Distrofia muscolare di Duchenne da duplicazione dell’esone 2: caratterizzazione e identificazione di fattori predittivi e prognostici
- 2.9 Anni 2022/2025
- 193.600€ Totale Fondi
La distrofia muscolare di Duchenne (DMD) è una malattia legata al cromosoma X caratterizzata dal progressivo deterioramento dei muscoli scheletrici e respiratori, oltre che del cuore. In genere, la capacità di camminare autonomamente si perde tra i 10 e 14 anni. Il gene responsabile della DMD, quando difettoso, è quello della distrofina, che può presentare diversi tipi di mutazioni che portano alla mancata produzione di questa proteina. Ad oggi le terapie più promettenti sono quelle “mutazione-specifiche”, disegnate cioè in modo da correggere in modo mirato ogni singola mutazione. È importante sottolineare che non tutti i pazienti presentano la stessa evoluzione clinica: studi recenti hanno dimostrato come questa variabilità nella manifestazione della malattia (fenotipo) possa dipendere anche dal profilo genetico del paziente (genotipo). È quindi fondamentale raccogliere maggiori informazioni riguardo alla correlazione tra il genotipo e il fenotipo e capire se la progressione della malattia vari in base a mutazioni differenti. Ci concentreremo su una particolare mutazione, la duplicazione dell’esone 2 (Dup2), che consiste nella ripetizione della seconda tra le porzioni del gene che vengono effettivamente tradotte nella proteina (esone). Oltre a essere la duplicazione più comune responsabile di DMD, questa è anche l’unica per la quale attualmente sia in corso uno studio clinico di fase I/IIa su pazienti. Per le sue caratteristiche, e in linea con quando descritto fino ad oggi, la Dup2 è sempre stata associata a un fenotipo classico della DMD. Tuttavia, sono stati riportati casi di pazienti che pur avendo questa mutazione presentavano un decorso migliore, per esempio mantenendo la capacità di camminare anche dopo i 13 anni di età. Dopo aver identificato tutti i pazienti con questa mutazione seguiti in centri di terzo livello in Italia, abbiamo condotto degli studi preliminari che mostrano come una percentuale non trascurabile di loro abbia un fenotipo più lieve, non spiegabile in base alle conoscenze attuali. Obiettivo di questo progetto sarà quindi approfondire la caratterizzazione clinica dei pazienti con la mutazione Dup2 e chiarire i meccanismi molecolari alla base di questo fenotipo attenuato della malattia, grazie ai campioni biologici raccolti dai pazienti selezionati.
Pubblicazioni Scientifiche
- 2017 Neuromuscular disorders : NMD
Diagnosis of Duchenne Muscular Dystrophy in Italy in the last decade: Critical issues and areas for improvements.
- 2019 ANNALS OF NEUROLOGY
A multicenter retrospective study of charcot-marie-tooth disease type 4B (CMT4B) associated with mutations in myotubularin-related proteins (MTMRs).
- 2019 Journal of neurology, neurosurgery, and psychiatry
Expanding the spectrum of genes responsible for hereditary motor neuropathies.
- 2020 ANNALS OF CLINICAL AND TRANSLATIONAL NEUROLOGY
Genetic modifiers of respiratory function in Duchenne muscular dystrophy.
- 2020 PHARMACOLOGICAL RESEARCH
Rimeporide as a first- in-class NHE-1 inhibitor: Results of a phase Ib trial in young patients with Duchenne Muscular Dystrophy.
- 2019 MUSCLE & NERVE
Expanding the central nervous system disease spectrum associated with FLNC mutation.
- 2016 EMBO MOLECULAR MEDICINE
Niacin-mediated Tace activation ameliorates CMT neuropathies with focal hypermyelination
- 2014 JOURNAL OF EXPERIMENTAL MEDICINE
Jab1 regulates Schwann cell proliferation and axonal sorting through p27
- 2012 DEVELOPMENT
Vimentin regulates peripheral nerve myelination
- 2020 NEUROLOGY
Pregnancy in Charcot-Marie-Tooth disease: Data from the Italian CMT national registry.
- 2020 Journal of neurology, neurosurgery, and psychiatry
Nusinersen safety and effects on motor function in adult spinal muscular atrophy type 2 and 3.
- 2021 JOURNAL OF NEUROLOGY
A 5-year clinical follow-up study from the Italian National Registry for FSHD.
- 2020 FRONTIERS IN MOLECULAR NEUROSCIENCE
LAMA2 Neuropathies: Human Findings and Pathomechanisms From Mouse Models.
- 2020 HUMAN MOLECULAR GENETICS
Impaired turnover of hyperfused mitochondria in severe axonal neuropathy due to a novel DRP1 mutation.
