients, cataract in two and mild liver dysfunction in seven. Thrombocytopenia existed at referral in 11 patients. Time to diagnosis varied from 0 to 29 years (median 3 years). Initial diagnoses such as idiopathic thrombocytopenic purpura (n = 4) and focal segmental glomerulosclerosis (n = 1) led to corticosteroid administration (n = 4), intravenous immunoglobulins (n = 3), cyclophosphamide (n = 1) and splenectomy (n = 1). Conclusions Renal involvement and outcome in MYH9-RD are heterogeneous. The diagnosis is often delayed and misdiagnoses can lead to unnecessary treatments. MYH9-RD should be considered in any patient with glomerular involvement associated with a low or slightly decreased platelet count and/or hearing loss and liver dysfunction.
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Affiliation(s)
- Nahid Tabibzadeh
- Explorations Fonctionnelles Rénales, APHP Hôpital Bichat, DHU FIRE, CRI-Inserm U1149 et Université Paris Diderot, Paris, France
| | - Dominique Fleury
- Néphrologie et Médecine Interne, CH Valenciennes, Valenciennes, France
| | | | | | | | - Noémie Jourde-Chiche
- Aix-Marseille Univ, C2VN, INSERM 1263-INRA 1260, and AP-HM, Centre de Néphrologie et Transplantation Rénale, Hôpital de la Conception, Marseille, France
| | - François Vrtovsnik
- Néphrologie, APHP Hôpital Bichat, DHU FIRE, CRI-Inserm U1149 et Université Paris Diderot, Paris, France
| | - Nicole Schlegel
- CRCMH Pathologies Plaquettaires Robert Debré, APHP Hôpital Robert Debré, Paris, France
| | - Philippe Vanhille
- Néphrologie et Médecine Interne, CH Valenciennes, Valenciennes, France
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33
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van Dijk J, Bompard G, Cau J, Kunishima S, Rabeharivelo G, Mateos-Langerak J, Cazevieille C, Cavelier P, Boizet-Bonhoure B, Delsert C, Morin N. Microtubule polyglutamylation and acetylation drive microtubule dynamics critical for platelet formation. BMC Biol 2018; 16:116. [PMID: 30336771 PMCID: PMC6194603 DOI: 10.1186/s12915-018-0584-6] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2018] [Accepted: 10/03/2018] [Indexed: 11/10/2022] Open
Abstract
Background Upon maturation in the bone marrow, polyploid megakaryocytes elongate very long and thin cytoplasmic branches called proplatelets. Proplatelets enter the sinusoids blood vessels in which platelets are ultimately released. Microtubule dynamics, bundling, sliding, and coiling, drive these dramatic morphological changes whose regulation remains poorly understood. Microtubule properties are defined by tubulin isotype composition and post-translational modification patterns. It remains unknown whether microtubule post-translational modifications occur in proplatelets and if so, whether they contribute to platelet formation. Results Here, we show that in proplatelets from mouse megakaryocytes, microtubules are both acetylated and polyglutamylated. To bypass the difficulties of working with differentiating megakaryocytes, we used a cell model that allowed us to test the functions of these modifications. First, we show that α2bβ3integrin signaling in D723H cells is sufficient to induce β1tubulin expression and recapitulate the specific microtubule behaviors observed during proplatelet elongation and platelet release. Using this model, we found that microtubule acetylation and polyglutamylation occur with different spatio-temporal patterns. We demonstrate that microtubule acetylation, polyglutamylation, and β1tubulin expression are mandatory for proplatelet-like elongation, swelling formation, and cytoplast severing. We discuss the functional importance of polyglutamylation of β1tubulin-containing microtubules for their efficient bundling and coiling during platelet formation. Conclusions We characterized and validated a powerful cell model to address microtubule behavior in mature megakaryocytes, which allowed us to demonstrate the functional importance of microtubule acetylation and polyglutamylation for platelet release. Furthermore, we bring evidence of a link between the expression of a specific tubulin isotype, the occurrence of microtubule post-translational modifications, and the acquisition of specific microtubule behaviors. Thus, our findings could widen the current view of the regulation of microtubule behavior in cells such as osteoclasts, spermatozoa, and neurons, which express distinct tubulin isotypes and display specific microtubule activities during differentiation. Electronic supplementary material The online version of this article (10.1186/s12915-018-0584-6) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Juliette van Dijk
- Universités de Montpellier, 34293, Montpellier, France.,CRBM, CNRS, UMR 5237, 1919 Route de Mende, 34293, Montpellier, France
| | - Guillaume Bompard
- Universités de Montpellier, 34293, Montpellier, France.,IGH, CNRS UMR9002, 141, rue de la Cardonille, 34396, Montpellier, France
| | - Julien Cau
- Universités de Montpellier, 34293, Montpellier, France.,IGH, CNRS UMR9002, 141, rue de la Cardonille, 34396, Montpellier, France.,Montpellier Rio Imaging, 34293, Montpellier, France
