Question 1

What is autosomal dominant childhood-onset proximal spinal muscular atrophy with contractures?

Accepted Answer

Autosomal dominant childhood-onset proximal spinal muscular atrophy with contractures is a neuromuscular disorder primarily affecting the muscles of the lower limbs. It is caused by pathogenic variants in the BICD2 gene, which is important for intracellular transport and muscle function. Affected children typically develop symptoms in early childhood, and the condition is extremely rare, affecting fewer than 1 in 1,000,000 individuals. The severity of symptoms varies from one individual to another.

Question 2

What are the symptoms of autosomal dominant childhood-onset proximal spinal muscular atrophy with contractures?

Accepted Answer

Individuals with this condition characteristically exhibit profound lower limb muscle weakness, with the proximal muscles being especially affected. A waddling gait, decreased Achilles reflex, and, in many cases, scapular winging and reduced patellar reflexes are common features. In addition, some patients may experience postexertional symptom exacerbation, lower limb amyotrophy, and the development of contractures, such as Achilles tendon contracture. Not all individuals experience every feature, and severity varies widely between affected individuals.

Question 3

What causes autosomal dominant childhood-onset proximal spinal muscular atrophy with contractures?

Accepted Answer

This condition is linked to pathogenic variants in the BICD2 gene, which plays a crucial role in intracellular transport and proper muscle function. It is inherited in an autosomal dominant pattern, meaning that the presence of a single altered copy of BICD2 is sufficient to cause the condition. As a result, an affected parent has a 50% chance of passing the variant to each child, although the severity and specific symptoms can differ significantly between family members due to variable expressivity. Associated genes include BICD2.

Question 4

How is autosomal dominant childhood-onset proximal spinal muscular atrophy with contractures inherited?

Accepted Answer

autosomal dominant childhood-onset proximal spinal muscular atrophy with contractures follows an autosomal dominant inheritance pattern. This means inheriting just one copy of the altered gene from either parent can cause the condition.

Question 5

How rare is autosomal dominant childhood-onset proximal spinal muscular atrophy with contractures?

Accepted Answer

autosomal dominant childhood-onset proximal spinal muscular atrophy with contractures is classified as very rare. The estimated prevalence is approximately <1 in 1,000,000. Because rare disease data can be limited, actual numbers may differ from published estimates.

Question 6

How is autosomal dominant childhood-onset proximal spinal muscular atrophy with contractures diagnosed?

Accepted Answer

Diagnosis is confirmed through molecular genetic testing that identifies pathogenic variants in the BICD2 gene. Clinical evaluation, including a detailed neuromuscular examination and family history, supports the diagnostic process. Because many neuromuscular features can overlap with other conditions, genetic testing is essential to definitively distinguish this condition from other disorders with similar presentations.

Question 7

Are there treatments for autosomal dominant childhood-onset proximal spinal muscular atrophy with contractures?

Accepted Answer

Management of this condition involves a multidisciplinary approach tailored to the patient's unique needs. FDA-approved treatments include SPINRAZA (nusinersen) and EVRYSDI (risdiplam), along with the FDA-approved gene therapy Zolgensma (onasemnogene abeparvovec-xioi), which may be considered for certain patients based on eligibility criteria. In addition to these targeted therapies, regular surveillance is an essential part of long-term care, with ongoing monitoring to detect changes in muscle strength, respiratory function, and the development of contractures. Patients are encouraged to work closely with their healthcare team and seek genetic counseling to better understand treatment options and implications for family planning. FDA-approved treatments include SPINRAZA, Zolgensma, EVRYSDI.

Question 8

What complications can arise from autosomal dominant childhood-onset proximal spinal muscular atrophy with contractures?

Accepted Answer

Complications from autosomal dominant childhood-onset proximal spinal muscular atrophy with contractures can include progressive muscle weakness, which may lead to difficulties in mobility and daily activities. Some individuals may also develop contractures, like Achilles tendon contracture, which can limit movement. Regular monitoring is important to manage these complications effectively.

Question 9

How does autosomal dominant childhood-onset proximal spinal muscular atrophy with contractures affect daily life?

