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Miopatia miofibrilar
ORPHA:593CID-10 · G71.8CID-11 · 8C76DOENÇA RARA
Esta doença tem causa genética. Recomendamos procurar um médico geneticista para diagnóstico, exames genéticos e aconselhamento familiar.
MuscularInício adultaHerança AD/AR
Também conhecida comoMFMMMF
Sinônimos clínicos: MFM

A miopatia miofibrilar (MMF) descreve um grupo de doenças que afetam os músculos esqueléticos (os que usamos para nos mover) e o músculo cardíaco (o coração). Ela é caracterizada pela desorganização das miofibrilas (estruturas internas dos músculos) e pelo acúmulo de resíduos (produtos de degradação) em forma de depósitos dentro das células musculares. Clinicamente, a MMF geralmente se manifesta com uma fraqueza muscular que piora lentamente. Essa fraqueza começa nos músculos mais distantes do centro do corpo (como os das mãos e pés). No entanto, a doença é muito variável e, em alguns pacientes, pode também afetar os músculos mais próximos do centro (como os do tronco, ombros e coxas), além dos músculos do coração e os envolvidos na respiração.

Última verificação: Fonte: sem afirmação sobre o SUS a verificarEm construçãohistóricoSugerir correção
Mantido por Agente Raras·Colaborar como especialista →

Introdução

O que você precisa saber de cara

💬
EM LINGUAGEM SIMPLES

A miopatia miofibrilar é uma doença rara dos músculos e do coração que geralmente começa a se manifestar na idade adulta. As pessoas afetadas costumam sentir uma fraqueza que avança devagar, atingindo primeiro partes distantes como mãos e pés, além de poder atingir a respiração e a função cardíaca. A condição tem causas genéticas que podem passar de pais para filhos ou ocorrer de forma hereditária recessiva. No Brasil, ela não possui um protocolo clínico específico (PCDT) nem remédios próprios dispensados pelo SUS, sendo acompanhada pela rede de saúde de forma geral.

📋
Informacoes curadas por IA — podem conter imprecisoes

A miopatia miofibrilar (MMF) descreve um grupo de doenças que afetam os músculos esqueléticos (os que usamos para nos mover) e o músculo cardíaco (o coração). Ela é caracterizada pela desorganização das miofibrilas (estruturas internas dos músculos) e pelo acúmulo de resíduos (produtos de degradação) em forma de depósitos dentro das células musculares. Clinicamente, a MMF geralmente se manifesta com uma fraqueza muscular que piora lentamente. Essa fraqueza começa nos músculos mais distantes do centro do corpo (como os das mãos e pés). No entanto, a doença é muito variável e, em alguns pacientes, pode também afetar os músculos mais próximos do centro (como os do tronco, ombros e coxas), além dos músculos do coração e os envolvidos na respiração.

Pesquisas ativas
1 ensaio
1 total registrados no ClinicalTrials.gov
Publicações científicas
339 artigos
Último publicado: 2026 Apr 11

Escala de raridade

CLASSIFICAÇÃO ORPHANET · BRASIL 2024
Unknown
Ultra-rara
<1/50k
Muito rara
1/20k
Rara
1/10k
Pouco freq.
1/5k
Incomum
1/2k
Prevalência
0.0
Worldwide
Início
Adult
🏥
SUS: Sem cobertura SUSScore: 0%
CID-10: G71.8
Você se identifica com essa condição?
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Entender a doença

Do básico ao detalhe, leia no seu ritmo

Preparando trilha educativa...

Sinais e sintomas

O que aparece no corpo e com que frequência cada sintoma acontece

Partes do corpo afetadas

💪
Músculos
67 sintomas
❤️
Coração
26 sintomas
🦴
Ossos e articulações
19 sintomas
🧠
Neurológico
14 sintomas
😀
Face
9 sintomas
🫁
Pulmão
7 sintomas

+ 87 sintomas em outras categorias

Características mais comuns

—
Infecções recorrentes do trato respiratório inferior
—
Creatina quinase extremamente elevada
—
Dor nas costas
—
Anormalidade do músculo mastigatório
—
Disfunção diastólica do ventrículo esquerdo
—
Bloqueio do ramo direito
245sintomas
Sem dados (245)

Os sintomas variam de pessoa para pessoa. Abaixo estão as 245 características clínicas mais associadas, ordenadas por frequência.