| | - Shinji Kunishima
- Department of Advanced Diagnosis, National Hospital Organization Nagoya Medical Center, 4-1-1 Sannomaru, Naka-ku, Nagoya, 4600001, Japan.,Present address: Department of Medical Technology, Gifu University of Medical Science, Seki, Gifu, 5013892, Japan
| | - Gabriel Rabeharivelo
- Universités de Montpellier, 34293, Montpellier, France.,CRBM, CNRS, UMR 5237, 1919 Route de Mende, 34293, Montpellier, France
| | - Julio Mateos-Langerak
- Universités de Montpellier, 34293, Montpellier, France.,IGH, CNRS UMR9002, 141, rue de la Cardonille, 34396, Montpellier, France.,Montpellier Rio Imaging, 34293, Montpellier, France
| | - Chantal Cazevieille
- Universités de Montpellier, 34293, Montpellier, France.,INM, INSERM UMR1051, 34293, Montpellier, France
| | - Patricia Cavelier
- Universités de Montpellier, 34293, Montpellier, France.,IGMM, CNRS, UMR 5535, 1919 Route de Mende, 34293, Montpellier, France
| | - Brigitte Boizet-Bonhoure
- Universités de Montpellier, 34293, Montpellier, France.,IGH, CNRS UMR9002, 141, rue de la Cardonille, 34396, Montpellier, France
| | - Claude Delsert
- Universités de Montpellier, 34293, Montpellier, France.,CRBM, CNRS, UMR 5237, 1919 Route de Mende, 34293, Montpellier, France.,3AS Station Expérimentale d'Aquaculture Ifremer, Chemin de Maguelone, 34250, Palavas-les-Flots, France
| | - Nathalie Morin
- Universités de Montpellier, 34293, Montpellier, France. .,CRBM, CNRS, UMR 5237, 1919 Route de Mende, 34293, Montpellier, France.
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34
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Baliakas P, Kättström M, Rossing M, Amini R. Refractory chronic "ITP": When platelet size matters. Clin Case Rep 2018; 6:1779-1780. [PMID: 30214762 PMCID: PMC6132098 DOI: 10.1002/ccr3.1711] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2018] [Accepted: 06/11/2018] [Indexed: 11/08/2022] Open
Abstract
Inherited conditions associated with thrombocytopenia should be included in the differential diagnosis of young patients with refractory immune thrombocytopenia (ITP), even in the absence of a positive family history. Early identification of such conditions is of vital importance in order to reach the right diagnosis and avoid unnecessary or even harmful medication.
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Affiliation(s)
- Panagiotis Baliakas
- Department of Clinical GeneticsUppsala University HospitalUppsalaSweden
- Science for Life LaboratoryDepartment of Immunology, Genetics and PathologyUppsala UniversityUppsalaSweden
| | - Magdalena Kättström
- Section of HematologyDepartment of MedicineÖrebro University HospitalÖrebroSweden
| | - Maria Rossing
- Center for Genomic MedicineCopenhagen University HospitalCopenhagenDenmark
| | - Rose‐Marie Amini
- Department of Immunology, Genetics and PathologyClinical and Experimental PathologyUppsala University and Uppsala University HospitalUppsalaSweden
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35
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Pecci A, Ma X, Savoia A, Adelstein RS. MYH9: Structure, functions and role of non-muscle myosin IIA in human disease. Gene 2018; 664:152-167. [PMID: 29679756 PMCID: PMC5970098 DOI: 10.1016/j.gene.2018.04.048] [Citation(s) in RCA: 169] [Impact Index Per Article: 28.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2018] [Revised: 04/13/2018] [Accepted: 04/16/2018] [Indexed: 12/16/2022]
Abstract
The MYH9 gene encodes the heavy chain of non-muscle myosin IIA, a widely expressed cytoplasmic myosin that participates in a variety of processes requiring the generation of intracellular chemomechanical force and translocation of the actin cytoskeleton. Non-muscle myosin IIA functions are regulated by phosphorylation of its 20 kDa light chain, of the heavy chain, and by interactions with other proteins. Variants of MYH9 cause an autosomal-dominant disorder, termed MYH9-related disease, and may be involved in other conditions, such as chronic kidney disease, non-syndromic deafness, and cancer. This review discusses the structure of the MYH9 gene and its protein, as well as the regulation and physiologic functions of non-muscle myosin IIA with particular reference to embryonic development. Moreover, the review focuses on current knowledge about the role of MYH9 variants in human disease.
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Affiliation(s)
- Alessandro Pecci
- Department of Internal Medicine, IRCCS Policlinico San Matteo Foundation, University of Pavia, Piazzale Golgi, 27100 Pavia, Italy.
| | - Xuefei Ma
- Laboratory of Molecular Cardiology, National Heart, Lung, and Blood Institute, National Institutes of Health, Bldg. 10 Room 6C-103B, 10 Center Drive, Bethesda, MD 20892-1583, USA.
| | - Anna Savoia
- Department of Medical Sciences, University of Trieste, via Dell'Istria, 65/1, I-34137 Trieste, Italy; IRCCS Burlo Garofolo, via Dell'Istria, 65/1, I-34137 Trieste, Italy.
| | - Robert S Adelstein
- Laboratory of Molecular Cardiology, National Heart, Lung, and Blood Institute, National Institutes of Health, Bldg. 10 Room 6C-103B, 10 Center Drive, Bethesda, MD 20892-1583, USA.
