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Liu C, Karabina A, Meller A, Bhattacharjee A, Agostino CJ, Bowman GR, Ruppel KM, Spudich JA, Leinwand LA. Homologous mutations in human β, embryonic, and perinatal muscle myosins have divergent effects on molecular power generation. Proc Natl Acad Sci U S A 2024; 121:e2315472121. [PMID: 38377203 PMCID: PMC10907259 DOI: 10.1073/pnas.2315472121] [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: 09/24/2023] [Accepted: 01/12/2024] [Indexed: 02/22/2024] Open
Abstract
Mutations at a highly conserved homologous residue in three closely related muscle myosins cause three distinct diseases involving muscle defects: R671C in β-cardiac myosin causes hypertrophic cardiomyopathy, R672C and R672H in embryonic skeletal myosin cause Freeman-Sheldon syndrome, and R674Q in perinatal skeletal myosin causes trismus-pseudocamptodactyly syndrome. It is not known whether their effects at the molecular level are similar to one another or correlate with disease phenotype and severity. To this end, we investigated the effects of the homologous mutations on key factors of molecular power production using recombinantly expressed human β, embryonic, and perinatal myosin subfragment-1. We found large effects in the developmental myosins but minimal effects in β myosin, and magnitude of changes correlated partially with clinical severity. The mutations in the developmental myosins dramatically decreased the step size and load-sensitive actin-detachment rate of single molecules measured by optical tweezers, in addition to decreasing overall enzymatic (ATPase) cycle rate. In contrast, the only measured effect of R671C in β myosin was a larger step size. Our measurements of step size and bound times predicted velocities consistent with those measured in an in vitro motility assay. Finally, molecular dynamics simulations predicted that the arginine to cysteine mutation in embryonic, but not β, myosin may reduce pre-powerstroke lever arm priming and ADP pocket opening, providing a possible structural mechanism consistent with the experimental observations. This paper presents direct comparisons of homologous mutations in several different myosin isoforms, whose divergent functional effects are a testament to myosin's highly allosteric nature.
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Affiliation(s)
- Chao Liu
- Department of Biochemistry, Stanford University School of Medicine, Stanford, CA94305
- Stanford Cardiovascular Institute, Stanford University School of Medicine, Stanford, CA94305
- Biosciences and Biotechnology Division, Lawrence Livermore National Laboratory, Livermore, CA94550
| | - Anastasia Karabina
- BioFrontiers Institute, University of Colorado Boulder, Boulder, CO80309
- Department of Molecular, Cellular, and Developmental Biology, University of Colorado Boulder, Boulder, CO80309
- Kainomyx, Inc., Palo Alto, CA94304
| | - Artur Meller
- Department of Biochemistry and Biophysics, Washington University in St. Louis, St. Louis, MO63110
- Medical Scientist Training Program, Washington University in St. Louis, St. Louis, MO63110
| | - Ayan Bhattacharjee
- Department of Biochemistry and Biophysics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA19104
| | - Colby J. Agostino
- Department of Biochemistry and Biophysics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA19104
| | - Greg R. Bowman
- Department of Biochemistry and Biophysics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA19104
| | - Kathleen M. Ruppel
- Department of Biochemistry, Stanford University School of Medicine, Stanford, CA94305
- Stanford Cardiovascular Institute, Stanford University School of Medicine, Stanford, CA94305
- Kainomyx, Inc., Palo Alto, CA94304
| | - James A. Spudich
- Department of Biochemistry, Stanford University School of Medicine, Stanford, CA94305
- Stanford Cardiovascular Institute, Stanford University School of Medicine, Stanford, CA94305
- Kainomyx, Inc., Palo Alto, CA94304
| | - Leslie A. Leinwand
- BioFrontiers Institute, University of Colorado Boulder, Boulder, CO80309
- Department of Molecular, Cellular, and Developmental Biology, University of Colorado Boulder, Boulder, CO80309
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Wang XQ, Yuan F, Yu BR. Whole-Exome Sequencing Reveals Mutational Signature of Hypertrophic Cardiomyopathy. Int J Gen Med 2023; 16:4617-4628. [PMID: 37850193 PMCID: PMC10577257 DOI: 10.2147/ijgm.s422598] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Accepted: 09/21/2023] [Indexed: 10/19/2023] Open
Abstract
Background Hypertrophic cardiomyopathy (HCM) is an extremely insidious and lethal disease caused by genetic variation. It has been studied for nearly 70 years since its discovery, but its cause of the disease remains a mystery. This study is aimed to explore the genetic pathogenesis of HCM in order to provide new insight for the diagnosis and treatment of HCM. Methods Patients with HCM at 4 hospitals from January 1, 2020, to December 31, 2021, were collected. Peripheral blood of these patients was collected for whole exome sequencing. Moreover, data on the HCM transcriptome were analyzed in the GEO database. Results Totally, 14 patients were enrolled, and 6 single-nucleotide variation (SNV) mutant genes represented by MUC12 were observed. Most of the gene mutations in HCM patients were synonymous and non-synonymous, and the types of base mutations were mainly C > T and G > A. Copy number variants (CNVs) predominantly occurred on chromosome 1 in HCM patients. Furthermore, we found that the only ATP2A2 gene was differentially expressed in 3 groups of transcriptome data in GEO database, and the presence of ATP2A2 mutation in 10 samples was observed in this study. Conclusion In summary, 7 mutated genes represented by MUC12 and ATP2A2 were found in this study, which may provide novel insights into the pathogenic mechanism of HCM.