Infecções recorrentes do trato respiratório inferiorRecurrent lower respiratory tract infections
Creatina quinase extremamente elevadaExtremely elevated creatine kinase
Anormalidade do músculo mastigatórioAbnormality of masticatory muscle
Disfunção diastólica do ventrículo esquerdoLeft ventricular diastolic dysfunction

Linha do tempo da pesquisa

Publicações por ano — veja quando o interesse científico cresceu
Anos de pesquisa1desde 2026
Total histórico339PubMed
Últimos 10 anos200publicações
Pico202529 papers
Linha do tempo
2026Hoje · 2026🧪 2025Primeiro ensaio clínico📈 2025Ano de pico
Publicações por ano (últimos 10 anos)

Encontrou um erro ou informação desatualizada? Sugira uma correção →

Genética e causas

O que está alterado no DNA e como passa nas famílias

Genes associados

13 genes identificados com associação a esta condição. Padrão de herança: Autosomal dominant, Autosomal recessive.

Curadoria gene-doença

fontes oficiais
BAG3 FLNC
FLNC BAG3
MYL2Myosin regulatory light chain 2, ventricular/cardiac muscle isoformDisease-causing germline mutation(s) inTolerante
VIAS BIOLÓGICAS (1)
Striated Muscle Contraction
MECANISMO DE DOENÇA

Cardiomyopathy, familial hypertrophic, 10

A hereditary heart disorder characterized by ventricular hypertrophy, which is usually asymmetric and often involves the interventricular septum. The symptoms include dyspnea, syncope, collapse, palpitations, and chest pain. They can be readily provoked by exercise. The disorder has inter- and intrafamilial variability ranging from benign to malignant forms with high risk of cardiac failure and sudden cardiac death. Rarely, patients present a variant of familial hypertrophic cardiomyopathy, characterized by mid-left ventricular chamber thickening.

EXPRESSÃO TECIDUAL(Ubíquo)
Coração - Ventrículo esquerdo
14495.3 TPM
Músculo esquelético
12092.5 TPM
Coração - Átrio
47.1 TPM
Glândula salivar
7.8 TPM
Aorta
7.4 TPM
OUTRAS DOENÇAS (4)
myopathy, myofibrillar, 12, infantile-onset, with cardiomyopathyhypertrophic cardiomyopathy 10hypertrophic cardiomyopathycongenital fiber-type disproportion myopathy
HGNC:7583UniProt:P10916
RYR1Ryanodine receptor 1Disease-causing germline mutation(s) inTolerante
VIAS BIOLÓGICAS (2)
Ion homeostasisStimuli-sensing channels
MECANISMO DE DOENÇA

Malignant hyperthermia 1

Autosomal dominant pharmacogenetic disorder of skeletal muscle and is one of the main causes of death due to anesthesia. In susceptible people, an MH episode can be triggered by all commonly used inhalational anesthetics such as halothane and by depolarizing muscle relaxants such as succinylcholine. The clinical features of the myopathy are hyperthermia, accelerated muscle metabolism, contractures, metabolic acidosis, tachycardia and death, if not treated with the postsynaptic muscle relaxant, dantrolene. Susceptibility to MH can be determined with the 'in vitro' contracture test (IVCT): observing the magnitude of contractures induced in strips of muscle tissue by caffeine alone and halothane alone. Patients with normal response are MH normal (MHN), those with abnormal response to caffeine alone or halothane alone are MH equivocal (MHE(C) and MHE(H) respectively).