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Nurden P, Nurden A, Favier R, Gleyze M. Management of pregnancy for a patient with the new syndromic macrothrombocytopenia, DIAPH1-related disease. Platelets 2018; 29:737-738. [PMID: 29985732 DOI: 10.1080/09537104.2018.1492710] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The number of genes involved in the identification of macrothrombocytopenia (MTP) is growing but the clinical consequences for the affected patients are not well determined. Here, we report the management of the bleeding risk for a patient with the newly reported and rare DIAPH1-related disease during surgery for infertility and then during her subsequent pregnancy. The R1213* DIAPH1 variant responsible for a mild bleeding syndrome in six families was considered a potential risk factor for our patient. Preliminary laparoscopic surgery was followed by neosalpingostomy to open the obstructed fallopian tube that was followed by an ectopic pregnancy requiring further surgery, tranexamic acid was used on each occasion and no bleeding complications were observed. A second pregnancy proceeded to term; the mother's platelet count was controlled throughout the gestation period and remained close to her basal values. No bleeding occurred at delivery or during the postpartum period. In conclusion, with strict repeated assessments of blood parameters and maintenance of the platelet count, the bleeding risk in pregnancy in DIAPH1-related disease can be successfully controlled.
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Affiliation(s)
- Paquita Nurden
- a Institut Hospitalo-Universitaire LIRYC , Hôpital Xavier Arnozan , Pessac , France
| | - Alan Nurden
- a Institut Hospitalo-Universitaire LIRYC , Hôpital Xavier Arnozan , Pessac , France
| | - Rémi Favier
- b Assistance Publique-Hôpitaux de Paris , Hôpital A Trousseau , Paris , France
| | - Matthieu Gleyze
- c Service de Gynécologie-Obstétrique , Hôpital Pellegrin , Bordeaux , France
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Guo X, Lian X, Zhang W, Hao J. A D1424N mutation in the MYH9 gene results in macrothrombocytopenia and granulocytic inclusion bodies in a Chinese inherited macrothrombocytopenia pedigree. Clin Chem Lab Med 2018; 56:e171-e173. [PMID: 29451856 DOI: 10.1515/cclm-2017-0813] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Accepted: 12/15/2017] [Indexed: 11/15/2022]
Affiliation(s)
- Xin Guo
- Clinical Laboratory, The Second Hospital of Hebei Medical University, Shijiazhuang, P.R. China
| | - Xiaoqiang Lian
- Clinical Laboratory, The Second Hospital of Hebei Medical University, Shijiazhuang, P.R. China
| | - Wenchao Zhang
- Clinical Laboratory, The Second Hospital of Hebei Medical University, Shijiazhuang, P.R. China
| | - Jihong Hao
- Clinical Laboratory, The Second Hospital of Hebei Medical University, 215#, Heping West Road, Shijiazhuang, 050000, Hebei Province, P.R. China, Phone: +86-0311-66002720, Fax: +86-0311-66002213
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Balduini A, Raslova H, Di Buduo CA, Donada A, Ballmaier M, Germeshausen M, Balduini CL. Clinic, pathogenic mechanisms and drug testing of two inherited thrombocytopenias, ANKRD26-related Thrombocytopenia and MYH9-related diseases. Eur J Med Genet 2018; 61:715-722. [PMID: 29545013 DOI: 10.1016/j.ejmg.2018.01.014] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2017] [Revised: 01/08/2018] [Accepted: 01/27/2018] [Indexed: 12/21/2022]
Abstract
Inherited thrombocytopenias (ITs) are a heterogeneous group of disorders characterized by low platelet count resulting in impaired hemostasis. Patients can have spontaneous hemorrhages and/or excessive bleedings provoked by hemostatic challenges as trauma or surgery. To date, ITs encompass 32 different rare monogenic disorders caused by mutations of 30 genes. This review will focus on the major discoveries that have been made in the last years on the diagnosis, treatment and molecular mechanisms of ANKRD26-Related Thrombocytopenia and MYH9-Related Diseases. Furthermore, we will discuss the use a Thrombopoietin mimetic as a novel approach to treat the thrombocytopenia in these patients. We will propose the use of a new 3D bone marrow model to study the mechanisms of action of these drugs and to test their efficacy and safety in patients. The overall purpose of this review is to point out that important progresses have been made in understanding the pathogenesis of ANKRD26-Related Thrombocytopenia and MYH9-Related Diseases and new therapeutic approaches have been proposed and tested. Future advancement in this research will rely in the development of more physiological models to study the regulation of human platelet biogenesis, disease mechanisms and specific pharmacologic targets.