- 2019 Annals of internal medicine
Cardiac and Neuromuscular Features of Patients With LMNA-Related Cardiomyopathy.
- 2019 PLOS ONE
Correction: Long-term natural history data in Duchenne muscular dystrophy ambulant patients with mutations amenable to skip exons 44, 45, 51 and 53.
- 2020 FRONTIERS IN GENETICS
The Genetic Landscape of Dystrophin Mutations in Italy: A Nationwide Study.
- 2016 AMERICAN JOURNAL OF HUMAN GENETICS
Association Study of Exon Variants in the NF-?B and TGFß Pathways Identifies CD40 as a Modifier of Duchenne Muscular Dystrophy.
- 2017 NATURE COMMUNICATIONS
Evidence for ACTN3 as a genetic modifier of Duchenne muscular dystrophy.
- 2019 PLOS ONE
Long-term natural history data in Duchenne muscular dystrophy ambulant patients with mutations amenable to skip exons 44, 45, 51 and 53.
- 2017 Contemporary clinical trials
Developing standardized corticosteroid treatment for Duchenne muscular dystrophy.
- 2017 Neuromuscular disorders : NMD
Diagnosis of Duchenne muscular dystrophy in Italy in the last decade: Critical issues and areas for improvements.
- 2020 Journal of clinical medicine
Duchenne Dilated Cardiomyopathy: Cardiac Management from Prevention to Advanced Cardiovascular Therapies.
- 2018 PLOS ONE
Implicit learning deficit in children with Duchenne muscular dystrophy: Evidence for a cerebellar cognitive impairment?
- 2019 Neuromuscular disorders : NMD
Longitudinal natural history in young boys with Duchenne muscular dystrophy.
- 2018 NEUROLOGY
The relationship between deficit in digit span and genotype in nonsense mutation Duchenne muscular dystrophy.
- 2019 Neuromuscular disorders : NMD
Evaluation of gait in Duchenne Muscular Dystrophy: Relation of 3D gait analysis to clinical assessment.
- 2018 PLOS ONE
Upper limb function in Duchenne muscular dystrophy: 24 month longitudinal data.
- 2016 Neuromuscular disorders : NMD
Histological effects of givinostat in boys with Duchenne muscular dystrophy.
- 2014 PLOS ONE
6 Minute walk test in Duchenne MD patients with different mutations: 12 month changes.
- 2012 Molecular therapy : the journal of the American Society of Gene Therapy
Exon 45 skipping through U1-snRNA antisense molecules recovers the Dys-nNOS pathway and muscle differentiation in human DMD myoblasts.
- 2016 NEUROMUSCULAR DISORDERS
Health-related quality of life and functional changes in DMD: A 12-month longitudinal cohort study
- 2012 BMC MEDICAL GENETICS
Genetic characterization in symptomatic female DMD carriers: lack of relationship between X-inactivation, transcriptional DMD allele balancing and phenotype.
- 2007 FASEB journal : official publication of the Federation of American Societies for Experimental Biology
Gene expression profiling in the early phases of DMD: a constant molecular signature characterizes DMD muscle from early postnatal life throughout disease progression.
- 2015 Neuromuscular disorders : NMD
Benefits of glucocorticoids in non-ambulant boys/men with Duchenne muscular dystrophy: A multicentric longitudinal study using the Performance of Upper Limb test.
- 2014 Neuromuscular disorders : NMD
Reliability of the Performance of Upper Limb assessment in Duchenne muscular dystrophy.
- 2017 HUMAN MOLECULAR GENETICS
Oxidative stress in Duchenne muscular dystrophy: focus on the NRF2 redox pathway.
- 2010 Neuromuscular disorders : NMD
North Star Ambulatory Assessment, 6-minute walk test and timed items in ambulant boys with Duchenne muscular dystrophy.
- 2009 Neuromuscular disorders : NMD
Reliability of the North Star Ambulatory Assessment in a multicentric setting.
- 2021 Brain Sciences
A Phase 1/2 Study of Flavocoxid, an Oral NF-?B Inhibitor, in Duchenne Muscular Dystrophy.
- 2020 ORPHANET JOURNAL OF RARE DISEASES
Global epidemiology of Duchenne muscular dystrophy: an updated systematic review and meta-analysis.
- 2020 NEUROLOGY
Suitability of external controls for drug evaluation in Duchenne muscular dystrophy.
- 2020 Acta myologica : myopathies and cardiomyopathies : official journal of the Mediterranean Society of Myology
Impaired myocardial strain in early stage of Duchenne muscular dystrophy: its relation with age and motor performance.
- 2021 Neuromuscular disorders : NMD
The nonsense mutation stop+4 model correlates with motor changes in Duchenne muscular dystrophy.