EXPRESSÃO TECIDUAL(Tecido-específico)
Músculo esquelético
423.5 TPM
Cerebelo
21.3 TPM
Cérebro - Hemisfério cerebelar
15.4 TPM
Hipotálamo
13.6 TPM
Testículo
8.7 TPM
OUTRAS DOENÇAS (13)
King-Denborough syndromecongenital multicore myopathy with external ophthalmoplegiacentral core myopathymalignant hyperthermia, susceptibility to, 1
HGNC:10483UniProt:P21817
MYOTMyotilinDisease-causing germline mutation(s) inTolerante
MECANISMO DE DOENÇA

Myopathy, myofibrillar, 3

A form of myofibrillar myopathy, a group of chronic neuromuscular disorders characterized at ultrastructural level by disintegration of the sarcomeric Z disk and myofibrils, and replacement of the normal myofibrillar markings by small dense granules, or larger hyaline masses, or amorphous material. MFM3 is characterized by progressive skeletal muscle weakness greater distally than proximally, tight heel cords, hyporeflexia, cardiomyopathy and peripheral neuropathy in some patients. Affected muscle exhibits disorganization and streaming of the Z-line, presence of large hyaline structures, excessive accumulation of myotilin and other ectopically expressed proteins and prominent congophilic deposits.

EXPRESSÃO TECIDUAL(Ubíquo)
Músculo esquelético
602.6 TPM
Nervo tibial
12.9 TPM
Cólon sigmoide
10.7 TPM
Cervix Ectocervix
9.3 TPM
Esôfago - Muscular
9.1 TPM
OUTRAS DOENÇAS (1)
myofibrillar myopathy 3
HGNC:12399UniProt:Q9UBF9
PYROXD1tRNA ligase complex-associated NAD(P)H dehydrogenase PYROXD1Disease-causing germline mutation(s) inTolerante
MECANISMO DE DOENÇA

Myopathy, myofibrillar, 8

A form of myofibrillar myopathy, a group of chronic neuromuscular disorders characterized at ultrastructural level by disintegration of the sarcomeric Z disk and myofibrils, and replacement of the normal myofibrillar markings by small dense granules, or larger hyaline masses, or amorphous material. MFM8 is an autosomal recessive form, clinically characterized by slowly progressive symmetrical weakness affecting both proximal and distal muscles, with normal to moderately elevated creatine kinase. Mild facial weakness, a high palate, nasal speech, and swallowing difficulties are typical features, mild restrictive lung disease is common, and late-onset cardiac involvement may be present.

EXPRESSÃO TECIDUAL(Ubíquo)
Testículo
13.6 TPM
Linfócitos
13.2 TPM
Fibroblastos
10.8 TPM
Tireoide
10.3 TPM
Artéria tibial
10.3 TPM
INTERAÇÕES PROTEICAS (1)
OUTRAS DOENÇAS (1)
myofibrillar myopathy 8
HGNC:HGNC:26162UniProt:Q8WU10
SVILSupervillinDisease-causing germline mutation(s) inRestrito
MECANISMO DE DOENÇA

Myopathy, myofibrillar, 10

A form of myofibrillar myopathy, a group of chronic neuromuscular disorders characterized at ultrastructural level by disintegration of the sarcomeric Z disk and myofibrils, and replacement of the normal myofibrillar markings by small dense granules, or larger hyaline masses, or amorphous material. MFM10 is an autosomal recessive disorder characterized by muscle pain, cramping, exercise fatigue, and progressive muscle rigidity.

EXPRESSÃO TECIDUAL(Ubíquo)
Músculo esquelético
436.1 TPM
Cólon sigmoide
406.9 TPM
Esôfago - Muscular
284.3 TPM
Esôfago - Junção
245.0 TPM
Aorta
187.6 TPM
INTERAÇÕES PROTEICAS (3)
OUTRAS DOENÇAS (1)
myofibrillar myopathy 10
HGNC:HGNC:11480UniProt:O95425
LDB3LIM domain-binding protein 3Disease-causing germline mutation(s) inTolerante
MECANISMO DE DOENÇA

Cardiomyopathy, dilated, 1C, with or without left ventricular non-compaction

A disorder characterized by ventricular dilation and impaired systolic function, resulting in congestive heart failure and arrhythmia. Patients are at risk of premature death. Cardiomyopathy dilated type 1C is associated with left ventricular non-compaction in some patients. Left ventricular non-compaction is characterized by numerous prominent trabeculations and deep intertrabecular recesses in hypertrophied and hypokinetic segments of the left ventricle.