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Affiliation(s)
- Alessandra Balduini
- University of Pavia, Pavia, Italy; IRCCS Policlinico San Matteo Foundation, Pavia, Italy.
| | - Hana Raslova
- INSERM UMR 1170, Gustave Roussy Cancer Campus, Université Paris-Saclay, Equipe Labellisée par la Ligue Nationale Contre le Cancer, Villejuif, France
| | - Christian A Di Buduo
- University of Pavia, Pavia, Italy; IRCCS Policlinico San Matteo Foundation, Pavia, Italy
| | - Alessandro Donada
- INSERM UMR 1170, Gustave Roussy Cancer Campus, Université Paris-Saclay, Equipe Labellisée par la Ligue Nationale Contre le Cancer, Villejuif, France
| | | | | | - Carlo L Balduini
- University of Pavia, Pavia, Italy; IRCCS Policlinico San Matteo Foundation, Pavia, Italy.
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Liu T, Hu Y, Guo S, Tan L, Zhan Y, Yang L, Liu W, Wang N, Li Y, Zhang Y, Liu C, Yang Y, Adelstein RS, Wang A. Identification and characterization of MYH9 locus for high efficient gene knock-in and stable expression in mouse embryonic stem cells. PLoS One 2018; 13:e0192641. [PMID: 29438440 PMCID: PMC5811019 DOI: 10.1371/journal.pone.0192641] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2017] [Accepted: 01/26/2018] [Indexed: 01/22/2023] Open
Abstract
Targeted integration of exogenous genes into so-called safe harbors/friend sites, offers the advantages of expressing normal levels of target genes and preventing potentially adverse effects on endogenous genes. However, the ideal genomic loci for this purpose remain limited. Additionally, due to the inherent and unresolved issues with the current genome editing tools, traditional embryonic stem (ES) cell-based targeted transgenesis technology is still preferred in practical applications. Here, we report that a high and repeatable homologous recombination (HR) frequency (>95%) is achieved when an approximate 6kb DNA sequence flanking the MYH9 gene exon 2 site is used to create the homology arms for the knockout/knock-in of diverse nonmuscle myosin II (NM II) isoforms in mouse ES cells. The easily obtained ES clones greatly facilitated the generation of multiple NM II genetic replacement mouse models, as characterized previously. Further investigation demonstrated that though the targeted integration site for exogenous genes is shifted to MYH9 intron 2 (about 500bp downstream exon 2), the high HR efficiency and the endogenous MYH9 gene integrity are not only preserved, but the expected expression of the inserted gene(s) is observed in a pre-designed set of experiments conducted in mouse ES cells. Importantly, we confirmed that the expression and normal function of the endogenous MYH9 gene is not affected by the insertion of the exogenous gene in these cases. Therefore, these findings suggest that like the commonly used ROSA26 site, the MYH9 gene locus may be considered a new safe harbor for high-efficiency targeted transgenesis and for biomedical applications.
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Affiliation(s)
- Tanbin Liu
- Lab of Animal Models and Functional Genomics (LAMFG), The Key Laboratory of Animal Vaccine & Protein Engineering, College of Veterinary Medicine, Hunan Agricultural University (HUNAU), Changsha, Hunan, China
| | - Yi Hu
- Lab of Animal Models and Functional Genomics (LAMFG), The Key Laboratory of Animal Vaccine & Protein Engineering, College of Veterinary Medicine, Hunan Agricultural University (HUNAU), Changsha, Hunan, China
| | - Shiyin Guo
- College of Food Science and Technology, HUNAU, Changsha, Hunan, China
| | - Lei Tan
- Lab of Animal Models and Functional Genomics (LAMFG), The Key Laboratory of Animal Vaccine & Protein Engineering, College of Veterinary Medicine, Hunan Agricultural University (HUNAU), Changsha, Hunan, China
| | - Yang Zhan
- Lab of Functional Proteomics (LFP), The Key Laboratory of Animal Vaccine & Protein Engineering, College of Veterinary Medicine, HUNAU, Changsha, Hunan, China
| | - Lingchen Yang
- Lab of Animal Models and Functional Genomics (LAMFG), The Key Laboratory of Animal Vaccine & Protein Engineering, College of Veterinary Medicine, Hunan Agricultural University (HUNAU), Changsha, Hunan, China
| | - Wei Liu
- Lab of Animal Models and Functional Genomics (LAMFG), The Key Laboratory of Animal Vaccine & Protein Engineering, College of Veterinary Medicine, Hunan Agricultural University (HUNAU), Changsha, Hunan, China
| | - Naidong Wang
- Lab of Functional Proteomics (LFP), The Key Laboratory of Animal Vaccine & Protein Engineering, College of Veterinary Medicine, HUNAU, Changsha, Hunan, China
| | - Yalan Li
- Lab of Animal Models and Functional Genomics (LAMFG), The Key Laboratory of Animal Vaccine & Protein Engineering, College of Veterinary Medicine, Hunan Agricultural University (HUNAU), Changsha, Hunan, China
| | - Yingfan Zhang
- Lab of Molecular Cardiology (LMC), National Heart, Lung, and Blood Institute (NHLBI)/National Institutes of Health (NIH), Bethesda, MD, United States of America
| | - Chengyu Liu
- Transgenic Core, NHLBI/ NIH, Bethesda, MD, United States of America
| | - Yi Yang
- Lab of Functional Proteomics (LFP), The Key Laboratory of Animal Vaccine & Protein Engineering, College of Veterinary Medicine, HUNAU, Changsha, Hunan, China
