Limb-girdle muscular dystrophy type 2B
Prevalence estimates on Rare Medical Network websites are calculated based on data available from numerous sources, including US and European government statistics, the NIH, Orphanet, and published epidemiologic studies. Rare disease population data is recognized to be highly variable, and based on a wide variety of source data and methodologies, so the prevalence data on this site should be assumed to be estimated and cannot be considered to be absolutely correct.
Age of Onset
Autosomal dominant ?A pathogenic variant in only one gene copy in each cell is sufficient to cause an autosomal dominant disease
Autosomal recessive ?Pathogenic variants in both copies of each gene of the chromosome are needed to cause an autosomal recessive disease and observe the mutant phenotype
X-linked dominant ?X-linked dominant inheritance, sometimes referred to as X-linked dominance, is a mode of genetic inheritance by which a dominant gene is carried on the X chromosome.
X-linked recessive ?Pathogenic variants in both copies of a gene on the X chromosome cause an X-linked recessive disorder
Mitochondrial or multigenic ?Mitochondrial genetic disorders can be caused by changes (mutations) in either the mitochondrial DNA or nuclear DNA that lead to dysfunction of the mitochondria and inadequate production of energy.
Multigenic or multifactor ?Inheritance involving many factors, of which at least one is genetic but none is of overwhelming importance, as in the causation of a disease by multiple genetic and environmental factors.
Other Names (AKA)
LGMD2B; Muscular dystrophy, limb-girdle, type 3; LGMD3
Congenital and Genetic Diseases; Musculoskeletal Diseases; Nervous System Diseases
Limb-girdle muscular dystrophy type 2B (LGMD2B) is one type of limb-girdle muscular dystrophy. These diseases affect the voluntary muscles, which are the muscles that are moved on purpose, such as the arms, legs, fingers, toes, and facial muscles. Specifically, LGMD2B is a slowly progressive disease that causes muscle weakness and wasting (atrophy) of the
LGMD2B is caused by variations (also known
The symptoms of LGMD2B typically begin in adolescence or young adulthood. The age of onset ranges from 15 to 35 years, and the legs are usually the first part of the body affected. Symptoms that may be common in other types of limb-girdle muscular dystrophy, such as heart (cardiac) and breathing (respiratory) problems, are uncommon in people with LGMD2B. The signs and symptoms of people with LGMD2B can vary, even among members of the same family.
This table lists symptoms that people with this disease may have. For most diseases, symptoms will vary from person to person. People with the same disease may not have all the symptoms listed. This information comes from a database called the Human Phenotype Ontology (HPO) . The HPO collects information on symptoms that have been described in medical resources. The HPO is updated regularly. Use the HPO ID to access more in-depth information about a symptom.
|Medical Terms||Other Names||
|80%-99% of people have these symptoms|
|Elevated serum creatine kinase||
Elevated blood creatine phosphokinase
Elevated circulating creatine phosphokinase
Elevated creatine kinase
Elevated serum CPK
Elevated serum creatine phosphokinase
High serum creatine kinase
Increased creatine kinase
Increased creatine phosphokinase
Increased serum CK
Increased serum creatine kinase
Increased serum creatine phosphokinase
[ more ]
|30%-79% of people have these symptoms|
|Lower limb muscle weakness||
Lower extremity weakness
Lower limb weakness
Muscle weakness in lower limbs
[ more ]
|Proximal muscle weakness in lower limbs||0008994|
|5%-29% of people have these symptoms|
|Calf muscle hypertrophy||
Increased size of calf muscles
Increased heart size
[ more ]
|Difficulty climbing stairs||
Difficulty walking up stairs
|Neck flexor weakness||
Neck flexion weakness
|Proximal muscle weakness in upper limbs||0008997|
|Reduced ejection fraction||0012664|
|Reduced tendon reflexes||0001315|
|Right bundle branch block||0011712|
|Right ventricular hypertrophy||0001667|
Winged shoulder blade
|1%-4% of people have these symptoms|
|Brachial plexus neuropathy||0045054|
|Distal upper limb muscle weakness||0008959|
[ more ]
|Inability to walk||0002540|
|Limited elbow movement||
Decreased elbow mobility
Limited elbow mobility
Restricted elbow motion
[ more ]
|Limited hip movement||0008800|
|Limited knee flexion/extension||0005085|
Reduced spine movement
Walking on tiptoes
|Percent of people who have these symptoms is not available through HPO|
|EMG: myopathic abnormalities||0003458|
[ more ]
|Increased variability in muscle fiber diameter||0003557|
|Muscle fiber splitting||0003555|
|Proximal muscle weakness||
Weakness in muscles of upper arms and upper legs
Signs and symptoms worsen slowly with time
- Electromyography (EMG)
- Creatine-kinase levels
- Muscle biopsy
- Immunoblotting to determine if the dysferlin
proteinis present at typical levels
- The Genetic Testing Registry (GTR) provides information about the genetic tests for this condition. The intended audience for the GTR is health care providers and researchers. Patients and consumers with specific questions about a genetic test should contact a health care provider or a genetics professional.
