A miopatia nemalínica típica (MN) é uma forma moderada da doença que aparece em recém-nascidos. Ela causa fraqueza nos músculos do rosto e do corpo, e uma dificuldade leve para respirar.
Introdução
O que você precisa saber de cara
A miopatia nemalínica típica (MN) é uma forma moderada da doença que aparece em recém-nascidos. Ela causa fraqueza nos músculos do rosto e do corpo, e uma dificuldade leve para respirar.
Escala de raridade
<1/50kMuito rara
1/20kRara
1/10kPouco freq.
1/5kIncomum
1/2k
Encontrou um erro ou informação desatualizada? Sugira uma correção →
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
+ 48 sintomas em outras categorias
Características mais comuns
Os sintomas variam de pessoa para pessoa. Abaixo estão as 130 características clínicas mais associadas, ordenadas por frequência.
Linha do tempo da pesquisa
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
6 genes identificados com associação a esta condição. Padrão de herança: Autosomal dominant, Autosomal recessive.
Binds to actin filaments in muscle and non-muscle cells. Plays a central role, in association with the troponin complex, in the calcium dependent regulation of vertebrate striated muscle contraction. Smooth muscle contraction is regulated by interaction with caldesmon. In non-muscle cells is implicated in stabilizing cytoskeleton actin filaments. The non-muscle isoform may have a role in agonist-mediated receptor internalization
Cytoplasm, cytoskeleton
Congenital myopathy 23
An autosomal dominant muscular disorder characterized clinically by hypotonia and muscle weakness, and a static or slowly progressive clinical course. Disease onset ranges from birth to childhood. Histologic examination of muscle fibers shows various anomalies including fiber type disproportion, an irregular myofibrillar network, abnormal thread-like or rod-shaped structures, and cap-like structures which are well demarcated and peripherally located under the sarcolemma with abnormal accumulation of sarcomeric proteins.
Actins are highly conserved proteins that are involved in various types of cell motility and are ubiquitously expressed in all eukaryotic cells
Cytoplasm, cytoskeleton
Congenital myopathy 2A, typical, autosomal dominant
A muscular disorder characterized by generalized muscle weakness, delayed motor milestones, hypotonia, and muscle fiber abnormalities on histologic examination. Histologic findings include abnormal thread- or rod-like structures (nemaline rods), intranuclear rods, clumped filaments, cores, or fiber-type disproportion. The spectrum of clinical phenotypes ranges from severe neonatal presentations to onset of a milder disorder in childhood.
Essential for the organization of sarcomeric actin thin filaments in skeletal muscle (PubMed:25250574). Increases the rate of actin polymerization (PubMed:25250574)
CytoplasmCytoplasm, myofibril, sarcomere, M lineCytoplasm, myofibril, sarcomere, A bandCytoplasm, cytoskeleton
Nemaline myopathy 10
An autosomal recessive severe form of nemaline myopathy. Nemaline myopathies are muscular disorders characterized by muscle weakness of varying severity and onset, and abnormal thread-like or rod-shaped structures in muscle fibers on histologic examination. NEM10 is characterized by early-onset generalized muscle weakness and hypotonia with respiratory insufficiency and feeding difficulties. Additional features include arthrogryposis or congenital contractures, ophthalmoplegia, a history of prematurity, reduced fetal movements, and polyhydramnios. Most patients die of respiratory failure in early infancy.
This giant muscle protein may be involved in maintaining the structural integrity of sarcomeres and the membrane system associated with the myofibrils. Binds and stabilize F-actin
Cytoplasm, myofibril, sarcomereCytoplasm, cytoskeleton
Nemaline myopathy 2
A form of nemaline myopathy. Nemaline myopathies are muscular disorders characterized by muscle weakness of varying severity and onset, and abnormal thread-like or rod-shaped structures in muscle fibers on histologic examination.
Involved in skeletal muscle development and differentiation. Regulates proliferation and differentiation of myoblasts and plays a role in myofibril assembly by promoting lateral fusion of adjacent thin fibrils into mature, wide myofibrils. Required for pseudopod elongation in transformed cells
CytoplasmCytoplasm, cytoskeletonCell projection, pseudopodiumCell projection, ruffleCytoplasm, myofibril, sarcomere, M lineSarcoplasmic reticulum membraneEndoplasmic reticulum membrane
Nemaline myopathy 9
An autosomal recessive form of nemaline myopathy. Nemaline myopathies are muscular disorders characterized by muscle weakness of varying severity and onset, and abnormal thread-like or rod-shaped structures in muscle fibers on histologic examination. NEM9 phenotype is highly variable, ranging from death in infancy due to lack of antigravity movements, to slowly progressive distal muscle weakness with preserved ambulation later in childhood.