| | - Robert S. Adelstein
- Lab of Molecular Cardiology (LMC), National Heart, Lung, and Blood Institute (NHLBI)/National Institutes of Health (NIH), Bethesda, MD, United States of America
| | - Aibing Wang
- Lab of Animal Models and Functional Genomics (LAMFG), The Key Laboratory of Animal Vaccine & Protein Engineering, College of Veterinary Medicine, Hunan Agricultural University (HUNAU), Changsha, Hunan, China
- Lab of Molecular Cardiology (LMC), National Heart, Lung, and Blood Institute (NHLBI)/National Institutes of Health (NIH), Bethesda, MD, United States of America
- * E-mail:
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Macrothrombocytopenia With Congenital Bilateral Cataracts: A Phenotype of MYH9 Disorder With Exon 24 Indel Mutations. J Pediatr Hematol Oncol 2018; 40:76-78. [PMID: 29200148 DOI: 10.1097/mph.0000000000000998] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
MYH9 disorder is characterized by large platelets and granulocyte inclusion bodies, and can be complicated with young-adult onsets of nephropathy, sensorineural hearing loss, and cataracts. Congenital cataracts in patients with MYH9 disorder is rare, and their etiology has not been elucidated. We report a 3-year-old patient with MYH9 disorder who had a p.E1066_A1072del mutation and developed cataracts congenitally. A review of the literature reveals that patients with an MYH9 exon 24 indel mutation, including p.E1066_A1072del, are susceptible to developing congenital cataracts and should be followed closely for other nonhematological complications.
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Hao J, Kada A, Kunishima S. Further classification of neutrophil non-muscle myosin heavy chain-IIA localization for efficient genetic diagnosis of MYH9 disorders. Ann Hematol 2017; 97:709-711. [PMID: 29199357 DOI: 10.1007/s00277-017-3195-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2017] [Accepted: 11/22/2017] [Indexed: 11/28/2022]
Affiliation(s)
- Jihong Hao
- Department of Advanced Diagnosis, Clinical Research Center, National Hospital Organization Nagoya Medical Center, 4-1-1 Sannomaru, Naka-ku, Nagoya, 4600001, Japan. .,Department of Clinical Laboratory, The Second Hospital of Hebei Medical University, 215# Heping West Road, Shijiazhuang, Hebei Province, 050000, China.
| | - Akiko Kada
- Department of Epidemiological and Health Services Research, Clinical Research Center, National Hospital Organization Nagoya Medical Center, Nagoya, Japan
| | - Shinji Kunishima
- Department of Advanced Diagnosis, Clinical Research Center, National Hospital Organization Nagoya Medical Center, 4-1-1 Sannomaru, Naka-ku, Nagoya, 4600001, Japan.
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Wang Y, Li D, Xu Y, Ma L, Lu Y, Wang Z, Wang L, Zhang W, Pan Y. Functional Effects of SNPs in MYH9 and Risks of Nonsyndromic Orofacial Clefts. J Dent Res 2017; 97:388-394. [PMID: 29207917 DOI: 10.1177/0022034517743930] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Nonsyndromic orofacial clefts (NSOCs) are congenital newborn malformations. Myosin heavy chain 9 ( MYH9) is a candidate gene of NSOCs. To investigate the associations between single-nucleotide polymorphisms (SNPs) of MYH9 and NSOC susceptibility, a 2-stage case-control study was designed and 4 potentially functional SNPs of MYH9 (rs12107, rs2269529, rs9619601, rs5756130) were selected and genotyped by iPLEX Sequenom MassARRAY and TaqMan assay in the first stage (599 NSOC cases and 590 controls). The significant SNPs in the first stage were replicated in the second stage (676 NSOC cases and 705 controls) by TaqMan assay. Reverse transcription polymerase chain reaction, cell transfection, and luciferase assay were performed accordingly to explore their functionality. In stage I, rs12107 was nominally associated with NSOCs, whereas rs2269529 showed a significant association (rs12107: Phet = 0.028; rs2269529: Phet = 0.001). In stage II, rs12107 was nominally associated with NSOCs, and rs2269529 showed a significant association (rs12107: Phom = 0.014; rs2269529: Phet = 0.006). In combined stages, these 2 SNPs gained significant associations (rs12107: Pdom = 0.004; rs2269529: Pdom = 4.4 × 10-5). In subphenotype analysis, these 2 SNPs were associated with cleft lip only (CLO) and cleft lip with palate (CLP), and rs2269529 was also associated with cleft palate only (CPO). Haplotype analysis revealed associations between rs12107-G/rs2269529-T and NSOC susceptibility ( P = 0.011). Combined analysis of rs12107 and rs2269529 indicated the risk of NSOCs increased with the number of risk alleles (rs12107-G and rs2269529-T, P for trend = 0.008). MYH9 SNP rs12107 AG + GG and rs2269529 CT + TT were associated with higher MYH9 expression in lip tissues compared with their corresponding wild-type homozygote. For rs12107, higher luciferase activities of G allele than A allele were observed in the luciferase assay. MYH9 was downregulated when transfecting its putative binding target miR-196b-3p into human embryo plate mesenchyme (HEPM) and C2C12 cell lines. For rs2269529, C > T contributed to increased MYH9 messenger RNA. In conclusion, rs12107 and rs2269529 were associated with the expression of MYH9 and contributed to the susceptibility of NSOCs.