- The Jain Foundation sponsors genetic testing to confirm the diagnosis of dysferlinopathy.
- Weight control to avoid obesity
Physical therapyand stretching exercises
- Use of mechanical aids such as canes, walkers, and wheelchairs
It is recommended that people with LGMD2B be provided with social and emotional support to cope with the diagnosis. Other specialists that may be recommended include a
Support and advocacy groups can help you connect with other patients and families, and they can provide valuable services. Many develop patient-centered information and are the driving force behind research for better treatments and possible cures. They can direct you to research, resources, and services. Many organizations also have experts who serve as medical advisors or provide lists of doctors/clinics. Visit the group’s website or contact them to learn about the services they offer. Inclusion on this list is not an endorsement by GARD.
These resources provide more information about this condition or associated symptoms. The in-depth resources contain medical and scientific language that may be hard to understand. You may want to review these resources with a medical professional.
- MedlinePlus was designed by the National Library of Medicine to help you research your health questions, and it provides more information about this topic.
- Genetics Home Reference (GHR) contains information on Limb-girdle muscular dystrophy type 2B. This website is maintained by the National Library of Medicine.
- Muscular Dystrophy Association has information and resources about Limb-girdle muscular dystrophy type 2B. Please click on the link to access this resource.
- The National Institute of Neurological Disorders and Stroke (NINDS) collects and disseminates research information related to neurological disorders. Click on the link to view information on this topic.
- The National Organization for Rare Disorders (NORD) has a report for patients and families about this condition. NORD is a patient advocacy organization for individuals with rare diseases and the organizations that serve them.
- GeneReviews provides current, expert-authored, peer-reviewed, full-text articles describing the application of genetic testing to the diagnosis, management, and genetic counseling of patients with specific inherited conditions.
- Medscape Reference provides information on this topic. You may need to register to view the medical textbook, but registration is free.
- The Monarch Initiative brings together data about this condition from humans and other species to help physicians and biomedical researchers. Monarch’s tools are designed to make it easier to compare the signs and symptoms (phenotypes) of different diseases and discover common features. This initiative is a collaboration between several academic institutions across the world and is funded by the National Institutes of Health. Visit the website to explore the biology of this condition.
- Online Mendelian Inheritance in Man (OMIM) is a catalog of human genes and genetic disorders. Each entry has a summary of related medical articles. It is meant for health care professionals and researchers. OMIM is maintained by Johns Hopkins University School of Medicine.
- Orphanet is a European reference portal for information on rare diseases and orphan drugs. Access to this database is free of charge.
- PubMed is a searchable database of medical literature and lists journal articles that discuss Limb-girdle muscular dystrophy type 2B. Click on the link to view a sample search on this topic.
- Aoki M. Dysferlinopathy. GeneReviews. March 5, 2015; https://www.ncbi.nlm.nih.gov/books/NBK1303/.
- Pegoraro E and Hoffman EP. Limb-Girdle Muscular Dystrophy Overview. GeneReviews. August 30, 2012; https://www.ncbi.nlm.nih.gov/books/NBK1408/.
- Basil T Darras. Limb-girdle muscular dystrophy. UpToDate. Waltham, MA: UpToDate; February, 2016;
- Autosomal recessive limb-girdle muscular dystrophy type 2B. Orphanet. https://www.orpha.net/consor/cgi-bin/OC_Exp.php?lng=EN&Expert=268. Accessed 12/17/2017.
- Limb-Girdle Muscular Dystrophy (LGMD). Muscular Dystrophy Association (MDA). https://www.mda.org/disease/limb-girdle-muscular-dystrophy. Accessed 12/17/2017.
- Glenn Lopate. Limb-Girdle Muscular Dystrophy. Medscape Reference. October 28, 2014; https://emedicine.medscape.com/article/1170911-overview.