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Affiliation(s)
- Xi-Qin Wang
- Department of Internal Medicine, Yuhua Yunfang Integrated Traditional Chinese and Western Medicine Clinic, Shijiazhuang, Hebei, 050023, People’s Republic of China
| | - Fang Yuan
- Department of Cardiovascular Medicine, Fuwai Central China Cardiovascular Hospital, Zhengzhou, Henan, 450000, People’s Republic of China
| | - Bao-Rui Yu
- Department of Cardiovascular Medicine, Fuwai Central China Cardiovascular Hospital, Zhengzhou, Henan, 450000, People’s Republic of China
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Marchione G, Pilotto E, Midena G. Proptosis secondary to bilateral extraocular muscle enlargement in Noonan syndrome with hypertrophic cardiomyopathy: A case report. Eur J Ophthalmol 2023; 33:NP67-NP70. [PMID: 36065573 DOI: 10.1177/11206721221125035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
PURPOSE To report and investigate proptosis in a young girl with Noonan syndrome. METHODS Observational case report. RESULTS A 16-year-old girl affected by Noonan syndrome underwent a complete ophthalmological examination showing bilateral proptosis with hypofunction of lateral rectus and superior oblique muscles. Visual acuity, color discrimination and fundus examination were unremarkable. The orbital MRI showed bilateral proptosis and symmetrical enlargement of extraocular muscles, with bellies thickening and tendon sparing. The young patient also complained restrictive hypertrophic cardiomyopathy. CONCLUSIONS Proptosis is an uncommon ocular manifestation of Noonan syndrome and its pathophysiology has never been clarified. The MRI evidence of extraocular muscles enlargement associated with hypertrophic cardiomyopathy, led us to hypothesize a common altered pathway beneath these features, more specifically the MAP kinase pathway, since extraocular and cardiac muscles share a mesenchymal embryological origin.
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Affiliation(s)
- Giulia Marchione
- Department of Ophthalmology, University of Padova, Padova, Italy
| | - Elisabetta Pilotto
- Department of Ophthalmology, University of Padova, Padova, Italy
- Padova University Hospital ERN-EYE Center, Padova, Italy
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Liu C, Karabina A, Meller A, Bhattacharjee A, Agostino CJ, Bowman GR, Ruppel KM, Spudich JA, Leinwand LA. Homologous mutations in β, embryonic, and perinatal muscle myosins have divergent effects on molecular power generation. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.07.02.547385. [PMID: 37425764 PMCID: PMC10327197 DOI: 10.1101/2023.07.02.547385] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/11/2023]
Abstract
Mutations at a highly conserved homologous residue in three closely related muscle myosins cause three distinct diseases involving muscle defects: R671C in β -cardiac myosin causes hypertrophic cardiomyopathy, R672C and R672H in embryonic skeletal myosin cause Freeman Sheldon syndrome, and R674Q in perinatal skeletal myosin causes trismus-pseudocamptodactyly syndrome. It is not known if their effects at the molecular level are similar to one another or correlate with disease phenotype and severity. To this end, we investigated the effects of the homologous mutations on key factors of molecular power production using recombinantly expressed human β , embryonic, and perinatal myosin subfragment-1. We found large effects in the developmental myosins, with the most dramatic in perinatal, but minimal effects in β myosin, and magnitude of changes correlated partially with clinical severity. The mutations in the developmental myosins dramatically decreased the step size and load-sensitive actin-detachment rate of single molecules measured by optical tweezers, in addition to decreasing ATPase cycle rate. In contrast, the only measured effect of R671C in β myosin was a larger step size. Our measurements of step size and bound times predicted velocities consistent with those measured in an in vitro motility assay. Finally, molecular dynamics simulations predicted that the arginine to cysteine mutation in embryonic, but not β , myosin may reduce pre-powerstroke lever arm priming and ADP pocket opening, providing a possible structural mechanism consistent with the experimental observations. This paper presents the first direct comparisons of homologous mutations in several different myosin isoforms, whose divergent functional effects are yet another testament to myosin's highly allosteric nature.