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Affiliation(s)
- Y Wang
- 1 Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Nanjing, China
| | - D Li
- 1 Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Nanjing, China
| | - Y Xu
- 2 Shanghai Stomatological Hospital, Shanghai, China
| | - L Ma
- 1 Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Nanjing, China
| | - Y Lu
- 3 Department of Orthodontics, College of Stomatology, Dalian Medical University, Dalian, China
| | - Z Wang
- 1 Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Nanjing, China
| | - L Wang
- 1 Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Nanjing, China.,4 State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, China
| | - W Zhang
- 1 Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Nanjing, China
| | - Y Pan
- 1 Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Nanjing, China.,4 State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, China
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Nava T, Rivard GE, Bonnefoy A. Challenges on the diagnostic approach of inherited platelet function disorders: Is a paradigm change necessary? Platelets 2017; 29:148-155. [PMID: 29090587 DOI: 10.1080/09537104.2017.1356918] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Inherited platelet function disorders (IPFD) have been assessed for more than 50 years by aggregation- and secretion-based tests. Several decision trees are available intending to standardize the investigation of IPFD. A large variability of approaches is still in use among the laboratories across the world. In spite of costly and lengthy laboratory evaluation, the results have been found inconclusive or negative in a significant part of patients having bleeding manifestations. Molecular investigation of newly identified IPFD has recently contributed to a better understanding of the complexity of platelet function. Once considered "classic" IPFDs, Glanzmann thrombasthenia and Bernard-Soulier syndrome have each had their pathophysiology reassessed and their diagnosis made more precise and informative. Megakaryopoiesis, platelet formation, and function have been found tightly interlinked, with several genes being involved in both inherited thrombocytopenias and impaired platelet function. Moreover, genetic approaches have moved from being used as confirmatory diagnostic tests to being tools for identification of genetic variants associated with bleeding disorders, even in the absence of a clear phenotype in functional testing. In this study, we aim to address some limits of the conventional tests used for the diagnosis of IPFD, and to highlight the potential contribution of recent molecular tools and opportunities to rethink the way we should approach the investigation of IPFD.
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Affiliation(s)
- Tiago Nava
- a Centre Hospitalier Universitaire Sainte-Justine , Hematology and Oncology Division , Montréal , QC , Canada.,b Child and Adolescent Health, School of Medicine , Universidade Federal do Rio Grande do Sul (UFRGS) , Porto Alegre , Brazil
| | - Georges-Etienne Rivard
- a Centre Hospitalier Universitaire Sainte-Justine , Hematology and Oncology Division , Montréal , QC , Canada
| | - Arnaud Bonnefoy
- a Centre Hospitalier Universitaire Sainte-Justine , Hematology and Oncology Division , Montréal , QC , Canada
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44
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Canzi P, Pecci A, Manfrin M, Rebecchi E, Zaninetti C, Bozzi V, Benazzo M. Severe to profound deafness may be associated with MYH9-related disease: report of 4 patients. ACTA OTORHINOLARYNGOLOGICA ITALICA 2017; 36:415-420. [PMID: 27958602 PMCID: PMC5225798 DOI: 10.14639/0392-100x-702] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/28/2015] [Accepted: 04/30/2016] [Indexed: 11/24/2022]
Abstract
MYH9-related disease (MYH9-RD) is a rare genetic syndromic disorder characterised by congenital thrombocytopenia and is associated with the risk of developing progressive sensorineural hearing loss, nephropathy and presenile cataracts during childhood or adult life. All consecutive patients enrolled in the Italian Registry for MYH9-RD with severe to profound deafness were included in a retrospective study. The study population involved 147 Italian patients with MYH9-RD: hearing loss was identified in 52% of cases and only 4 patients (6%) presented severe to profound deafness at a mean age of 33 years. Deafness was associated with mild spontaneous bleeding in all patients and with kidney involvement in 3 cases. Cochlear implantation was carried out in 3 cases with benefit, and no major complications were observed. Diagnosis was performed about 28 years after the first clinical manifestation of MYH9-RD, which was never suspected by an otolaryngologist. The clinical and diagnostic aspects of 4 patients with severe to profound deafness are discussed with a focus on therapeutic implications.
