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A de novo RYR1 variant may be pathogenic in a newborn with severe hypotonia and respiratory failureNewborn's rare gene variant linked to severe muscle weakness

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Key Takeaway
Note that a de novo RYR1 variant may be pathogenic in infants presenting with severe hypotonia and respiratory failure.

This case report describes a newborn infant presenting with severe generalized hypotonia, persistent respiratory failure, hypocalcemia, chylothorax, congenital fractures, arthrogryposis, macrocephaly, and cryptorchidism. The clinical presentation overlapped with the phenotype of RYR1-related myopathy. Genetic testing identified a de novo variant of uncertain significance (VUS) in the RYR1 gene (c.14564T>G).

The authors suggest that the overlap between the infant's clinical presentation and the known features of RYR1-related myopathy provides evidence supporting the pathogenicity of the identified VUS. The report aims to provide evidence for the reclassification of this specific variant from a VUS to a pathogenic classification.

Due to the nature of this report as a single case, the evidence is limited and cannot be generalized to a broader population. The variant is currently classified as a VUS in clinical databases. Clinicians should interpret these findings with caution when managing patients with similar neuromuscular presentations and genetic findings.

When a baby is born with severe muscle weakness and trouble breathing, doctors face a mystery. This case report describes one such newborn who also had low calcium, a collection of fluid around the lungs, and several other health issues. After genetic testing, doctors found a change in a gene called RYR1, which is known to cause muscle problems. However, this specific change is so rare that experts aren't sure yet if it's harmful.

The infant's symptoms were very similar to those seen in RYR1-related myopathy, a group of disorders that affect muscle strength. This similarity gives doctors a clue that the gene change might be the cause. But because this is just one case, it's too early to say for sure. The baby also received therapeutic hypothermia, a treatment that cools the body to protect the brain after a lack of oxygen at birth. It's unclear if this treatment played a role in the symptoms.

This report is important because it adds to our knowledge about rare gene changes and how they might affect newborns. The hope is that by sharing this case, other doctors might recognize similar patterns in their patients. But remember, this is a single case, not a large study. More research is needed to understand this gene change better and what it means for other families.

If your child has similar symptoms, talk to your doctor. They can help you understand genetic testing and what the results might mean for your family.

What this means for you:
A single newborn case links a rare RYR1 gene change to severe muscle weakness, but more evidence is needed.

Common questions

What is RYR1-related myopathy?

RYR1-related myopathy is a group of muscle disorders caused by changes in the RYR1 gene. These disorders can cause muscle weakness, breathing problems, and other symptoms. In this case, a newborn had symptoms similar to this condition, but the specific gene change found is not yet confirmed to be harmful.

What does 'variant of uncertain significance' mean?

A variant of uncertain significance (VUS) is a change in a gene that doctors aren't sure causes disease. It's not common enough or well-studied enough to know for sure. In this case, the newborn had a VUS in the RYR1 gene, and because the symptoms matched RYR1-related myopathy, it might be harmful, but more research is needed.

Who does this case report help?

This case report helps doctors and researchers who care for newborns with severe muscle weakness and other unexplained symptoms. It shows that genetic testing can find rare gene changes that might explain such cases. However, because it's just one case, it's not enough to change medical practice yet. If you have concerns about your child, talk to your doctor.

Study Details

Study typeSystematic review
EvidenceLevel 1
PublishedSep 2026
View Original Abstract ↓
Pathogenic variants in the Ryanodine Receptor 1 (RYR1) gene represent the most common cause of congenital myopathy. The severity of RYR1-related myopathy presenting in the neonatal period is quite variable, ranging from a perinatal lethal type to a benign late-onset form with progressive improvement. We report a newborn infant who presented at birth with severe hypoxic ischemic encephalopathy (HIE), underwent therapeutic hypothermia (TH), and was later diagnosed with RYR1-related myopathy. Exome sequencing identified a de novo variant of uncertain significance (VUS) in the RYR1 gene (c.14564T>G). The clinical course of the patient was complicated by severe generalized hypotonia, persistent respiratory failure requiring mechanical ventilation, hypocalcemia, chylothorax, and eventual redirection of care with death at 1 month of life. The infant's phenotype included congenital fractures, arthrogryposis, macrocephaly, and cryptorchidism. The phenotype overlapped with the clinical findings of RYR1-related myopathy, providing evidence supportive of the pathogenicity of the identified VUS. Our report aims to be the first step in generating evidence for the reclassification of this VUS. We also review the literature on the spectrum of neonatal presentations and outcomes of RYR1-related myopathy, with particular emphasis on HIE, and discuss the role of TH in infants with underlying congenital or genetic disorders.
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