Accepted Answer

Daily life for individuals with autosomal dominant childhood-onset proximal spinal muscular atrophy with contractures can be challenging due to muscle weakness, especially in the lower limbs. This may result in a waddling gait and difficulty with activities like walking or climbing stairs. Families often need to adapt their home environment and routines to support mobility and safety.

Question 10

What is the prognosis for someone with autosomal dominant childhood-onset proximal spinal muscular atrophy with contractures?

Accepted Answer

The prognosis for individuals with autosomal dominant childhood-onset proximal spinal muscular atrophy with contractures can vary widely. Some may maintain steady function over time, while others might experience gradual changes. With access to current treatments and therapies, many individuals can see improvements in their quality of life and function.

Question 11

What specialists should we consult for managing autosomal dominant childhood-onset proximal spinal muscular atrophy with contractures?

Accepted Answer

For managing autosomal dominant childhood-onset proximal spinal muscular atrophy with contractures, it is important to consult a team of specialists. This may include a neurologist, a physical therapist, and a genetic counselor. These professionals can help provide comprehensive care, monitor symptoms, and guide treatment options tailored to the individual's needs.

Organ System	Phenotype Count	Example Features
Muscles	10	Achilles tendon contracture, Hip contracture, Fasciculations
Brain and nerves	10	Steppage gait, Fasciculations, Lower limb spasticity
Arms and legs	7	Lower limb spasticity, Lower limb muscle weakness, Proximal lower limb muscle weakness
Bones and joints	3	Excessive inward curvature of the lower spine (hyperlordosis), Sideways curvature of the spine (scoliosis), Excessive outward curvature of the upper spine (kyphosis)
Lungs and breathing	2	Obstructive sleep apnea, Restrictive ventilatory defect
Lab test results	1	Elevated creatine kinase (muscle enzyme) (elevated circulating creatine kinase concentration)

Brand Name	Generic Name	Mechanism	Approved	Market Status
EVRYSDI	RISDIPLAM	—	2020	Available
Zolgensma	onasemnogene abeparvovec-xioi	—	2019	Available
SPINRAZA	NUSINERSEN	—	2016	Available

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autosomal dominant childhood-onset proximal spinal muscular atrophy with contractures

Overview

Clinical Presentation

Explore clinical features

Genetic Landscape

Diagnosis

Treatment

Approved Therapies

Clinical Trials

Prognosis

Research Landscape

Recent Publications

Medical References

External Resources

OMIM

Orphanet

GARD

Questions for Your Care Team

Questions for Your Care Team

FAQ

Frequently Asked Questions

autosomal dominant childhood-onset proximal spinal muscular atrophy with contractures

Overview

Clinical Presentation

Explore clinical features

Genetic Landscape

Diagnosis

Treatment

Approved Therapies

Clinical Trials

Prognosis

Research Landscape

Recent Publications

Medical References

External Resources

OMIM

Orphanet

GARD

Related Diseases

Questions for Your Care Team

Questions for Your Care Team

FAQ

Frequently Asked Questions

What is autosomal dominant childhood-onset proximal spinal muscular atrophy with contractures?

What are the symptoms of autosomal dominant childhood-onset proximal spinal muscular atrophy with contractures?

What causes autosomal dominant childhood-onset proximal spinal muscular atrophy with contractures?

How is autosomal dominant childhood-onset proximal spinal muscular atrophy with contractures inherited?

How rare is autosomal dominant childhood-onset proximal spinal muscular atrophy with contractures?

How is autosomal dominant childhood-onset proximal spinal muscular atrophy with contractures diagnosed?

Are there treatments for autosomal dominant childhood-onset proximal spinal muscular atrophy with contractures?

What complications can arise from autosomal dominant childhood-onset proximal spinal muscular atrophy with contractures?

How does autosomal dominant childhood-onset proximal spinal muscular atrophy with contractures affect daily life?

What is the prognosis for someone with autosomal dominant childhood-onset proximal spinal muscular atrophy with contractures?

What specialists should we consult for managing autosomal dominant childhood-onset proximal spinal muscular atrophy with contractures?