EXPRESSÃO TECIDUAL(Ubíquo)
Coração - Ventrículo esquerdo
372.3 TPM
Músculo esquelético
338.8 TPM
Coração - Átrio
299.7 TPM
Artéria tibial
89.9 TPM
Aorta
57.8 TPM
OUTRAS DOENÇAS (7)
myofibrillar myopathy 4dilated cardiomyopathy 1Cfamilial isolated arrhythmogenic ventricular dysplasia, left dominant formfamilial isolated arrhythmogenic ventricular dysplasia, biventricular form
HGNC:15710UniProt:O75112
KYKyphoscoliosis peptidaseDisease-causing germline mutation(s) inTolerante
VIAS BIOLÓGICAS (1)
E3 ubiquitin ligases ubiquitinate target proteins
MECANISMO DE DOENÇA

Myopathy, myofibrillar, 7

A form of myofibrillar myopathy, a group of chronic neuromuscular disorders characterized at ultrastructural level by disintegration of the sarcomeric Z disk and myofibrils, and replacement of the normal myofibrillar markings by small dense granules, or larger hyaline masses, or amorphous material. MFM7 is an autosomal recessive form, clinically characterized by early childhood onset of slowly progressive muscle weakness and mild atrophy primarily affecting the lower limbs, associated with joint contractures.

EXPRESSÃO TECIDUAL(Tecido-específico)
Skin Not Sun Exposed Suprapubic
8.7 TPM
Skin Sun Exposed Lower leg
6.8 TPM
Pituitária
6.4 TPM
Glândula adrenal
3.9 TPM
Fallopian Tube
3.7 TPM
INTERAÇÕES PROTEICAS (2)
OUTRAS DOENÇAS (3)
myofibrillar myopathy 7kyphosis-lateral tongue atrophy-myofibrillar myopathy syndromekyphoscoliosis-lateral tongue atrophy-hereditary spastic paraplegia syndrome
HGNC:26576UniProt:Q8NBH2
UNC45BProtein unc-45 homolog BDisease-causing germline mutation(s) inTolerante
MECANISMO DE DOENÇA

Cataract 43

An opacification of the crystalline lens of the eye that frequently results in visual impairment or blindness. Opacities vary in morphology, are often confined to a portion of the lens, and may be static or progressive. In general, the more posteriorly located and dense an opacity, the greater the impact on visual function.

EXPRESSÃO TECIDUAL(Tecido-específico)
Músculo esquelético
83.7 TPM
Coração - Ventrículo esquerdo
50.8 TPM
Coração - Átrio
46.9 TPM
Artéria coronária
9.3 TPM
Testículo
2.2 TPM
OUTRAS DOENÇAS (4)
myofibrillar myopathy 11cataract 43early-onset nuclear cataractearly-onset posterior subcapsular cataract
HGNC:14304UniProt:Q8IWX7
BAG3BAG family molecular chaperone regulator 3Disease-causing germline mutation(s) inAltamente restrito
VIAS BIOLÓGICAS (1)
Regulation of HSF1-mediated heat shock response
MECANISMO DE DOENÇA

Myopathy, myofibrillar, 6

A form of myofibrillar myopathy, a group of chronic neuromuscular disorders characterized at ultrastructural level by disintegration of the sarcomeric Z disk and myofibrils, and replacement of the normal myofibrillar markings by small dense granules, or larger hyaline masses, or amorphous material. MFM6 is characterized by early-onset of severe, progressive, diffuse muscle weakness associated with cardiomyopathy, severe respiratory insufficiency during adolescence, and a rigid spine in some patients.