Controls reversibly actin polymerization and depolymerization in a pH-sensitive manner. Its F-actin depolymerization activity is regulated by association with CSPR3 (PubMed:19752190). It has the ability to bind G- and F-actin in a 1:1 ratio of cofilin to actin. It is the major component of intranuclear and cytoplasmic actin rods. Required for muscle maintenance. May play a role during the exchange of alpha-actin forms during the early postnatal remodeling of the sarcomere (By similarity)
Nucleus matrixCytoplasm, cytoskeleton
Nemaline myopathy 7
A form of nemaline myopathy. Nemaline myopathies are muscular disorders characterized by muscle weakness of varying severity and onset, and abnormal thread-like or rod-shaped structures in muscle fibers on histologic examination. Nemaline myopathy type 7 presents at birth with hypotonia and generalized weakness. Major motor milestones are delayed, but independent ambulation is achieved.
Variantes genéticas (ClinVar)
545 variantes patogênicas registradas no ClinVar.
Vias biológicas (Reactome)
6 vias biológicas associadas aos genes desta condição.
Diagnóstico
Os sinais que médicos procuram e os exames que confirmam
Tratamento e manejo
Remédios, cuidados de apoio e o que precisa acompanhar
Onde tratar no SUS
Hospitais de referência no Brasil e o protocolo oficial do SUS (PCDT)
🇧🇷 Atendimento SUS — Miopatia nemalínica típica
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.
Pesquisa ativa
Ensaios clínicos abertos e novidades científicas recentes
Pesquisa e ensaios clínicos
Nenhum ensaio clínico registrado para esta condição.
Publicações mais relevantes
Pharmacological Inhibition of Myostatin in a Mouse Model of Typical Nemaline Myopathy Increases Muscle Size and Force.
Nemaline myopathy is one of the most common non-dystrophic congenital myopathies. Individuals affected by this condition experience muscle weakness and muscle smallness, often requiring supportive measures like wheelchairs or respiratory support. A significant proportion of patients, approximately one-third, exhibit compound heterozygous nebulin mutations, which usually give rise to the typical form of the disease. Currently, there are no approved treatments available for nemaline myopathy. Our research explored the modulation of myostatin, a negative regulator of muscle mass, in combating the muscle smallness associated with the disease. To investigate the effect of myostatin inhibition, we employed a mouse model with compound heterozygous nebulin mutations that mimic the typical form of the disease. The mice were treated with mRK35, a myostatin antibody, through weekly intraperitoneal injections of 10 mg/kg mRK35, commencing at two weeks of age and continuing until the mice reached four months of age. The treatment resulted in an increase in body weight and an approximate 20% muscle weight gain across most skeletal muscles, without affecting the heart. The minimum Feret diameter of type IIA and IIB fibers exhibited an increase in compound heterozygous mice, while only type IIB fibers demonstrated an increase in wild-type mice. In vitro mechanical experiments conducted on intact extensor digitorum longus muscle revealed that mRK35 augmented the physiological cross-sectional area of muscle fibers and enhanced absolute tetanic force in both wild-type and compound heterozygous mice. Furthermore, mRK35 administration improved grip strength in treated mice. Collectively, these findings indicate that inhibiting myostatin can mitigate the muscle deficits in nebulin-based typical nemaline myopathy, potentially serving as a much-needed therapeutic option.
Generation of two isogenic induced pluripotent stem cell lines from a 10-year-old typical nemaline myopathy patient with a heterozygous dominant c.541G>A (p.Asp179Asn) pathogenic variant in the ACTA1 gene.
Nemaline myopathy (NM) is a congenital myopathy typically characterized by skeletal muscle weakness and the presence of nemaline bodies in myofibres. Approximately 25% of NM cases are caused by variants in ACTA1. We generated two induced pluripotent stem cell lines from lymphoblastoid cells of a 10-year-old female with typical NM harbouring a dominant pathogenic variant in ACTA1 (c.541C>A). The isogenic lines displayed typical iPSC morphology, expressed pluripotency markers, and could differentiate into each of the three germ layers. Although the lines have partial or complete X chromosome duplication, they may still prove useful as models of human ACTA1 disease.
Triggering typical nemaline myopathy with compound heterozygous nebulin mutations reveals myofilament structural changes as pathomechanism.
Nebulin is a giant protein that winds around the actin filaments in the skeletal muscle sarcomere. Compound-heterozygous mutations in the nebulin gene (NEB) cause typical nemaline myopathy (NM), a muscle disorder characterized by muscle weakness with limited treatment options. We created a mouse model with a missense mutation p.Ser6366Ile and a deletion of NEB exon 55, the Compound-Het model that resembles typical NM. We show that Compound-Het mice are growth-retarded and have muscle weakness. Muscles have a reduced myofibrillar fractional-area and sarcomeres are disorganized, contain rod bodies, and have longer thin filaments. In contrast to nebulin-based severe NM where haplo-insufficiency is the disease driver, Compound-Het mice express normal amounts of nebulin. X-ray diffraction revealed that the actin filament is twisted with a larger radius, that tropomyosin and troponin behavior is altered, and that the myofilament spacing is increased. The unique disease mechanism of nebulin-based typical NM reveals novel therapeutic targets.