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Affiliation(s)
- P Canzi
- Department of Otorhinolaryngology, IRCCS Policlinico San Matteo Foundation and University of Pavia, Italy
| | - A Pecci
- Department of Internal Medicine, IRCCS Policlinico San Matteo Foundation and University of Pavia, Italy
| | - M Manfrin
- Department of Otorhinolaryngology, IRCCS Policlinico San Matteo Foundation and University of Pavia, Italy
| | - E Rebecchi
- Department of Otorhinolaryngology, IRCCS Policlinico San Matteo Foundation and University of Pavia, Italy
| | - C Zaninetti
- Department of Internal Medicine, IRCCS Policlinico San Matteo Foundation and University of Pavia, Italy
| | - V Bozzi
- Department of Internal Medicine, IRCCS Policlinico San Matteo Foundation and University of Pavia, Italy
| | - M Benazzo
- Department of Otorhinolaryngology, IRCCS Policlinico San Matteo Foundation and University of Pavia, Italy
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Leinøe E, Zetterberg E, Kinalis S, Østrup O, Kampmann P, Norström E, Andersson N, Klintman J, Qvortrup K, Nielsen FC, Rossing M. Application of whole-exome sequencing to direct the specific functional testing and diagnosis of rare inherited bleeding disorders in patients from the Öresund Region, Scandinavia. Br J Haematol 2017; 179:308-322. [PMID: 28748566 PMCID: PMC5655919 DOI: 10.1111/bjh.14863] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Accepted: 06/20/2017] [Indexed: 01/19/2023]
Abstract
Rare inherited bleeding disorders (IBD) are a common cause of bleeding tendency. To ensure a correct diagnosis, specialized laboratory analyses are necessary. This study reports the results of an upfront diagnostic strategy using targeted whole exome sequencing. In total, 156 patients with a significant bleeding assessment tool score participated in the study, of which a third had thrombocytopenia. Eighty‐seven genes specifically associated with genetic predisposition to bleeding were analysed by whole exome sequencing. Variants were classified according to the five‐tier scheme. We identified 353 germline variants. Eight patients (5%) harboured a known pathogenic variant. Of the 345 previously unknown variants, computational analyses predicted 99 to be significant. Further filtration according to the Mendelian inheritance pattern, resulted in 59 variants being predicted to be clinically significant. Moreover, 34% (20/59) were assigned as novel class 4 or 5 variants upon targeted functional testing. A class 4 or 5 variant was identified in 30% of patients with thrombocytopenia (14/47) versus 11% of patients with a normal platelet count (12/109) (P < 0·01). An IBD diagnosis has a major clinical impact. The genetic investigations detailed here extricated our patients from a diagnostic conundrum, thus demonstrating that continuous optimization of the diagnostic work‐up of IBD is of great benefit.
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Affiliation(s)
- Eva Leinøe
- Department of Haematology, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
| | - Eva Zetterberg
- Department of Haematology, Coagulation Unit, Skaane University Hospital, Lund, Sweden
| | - Savvas Kinalis
- Centre for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
| | - Olga Østrup
- Centre for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
| | - Peter Kampmann
- Department of Haematology, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
| | - Eva Norström
- Department of Translational Medicine, Lund University, Skaane University Hospital, Lund, Sweden
| | - Nadine Andersson
- Department of Haematology, Coagulation Unit, Skaane University Hospital, Lund, Sweden
| | - Jenny Klintman
- Department of Haematology, Coagulation Unit, Skaane University Hospital, Lund, Sweden
| | - Klaus Qvortrup
- Department of Biomedical Sciences, Core Facility for Integrated Microscopy (CFIM), University of Copenhagen, Copenhagen, Denmark
| | - Finn Cilius Nielsen
- Centre for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
| | - Maria Rossing
- Centre for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
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Freson K, Turro E. High-throughput sequencing approaches for diagnosing hereditary bleeding and platelet disorders. J Thromb Haemost 2017; 15:1262-1272. [PMID: 28671349 DOI: 10.1111/jth.13681] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Hereditary bleeding and platelet disorders (BPDs) are characterized by marked genetic heterogeneity, far greater than previously appreciated. The list of genes involved in the regulation of megakaryopoiesis, platelet formation, platelet function and bleeding has been growing rapidly since the introduction of high-throughput sequencing (HTS) approaches in research. Thanks to the gradual adoption of HTS in diagnostic practice, these discoveries are improving the diagnostic yield for BPD patients, who may or may not present with bleeding problems and often have other clinical symptoms unrelated to the blood system. However, it was previously found that screening for all known etiologies gives a diagnostic yield of over 90% when the phenotype closely matches a known BPD but drops to 10% when the phenotype is indicative of a novel disorder. Thus, further research is needed to identify currently unknown etiologies for BPDs. Novel genes are likely to be found to be implicated in BPDs. New modes of inheritance, including digenic inheritance, are likely to play a role in some cases. Additionally, identifying and interpreting pathogenic variants outside exons is a looming challenge that can only be tackled with an improved understanding of the regulatory landscape of relevant cell types and with the transition from targeted sequencing to whole-genome sequencing in the clinic.