OUTRAS DOENÇAS (5)
myofibrillar myopathy 6dilated cardiomyopathy 1HHCharcot-Marie-tooth disease, axonal, type 2JJneuronopathy, distal hereditary motor, autosomal dominant 15
HGNC:939UniProt:O95817
HSPB8Heat shock protein beta-8Disease-causing germline mutation(s) inTolerante
VIAS BIOLÓGICAS (1)
HSF1-dependent transactivation
MECANISMO DE DOENÇA

Neuronopathy, distal hereditary motor, autosomal dominant 2

A form of distal hereditary motor neuronopathy, a heterogeneous group of neuromuscular disorders caused by selective degeneration of motor neurons in the anterior horn of the spinal cord, without sensory deficit in the posterior horn. The overall clinical picture consists of a classical distal muscular atrophy syndrome in the legs without clinical sensory loss. The disease starts with weakness and wasting of distal muscles of the anterior tibial and peroneal compartments of the legs. Later on, weakness and atrophy may expand to the proximal muscles of the lower limbs and/or to the distal upper limbs.

EXPRESSÃO TECIDUAL(Ubíquo)
Esôfago - Muscular
583.2 TPM
Cólon sigmoide
522.6 TPM
Músculo esquelético
501.7 TPM
Esôfago - Junção
499.1 TPM
Artéria tibial
307.4 TPM
OUTRAS DOENÇAS (4)
myopathy, myofibrillar, 13, with rimmed vacuolesneuronopathy, distal hereditary motor, type 2ACharcot-Marie-Tooth disease axonal type 2Ldistal hereditary motor neuropathy type 2
HGNC:30171UniProt:Q9UJY1
DESDesminDisease-causing germline mutation(s) inTolerante
VIAS BIOLÓGICAS (1)
Striated Muscle Contraction
MECANISMO DE DOENÇA

Myopathy, myofibrillar, 1

A form of myofibrillar myopathy, a group of chronic neuromuscular disorders characterized at ultrastructural level by disintegration of the sarcomeric Z disk and myofibrils, and replacement of the normal myofibrillar markings by small dense granules, or larger hyaline masses, or amorphous material. MFM1 is characterized by skeletal muscle weakness associated with cardiac conduction blocks, arrhythmias, restrictive heart failure, and accumulation of desmin-reactive deposits in cardiac and skeletal muscle cells.

EXPRESSÃO TECIDUAL(Ubíquo)
Esôfago - Muscular
14058.1 TPM
Cólon sigmoide
13011.1 TPM
Músculo esquelético
12069.4 TPM
Esôfago - Junção
10253.3 TPM
Coração - Ventrículo esquerdo
8346.0 TPM
OUTRAS DOENÇAS (4)
myofibrillar myopathy 1neurogenic scapuloperoneal syndrome, Kaeser typedilated cardiomyopathy 1Ifamilial isolated dilated cardiomyopathy
HGNC:2770UniProt:P17661
FLNCFilamin-CDisease-causing germline mutation(s) inAltamente restrito
VIAS BIOLÓGICAS (1)
Cell-extracellular matrix interactions
MECANISMO DE DOENÇA

Myopathy, myofibrillar, 5

A form of myofibrillar myopathy, a group of chronic neuromuscular disorders characterized at ultrastructural level by disintegration of the sarcomeric Z disk and myofibrils, and replacement of the normal myofibrillar markings by small dense granules, or larger hyaline masses, or amorphous material. MFM5 is characterized by onset in adulthood, clinical features of a limb-girdle myopathy, and focal myofibrillar destruction.