Sudden cardiac arrest in a child with nemaline myopathy.
Nemaline myopathy is a rare, non progressive congenital skeletal muscle disorder defined by the presence of inclusions known as nemaline rods in muscle fibers. Several clinical subtypes have been described, according to degree of muscle weakness, severity and age at onset. The course of nemaline myopathy is very slowly progressive, and death is usually due to respiratory failure. Cardiac involvement is rare and generally considered to be the result of ACTA1 mutations. We report the case of a 6 year old boy with typical congenital nemaline myopathy. Nemaline myopathy was confirmed at 3 years of age by muscle biopsy. No mutation of ACTA1, TPM2 and TNNT1 genes was detected. The child died suddenly of cardiac arrest and associated hypoxic-ischemic brain injury, in absence of acute respiratory failure or swallowing difficulties. Nemaline cardiomyopathy was suspected, but post mortem cardiac biopsy did not show findings consistent with nemaline myopathy. Congenital typical nemaline myopathy is not necessarily a static or very slowly progressive disorder and acute cardiac deterioration can lead to early death.
Publicações recentes
Pharmacological Inhibition of Myostatin in a Mouse Model of Typical Nemaline Myopathy Increases Muscle Size and Force.
Generation of two isogenic induced pluripotent stem cell lines from a 10-year-old typical nemaline myopathy patient with a heterozygous dominant c.541G>A (p.Asp179Asn) pathogenic variant in the ACTA1 gene.
Triggering typical nemaline myopathy with compound heterozygous nebulin mutations reveals myofilament structural changes as pathomechanism.
Sudden cardiac arrest in a child with nemaline myopathy.
The exon 55 deletion in the nebulin gene--one single founder mutation with world-wide occurrence.
📚 EuropePMC3 artigos no totalmostrando 4
Pharmacological Inhibition of Myostatin in a Mouse Model of Typical Nemaline Myopathy Increases Muscle Size and Force.
International journal of molecular sciencesGeneration of two isogenic induced pluripotent stem cell lines from a 10-year-old typical nemaline myopathy patient with a heterozygous dominant c.541G>A (p.Asp179Asn) pathogenic variant in the ACTA1 gene.
Stem cell researchTriggering typical nemaline myopathy with compound heterozygous nebulin mutations reveals myofilament structural changes as pathomechanism.
Nature communicationsSudden cardiac arrest in a child with nemaline myopathy.
Italian journal of pediatricsAssociações
Organizações que acompanham esta doença — pra ter apoio e orientação
Ainda não temos associações cadastradas para Miopatia nemalínica típica.
É de uma associação que acompanha esta doença? Fale com a gente →
Comunidades
Grupos ativos de quem convive com esta doença aqui no Raras
Ainda não existe comunidade no Raras para Miopatia nemalínica típica
Pacientes, familiares e cuidadores se organizam em comunidades pra compartilhar experiências, fazer perguntas e se apoiar. Você pode ser o primeiro.
Tire suas dúvidas
Perguntas, dicas e experiências compartilhadas aqui na página
Participe da discussão
Faça login para postar dúvidas, compartilhar experiências e interagir com especialistas.
Fazer loginDoenças relacionadas
Doenças com sintomas parecidos — ajudam quem ainda está buscando diagnóstico
Referências e fontes
Bases de dados externas citadas neste artigo
Publicações científicas
Artigos indexados no PubMed ligados a esta doença no grafo RarasNet — título, periódico e PMID direto da fonte, sem intermediação de IA.
- Pharmacological Inhibition of Myostatin in a Mouse Model of Typical Nemaline Myopathy Increases Muscle Size and Force.
- Generation of two isogenic induced pluripotent stem cell lines from a 10-year-old typical nemaline myopathy patient with a heterozygous dominant c.541G>A (p.Asp179Asn) pathogenic variant in the ACTA1 gene.
- Triggering typical nemaline myopathy with compound heterozygous nebulin mutations reveals myofilament structural changes as pathomechanism.
- Sudden cardiac arrest in a child with nemaline myopathy.
- The exon 55 deletion in the nebulin gene--one single founder mutation with world-wide occurrence.
Bases de dados e fontes oficiais
Identificadores e referências canônicas usadas para montar este verbete.
- ORPHA:171436(Orphanet)
- MONDO:0015737(MONDO)
- GARD:12822(GARD (NIH))
- Variantes catalogadas(ClinVar)
- Busca completa no PubMed(PubMed)
- Q56013755(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.
Conteúdo mantido por Agente Raras · Médicos e pesquisadores podem colaborar