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Affiliation(s)
- Chao Liu
- Department of Biochemistry, Stanford University School of Medicine, Stanford, CA 94305
- Stanford Cardiovascular Institute, Stanford University School of Medicine, Stanford, CA 94305
- Biosciences and Biotechnology Division, Lawrence Livermore National Laboratory, Livermore, CA 94550
| | - Anastasia Karabina
- BioFrontiers Institute, University of Colorado Boulder, Boulder, CO 80303
- Department of Molecular, Cellular, and Developmental Biology, University of Colorado Boulder, Boulder, CO 80303
- Kainomyx, Inc., Palo Alto, CA 94304
| | - Artur Meller
- Department of Biochemistry and Biophysics, Washington University in St. Louis, St. Louis, MO 63110
- Medical Scientist Training Program, Washington University in St. Louis, St. Louis, MO 63110
| | - Ayan Bhattacharjee
- Department of Biochemistry and Biophysics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104
| | - Colby J Agostino
- Department of Biochemistry and Biophysics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104
| | - Greg R Bowman
- Department of Biochemistry and Biophysics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104
| | - Kathleen M Ruppel
- Department of Biochemistry, Stanford University School of Medicine, Stanford, CA 94305
- Stanford Cardiovascular Institute, Stanford University School of Medicine, Stanford, CA 94305
- Kainomyx, Inc., Palo Alto, CA 94304
| | - James A Spudich
- Department of Biochemistry, Stanford University School of Medicine, Stanford, CA 94305
- Stanford Cardiovascular Institute, Stanford University School of Medicine, Stanford, CA 94305
- Kainomyx, Inc., Palo Alto, CA 94304
| | - Leslie A Leinwand
- BioFrontiers Institute, University of Colorado Boulder, Boulder, CO 80303
- Department of Molecular, Cellular, and Developmental Biology, University of Colorado Boulder, Boulder, CO 80303
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Sun B, Kekenes-Huskey PM. Myofilament-associated proteins with intrinsic disorder (MAPIDs) and their resolution by computational modeling. Q Rev Biophys 2023; 56:e2. [PMID: 36628457 PMCID: PMC11070111 DOI: 10.1017/s003358352300001x] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
The cardiac sarcomere is a cellular structure in the heart that enables muscle cells to contract. Dozens of proteins belong to the cardiac sarcomere, which work in tandem to generate force and adapt to demands on cardiac output. Intriguingly, the majority of these proteins have significant intrinsic disorder that contributes to their functions, yet the biophysics of these intrinsically disordered regions (IDRs) have been characterized in limited detail. In this review, we first enumerate these myofilament-associated proteins with intrinsic disorder (MAPIDs) and recent biophysical studies to characterize their IDRs. We secondly summarize the biophysics governing IDR properties and the state-of-the-art in computational tools toward MAPID identification and characterization of their conformation ensembles. We conclude with an overview of future computational approaches toward broadening the understanding of intrinsic disorder in the cardiac sarcomere.
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Affiliation(s)
- Bin Sun
- Research Center for Pharmacoinformatics (The State-Province Key Laboratories of Biomedicine-Pharmaceutics of China), Department of Medicinal Chemistry and Natural Medicine Chemistry, College of Pharmacy, Harbin Medical University, Harbin 150081, China
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Yu S, Sun L, Jiang J, He X, Zhou Q. Common variants in AGR1 genes contributed to the risk and traits of cirrhotic cardiomyopathy in Han Chinese population. Biomark Med 2022; 16:331-340. [PMID: 35234520 DOI: 10.2217/bmm-2021-0744] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Aim: This study aimed to determine the association between polymorphisms of the ARG1 gene and the risk and traits of cirrhotic cardiomyopathy (CCM). Methods: A total of 468 CCM and 1012 cirrhosis patients were enrolled, and 12 single-nucleotide polymorphisms (SNPs) in the ARG1 gene were genotyped. Differences in genotype, allele and haplotype frequencies of the SNPs between the CCM and cirrhosis groups were analyzed by chi-square test. Correlations of the genotypes of SNPs and representative traits of liver and heart function were performed using linear regression analysis. Results: SNPs rs2781666 and rs2781667 were associated with the risk of CCM in both dominant and additive inheritance models. The GG genotype frequency of rs2781666 and CC genotype frequency of rs2781667 were lower in the CCM group than in the cirrhosis group. The G-C haplotype frequency of the block consisting of rs2781666 and rs2781667 was higher and the T-T haplotype frequency was lower in CCM patients than in cirrhosis patients. SNP rs2781666 was associated with the alanine transaminase level, and rs2781667 was associated with the ARG1 level and left atrial diameter. Conclusion: SNPs rs2781666 and rs2781667 in the ARG1 gene were associated with susceptibility to and traits of CCM in the Han Chinese population.
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Affiliation(s)
- Shanshan Yu
- Department of Ultrasound, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, 710004, China
| | - Lei Sun
- Department of Ultrasound, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, 710004, China
| | - Jue Jiang
- Department of Ultrasound, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, 710004, China
| | - Xin He
- Department of Ultrasound, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, 710004, China
| | - Qi Zhou
- Department of Ultrasound, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, 710004, China
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