EXPRESSÃO TECIDUAL(Ubíquo)
Músculo esquelético
996.8 TPM
Cólon sigmoide
375.8 TPM
Esôfago - Muscular
300.4 TPM
Coração - Ventrículo esquerdo
291.6 TPM
Esôfago - Junção
246.6 TPM
OUTRAS DOENÇAS (4)
myofibrillar myopathy 5hypertrophic cardiomyopathy 26distal myopathy with posterior leg and anterior hand involvementobsolete familial isolated restrictive cardiomyopathy
HGNC:3756UniProt:Q14315
CRYABAlpha-crystallin B chainDisease-causing germline mutation(s) inTolerante
VIAS BIOLÓGICAS (1)
HSF1-dependent transactivation
MECANISMO DE DOENÇA

Myopathy, myofibrillar, 2A, adult-onset

A form of myofibrillar myopathy, a group of chronic neuromuscular disorders characterized at ultrastructural level by disintegration of the sarcomeric Z disk and myofibrils, and replacement of the normal myofibrillar markings by small dense granules, or larger hyaline masses, or amorphous material. MFM2A is an autosomal dominant form characterized by weakness of the proximal and distal limb muscles, weakness of the neck, velopharynx and trunk muscles, respiratory insufficiency, hypertrophic cardiomyopathy, and cataract.

EXPRESSÃO TECIDUAL(Ubíquo)
Coração - Ventrículo esquerdo
1863.3 TPM
Brain Spinal cord cervical c-1
1663.2 TPM
Coração - Átrio
1591.1 TPM
Músculo esquelético
1435.1 TPM
Nervo tibial
1093.8 TPM
OUTRAS DOENÇAS (8)
fatal infantile hypertonic myofibrillar myopathymyofibrillar myopathy 2dilated cardiomyopathy 1IIcataract 16 multiple types
HGNC:2389UniProt:P02511

Variantes genéticas (ClinVar)

6.563 variantes patogênicas registradas no ClinVar.

🧬 MYL2: NM_000432.4(MYL2):c.64G>C (p.Glu22Gln) ()
🧬 MYL2: NM_000432.4(MYL2):c.120G>C (p.Arg40Ser) ()
🧬 MYL2: GRCh37/hg19 12q23.1-24.33(chr12:99532287-133777902)x3 ()
🧬 MYL2: NM_000432.4(MYL2):c.25A>G (p.Arg9Gly) ()
🧬 MYL2: NM_000432.4(MYL2):c.152A>G (p.Asp51Gly) ()
Ver todas no ClinVar

Classificação de variantes (ClinVar)

Distribuição de 9.157 variantes classificadas pelo ClinVar.

2747
6410
VUS (30.0%)
Benigna (70.0%)
VARIANTES MAIS SIGNIFICATIVAS
FLNC: NM_001458.5(FLNC):c.7739C>T (p.Pro2580Leu) [Uncertain significance]
FLNC: NM_001458.5(FLNC):c.4591A>T (p.Ile1531Phe) [Uncertain significance]
FLNC: NM_001458.5(FLNC):c.1952A>G (p.Asp651Gly) [Uncertain significance]
FLNC: NM_001458.5(FLNC):c.4580+6G>T [Uncertain significance]
FLNC: NM_001458.5(FLNC):c.6437C>T (p.Ser2146Phe) [Uncertain significance]

Diagnóstico

Os sinais que médicos procuram e os exames que confirmam

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Tratamento e manejo

Remédios, cuidados de apoio e o que precisa acompanhar

Pipeline de tratamentos
Pipeline regulatório — de medicamentos já aprovados a drogas em pesquisa exploratória.
·Pré-clínico1
Medicamentos catalogadosEnsaios clínicos· 0 medicamentos · 1 ensaio
Carregando informações de tratamento...

Onde tratar no SUS

Hospitais de referência no Brasil e o protocolo oficial do SUS (PCDT)

🇧🇷 Atendimento SUS — Miopatia miofibrilar

🗺️

Selecione um estado ou use sua localização para ver resultados.

Dados de DATASUS/CNES, SBGM, ABNeuro e Ministério da Saúde. Sempre confirme a disponibilidade diretamente com o estabelecimento.

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Ensaios clínicos abertos e novidades científicas recentes

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Publicações mais relevantes

Timeline de publicações
213 papers (10 anos)
#1

Concurrent FHL1-Related Myopathy and CMT1A Unveiled by Persistent Neuropathic Feature.

