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X-linked myotubular myopathy
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Condition

X-linked myotubular myopathy

X-linked myotubular myopathy is a severe congenital muscle disorder that primarily affects males, causing profound muscle weakness, hypotonia, and critical respiratory challenges.

Overview

X-linked myotubular myopathy is a condition that primarily affects muscles used for movement (skeletal muscles) and occurs almost exclusively in males. People with this condition have muscle weakness (myopathy) and decreased muscle tone (hypotonia) that are usually evident at birth. When viewed under a microscope, the muscle fibers of affected individuals are typically small and underdeveloped.

X-linked myotubular myopathy is the most severe condition in a group of disorders called centronuclear myopathy. In centronuclear myopathy, the nucleus is found at the center of many rod-shaped muscle cells instead of at either end, where it is normally located.

Symptoms

The muscle problems in X-linked myotubular myopathy impair the development of motor skills such as sitting, standing, and walking. Affected infants may experience a range of symptoms, including:

  • Difficulties with feeding due to muscle weakness
  • Inability to breathe regularly on their own, requiring support with a machine to help them get enough oxygen (mechanical ventilation)
  • Weakness in the muscles that control eye movement (ophthalmoplegia)
  • Weakness in other muscles of the face
  • Absent reflexes (areflexia)
  • Fragile bones, abnormal curvature of the spine, and joint deformities (contractures) of the hips and knees
  • A narrow and elongated face and a high-arched roof of the mouth (palate)
  • Recurrent ear and respiratory infections
  • Seizures
  • Liver disease, including a serious condition called peliosis hepatitis, which can cause life-threatening bleeding (hemorrhage)

Because of their severe breathing problems, individuals with X-linked myotub

Frequently Asked Questions

The most critical immediate concerns are severe breathing difficulties requiring mechanical ventilation and significant feeding problems due to muscle weakness. Parents should watch for any signs of respiratory distress, such as rapid or shallow breathing, grunting, or bluish discoloration, and difficulties with feeding, including poor sucking or swallowing, which can lead to aspiration.
Long-term challenges include ongoing feeding difficulties often requiring tube feeding, severe motor skill impairment, and the need for extensive physical and occupational therapy. Potential complications include recurrent respiratory infections, fragile bones and joint contractures, seizures, and liver disease, particularly peliosis hepatitis, which can cause life-threatening bleeding. Regular monitoring by a multidisciplinary medical team is essential to manage these issues.
X-linked myotubular myopathy is inherited in an X-linked recessive pattern, meaning it primarily affects males. Females can be carriers of the gene mutation without typically showing severe symptoms. A carrier mother has a 50% chance with each pregnancy of passing the mutation to her sons, who would be affected, and a 50% chance of passing it to her daughters, who would be carriers. Genetic counseling is recommended for families to understand their specific risks.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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