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Affiliation(s)
- K Freson
- Department of Cardiovascular Sciences, University of Leuven, Leuven, Belgium
| | - E Turro
- Department of Haematology and MRC Biostatistics Unit, University of Cambridge, Cambridge, UK
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Muzannar AM, Al Harbi M, Rathore R, Tawfeeq N, Wambi F, Mahmood N, Albrechtova S, Dimitriou V. Epidural anesthesia for labor and delivery in a patient with May-Hegglin anomaly: a case report. Local Reg Anesth 2017; 10:53-58. [PMID: 28496360 PMCID: PMC5417665 DOI: 10.2147/lra.s125811] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
We report a case of May-Hegglin anomaly (MHA) in a woman who had a successful labor and delivery under epidural anesthesia. MHA is an inherited thrombocytopenia easily misdiagnosed as idiopathic (immune) thrombocytopenic purpura (ITP). Early and appropriate diagnosis of MHA during pregnancy is essential for optimal maternal and neonatal delivery outcome. Additionally, it can avoid unnecessary diagnostic studies, such as bone marrow aspiration and biopsy, and even harmful therapies with corticosteroids, immunosuppressive agents, and splenectomy. Consequently, the most serious impacts of this disease are iatrogenic managements due to misdiagnosis. It seems that in patients with MHA, adequate clinical coagulation is far more dependent on adequate platelet function than any particular platelet count. The diagnosis of MHA may pose a challenge for clinicians managing pregnant women with thrombocytopenia.
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Affiliation(s)
- Annas Muhammad Muzannar
- Department of Anesthesia, King Abdulaziz Medical City, National Guard Health Affairs, Riyadh, Kingdom of Saudi Arabia
| | - Mohammed Al Harbi
- Department of Anesthesia, King Abdulaziz Medical City, National Guard Health Affairs, Riyadh, Kingdom of Saudi Arabia
| | - Raza Rathore
- Department of Anesthesia, King Abdulaziz Medical City, National Guard Health Affairs, Riyadh, Kingdom of Saudi Arabia
| | - Nasser Tawfeeq
- Department of Anesthesia, King Abdulaziz Medical City, National Guard Health Affairs, Riyadh, Kingdom of Saudi Arabia
| | - Freddie Wambi
- Department of Anesthesia, King Abdulaziz Medical City, National Guard Health Affairs, Riyadh, Kingdom of Saudi Arabia
| | - Nasir Mahmood
- Department of Anesthesia, King Abdulaziz Medical City, National Guard Health Affairs, Riyadh, Kingdom of Saudi Arabia
| | - Sonia Albrechtova
- Department of Anesthesia, King Abdulaziz Medical City, National Guard Health Affairs, Riyadh, Kingdom of Saudi Arabia
| | - Vassilios Dimitriou
- Department of Anesthesia, King Abdulaziz Medical City, National Guard Health Affairs, Riyadh, Kingdom of Saudi Arabia
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Affiliation(s)
- Anna Savoia
- a Institute for Maternal and Child Health - IRCCS Burlo Garofolo , Trieste , Italy.,b Department of Medical Sciences , University of Trieste , Trieste , Italy
| | - Daniela De Rocco
- a Institute for Maternal and Child Health - IRCCS Burlo Garofolo , Trieste , Italy
| | - Alessandro Pecci
- c Department of Internal Medicine , IRCCS Policlinico San Matteo Foundation and University of Pavia , Pavia , Italy
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Familial hematuria: A review. Medicina (B Aires) 2017; 53:1-10. [DOI: 10.1016/j.medici.2017.01.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2016] [Revised: 12/23/2016] [Accepted: 01/16/2017] [Indexed: 12/17/2022] Open
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Lecchi A, Femia EA, Paoletta S, Dupuis A, Ohlmann P, Gachet C, Jacobson KA, Machura K, Podda GM, Zieger B, Cattaneo M. Inherited dysfunctional platelet P2Y 12 receptor mutations associated with bleeding disorders. Hamostaseologie 2016; 36:279-283. [PMID: 27487748 DOI: 10.5482/hamo-16-03-0010] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Accepted: 07/20/2016] [Indexed: 11/05/2022] Open
Abstract
The platelet adenosine 5'-diphosphate (ADP) receptor P2Y12 (P2Y12R) plays a critical role in platelet aggregation. The present report illustrates an update of dysfunctional platelet P2Y12R mutations diagnosed with congenital lifelong bleeding problems. Described patients with heterozygous or homozygous substitution in the P2Y12R gene and qualitative abnormalities of the platelet P2Y12R are summarized. Recently, a further dysfunctional variant of P2Y12R has been identified in two brothers who presented with a lifelong severe bleeding disorder. During in vitro aggregation studies, the patient´s platelets show a markedly reduced and rapid reversible ADP-promoted aggregation. A homozygous c.561T>A substitution that changes the codon for His187 to Gln (p.His187Gln) in the P2Y12R gene has been identified. This mutation causes no change in receptor expression but decreases the affinity of the ligand for the receptor, even at high concentrations. Structure modelling studies indicated that the p.His187Gln mutation, located in the fifth transmembrane spanning domain (TM5), impairs conformational changes of the receptor. Structural integrity of the TM5 region is necessary for agonist and antagonist binding and for correct receptor function.
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Affiliation(s)
| | | | | | | | | | | | | | - Katharina Machura
- Katharina Machura, University Medical Center, Freiburg - Department of Pediatrics and Adolescent Medicine, Breisacher-Str. 66, 79106 Freiburg, Germany, Tel. +49/(0)761/27 06 37 10, E-mail:
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