JAMA neurology2026 Feb 01

This case report describes a patient with X-linked FHL1-related myofibrillar myopathy and Charcot-Marie-Tooth disease type 1A, a dual pathology revealed by imaging and genetic testing.

#2

Multi-Parametric MRI Approach at 3 T and 7 T for Assessing Skeletal Muscle Pathology in Myofibrillar Myopathies: A Pilot Study.

Journal of cachexia, sarcopenia and muscle2026 Apr

Myofibrillar myopathies (MFM) form a large group of clinically and genetically heterogeneous protein aggregate diseases. We investigated whether a novel quantitative MRI protocol can reveal new aspects of structural and biochemical muscle pathology in three classic MFM subtypes. MRI of the lower legs was performed in nine MFM patients with filamin-C (FLNC; n = 5), desmin (DES, n = 2) and LIM domain binding 3 (LDB3; n = 2) gene mutations, one patient with non-MFM, filamin-C related distal myopathy (4 males, 6 females, 51.0 ± 7.7 years) and 10 age-matched healthy control subjects (5 males, 5 females, 50.0 ± 11.0 years). 1H MRI at 3 T addressed fatty replacement and edema-like changes as well as quantitative measurements of proton density fat fraction (PDFF) and water T2 relaxation times. 39K/23Na MRI at 7 T was employed to determine apparent tissue potassium and tissue sodium concentrations (aTPC/aTSC). T1-weighted and T2-weighted STIR imaging showed the highest degree of fat replacement in the soleus and gastrocnemius medialis muscle regions and the highest degree of edema-like changes in the extensor regions in all 10 myopathy patients. The lowest degree of fat replacement and edema-like changes was present in the gastrocnemius lateralis muscles. Marked fatty replacement of peroneus muscles was also present in DES-related MFM and FLNC-related distal myopathy. Muscular PDFF values were significantly increased in all MFM patients (p = 0.003 - < 0.001) with 60 and 35 of 63 muscles analysed showing increased mean PDFF (> 10% and > 50%). When excluding the muscles with PDFF > 50%, the median water T2 was significantly increased in all muscle regions of MFM patients with the exception of the tibialis anterior and posterior muscles. Fat-corrected aTSC values in MFM patients were significantly increased compared to healthy controls (55.6 ± 16.3 mM vs. 23.2 ± 5.5 mM, p < 0.001) in all muscles but peroneus muscles, whereas fat-corrected aTPC values were reduced in all muscles except for gastrocnemius lateralis, tibialis posterior and peroneus muscles (75.4 ± 13.3 mM vs. 108.9 ± 9.9 mM, p < 0.001). Quantitative PDFF measurements and water T2 mapping serve as valuable tools to objectively quantify fat and edema-like changes in MFM. Furthermore, changes in potassium/sodium ion balance in the lower leg muscles of MFM patients could serve as new markers to quantify the extent of biochemical changes in individual muscle regions. Further longitudinal evaluation is required to validate whether they are sensitive to changes prior to a high degree of fat replacement.

#3

Anaesthetic Management of a Patient With LDB3-Associated Myopathy Undergoing Prostate Biopsy Under Total Intravenous Anaesthesia: A Case Report.

Cureus2026 Feb

Mutations in the LDB3 gene are implicated in myofibrillar myopathy and cardiomyopathy. Consider cardiac conduction defects and the muscle's sensitivity to some anaesthetics when providing anaesthesia in the perioperative period. We present the anaesthetic management of a 76-year-old man with genetically confirmed LDB3 mutation who presented for prostate biopsy with a background of progressive distal myopathy, mild cardiac involvement, and normal activities of daily living (ADL), undergoing anaesthesia using total intravenous anaesthesia (TIVA) to avoid the use of volatile agents or neuromuscular blockers. In this patient with a history of LDB3-associated myopathy, the use of TIVA provided a safe and effective technique of anaesthesia, and reinforced the need for an individualised anaesthetic strategy in neuromuscular disease (NMD).