- 2015 NEUROMUSCULAR DISORDERS
Benefits of glucocorticoids in non-ambulant boys/men with Duchenne muscular dystrophy: A multicentric longitudinal study using the Performance of Upper Limb test
- 2018 Neuromuscular disorders : NMD
226th ENMC International Workshop:: Towards validated and qualified biomarkers for therapy development for Duchenne muscular dystrophy 20-22 January 2017, Heemskerk, The Netherlands.
- 2018 PLOS ONE
A multicenter comparison of quantification methods for antisense oligonucleotide-induced DMD exon 51 skipping in Duchenne muscular dystrophy cell cultures.
- 2021 HUMAN MUTATION
A single NGS-based assay covering the entire genomic sequence of the DMD gene facilitates diagnostic and newborn screening confirmatory testing.
- 2020 Journal of neuromuscular diseases
Clinical Phenotypes of DMD Exon 51 Skip Equivalent Deletions: A Systematic Review.
- 2019 JCI insight
A recurrent COL6A1 pseudoexon insertion causes muscular dystrophy and is effectively targeted by splice-correction therapies.
- 2021 Science (New York, N.Y.)
RNA-targeted drugs for neuromuscular diseases.
- 2021 Neurology. Genetics
Ethnicity-related DMD Genotype Landscapes in European and Non-European Countries.
- 2020 European journal of human genetics : EJHG
EMQN best practice guidelines for genetic testing in dystrophinopathies.
- 2014 JAMA NEUROLOGY
Biochemical characterization of patients with in-frame or out-of-frame DMD deletions pertinent to exon 44 or 45 skipping.
- 2020 PLOS ONE
Genetic testing offer for inherited neuromuscular diseases within the EURO-NMD reference network: A European survey study.
- 2012 NEUROLOGY
Importance of SPP1 genotype as a covariate in clinical trials in Duchenne muscular dystrophy
- 2014 PLOS ONE
6 Minute Walk Test in Duchenne MD Patients with Different Mutations: 12 Month Changes
- 2020 ANNALS OF CLINICAL AND TRANSLATIONAL NEUROLOGY
Genetic modifiers of respiratory function in Duchenne muscular dystrophy
- 2014 PLOS ONE
Long term natural history data in ambulant boys with duchenne muscular dystrophy: 36-month changes
- 2011 BMC MEDICAL GENETICS
Clinical and molecular characterization of a cohort of patients with novel nucleotide alterations of the Dystrophin gene detected by direct sequencing
- 2011 JOURNAL OF NEUROLOGY
Genotype and phenotype characterization in a large dystrophinopathic cohort with extended follow-up
- 2006 FASEB journal : official publication of the Federation of American Societies for Experimental Biology
A region in the dystrophin gene major hot spot harbors a cluster of deletion breakpoints and generates double-strand breaks in yeast.
- 2001 HUMAN MUTATION
A novel splice site mutation (3157+1G>T) in the dystrophin gene causing total exon skipping and DMD phenotype.
- 2001 HUMAN GENETICS
Analysis of splicing parameters in the dystrophin gene: relevance for physiological and pathogenetic splicing mechanisms.
- 2011 BMC MEDICAL GENETICS
Clinical and molecular characterization of a cohort of patients with novel nucleotide alterations of the Dystrophin gene detected by direct sequencing.
- 1995 HUMAN MOLECULAR GENETICS
A G+1-->A transversion at the 5' splice site of intron 69 of the dystrophin gene causing the absence of peripheral nerve Dp116 and severe clinical involvement in a DMD patient.
- 2002 Genetics
Comparative analysis of the human dystrophin and utrophin gene structures.
- 1995 Neuromuscular disorders : NMD
Duplication of dystrophin gene and dissimilar clinical phenotype in the same family.
- 2000 NEUROLOGY
Loss of Dp140 dystrophin isoform and intellectual impairment in Duchenne dystrophy.
- 1994 Neuromuscular disorders : NMD
Mutation of dystrophin gene and cardiomyopathy.
- 2003 HUMAN GENETICS
Relevance of sequence and structure elements for deletion events in the dystrophin gene major hot-spot.
- 2002 FEBS LETTERS
The dystrophin gene is alternatively spliced throughout its coding sequence.
- 2001 JOURNAL OF THE NEUROLOGICAL SCIENCES
Transcriptional activation of the non-muscle, full-length dystrophin isoforms in Duchenne muscular dystrophy skeletal muscle.
- 2003 Neuromuscular disorders : NMD
Two dystrophin proteins and transcripts in a mild dystrophinopathic patient.
- 1999 Lancet (London, England)
Absence of brain Dp140 isoform and cognitive impairment in Becker muscular dystrophy.