#4

Correction: BAG3-related myofibrillar myopathy: focus on its cardiac involvement.

Frontiers in genetics2026

[This corrects the article DOI: 10.3389/fgene.2025.1636999.].

#5

Novel in-frame variant in DES (p.Glu353dup) causes myofibrillar myopathy: clinical, in silico and functional studies.

Journal of medical genetics2026 Mar 20

Desmin (DES) is a major intermediate filament protein involved in the structural integrity and function of striated muscles. Pathogenic mutations in DES are predominantly missense variants, causing isolated cardiomyopathy and combinations of myopathy and cardiomyopathy. In-frame insertions are very rare and usually classified as variants of uncertain significance or likely pathogenic due to limited predictive and/or experimental evidence. This study describes a novel heterozygous in-frame insertion in exon 6 of DES (RefSeq NM_001927.4:c.1059_1061dup) identified in an Argentine family with myofibrillar myopathy (MFM). This mutation results in the duplication of a glutamic acid residue at position 353 (NP_001918.3:p.(Glu353dup)), in the 2B subdomain of the central rod domain. Clinical, computational and functional analyses were performed to study the pathogenicity of this variant. Clinically, the index patient exhibited hallmark MFM features, including progressive muscle weakness, atrophy and fatty muscle replacement. In silico analyses of molecular dynamics revealed that p.Glu353dup alters DES dimer assembly by stabilising an aberrant coiled-coil conformation, a mechanism not previously proposed for DES mutations. Functional studies in HEK293T cells and C2C12 myocytes suggested that the p.Glu353dup variant induces aberrant DES aggregation, confirming its detrimental effect on filament organisation. These findings are consistent with the idea that p.Glu353dup is a pathogenic variant, supported by clinical studies, in silico protein modelling and functional evidence, highlighting the impact of in-frame insertions on DES filament homeostasis. By providing computational and experimental evidence, this study expands our understanding of desminopathies and offers new perspectives for pathogenicity assessment of uncertain DES variants.

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Referências

Fontes citadas no texto, publicações do grafo e bases de dados usadas neste verbete

9 publicações do grafo RarasNet (PubMed) · 6 bases de dados. Títulos, periódicos e PMIDs vêm direto da fonte, sem intermediação de IA.

  1. ORPHA:593
    Orphanet
  2. GARD:10529
    GARD (NIH)
  3. Q23893414
    Wikidata

Dados compilados pelo RarasNet a partir de fontes abertas (Orphanet, OMIM, MONDO, PubMed/EuropePMC, ClinicalTrials.gov, DATASUS, PCDT/MS). Este conteúdo é informativo e não substitui avaliação médica.

Citar este verbete

Raras. (s.d.). Miopatia miofibrilar. Em Raras — Enciclopédia de Doenças Raras do Brasil. https://raras.org/doenca/miopatia-miofibrilar

Formato APA. Conteúdo sob CC BY 4.0 — reuso livre com atribuição.

Conteúdo mantido por Agente Raras · Médicos e pesquisadores podem colaborar

Compêndio · Raras BR

Miopatia miofibrilar

ORPHA:593 · MONDO:0018943
Prevalência
Unknown
Herança
Autosomal dominant, Autosomal recessive
CID-10
G71.8 · Outros transtornos primários dos músculos
CID-11
Ensaios
1 ativos
Início
Adult
Prevalência
0.0 (Worldwide)
MedGen
UMLS
C2678065
EuropePMC
Wikidata
Papers 10a

📋 Origem dos dados

Esta página agrega dados de fontes públicas e oficiais. Dados sobre cobertura no SUS (PCDT, CEAF) são verificados ativamente por agente proativo (ver badge no infobox). Demais dados têm atribuição de fonte + data da última sincronização — clique para abrir o original.

Doença rara (ontologia)
fonte: Orphanet
Identificador unificado
fonte: MONDO
Indexação biomédica
fonte: MeSH (NLM)
Dado público estruturado
fonte: Wikidata
Rara