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LARGE1 gene

Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

LARGE1 gene

The LARGE1 gene is critical for the glycosylation of alpha-dystroglycan, a process necessary for stabilizing muscle fibers and directing nerve cell migration.

Overview

The protein produced by the LARGE1 gene is located in the Golgi apparatus, where it performs a process called glycosylation. This involves adding sugar molecules to a protein called alpha (α)-dystroglycan. This modification is essential for the protein's function.

α-dystroglycan acts as an anchor, connecting the internal structural framework of a cell (the cytoskeleton) to the extracellular matrix outside the cell. In skeletal muscles, this connection stabilizes and protects muscle fibers. In the brain, it directs the migration of neurons during development.

Health Conditions Related to Genetic Changes

Walker-Warburg syndrome

Mutations in the LARGE1 gene can cause Walker-Warburg syndrome, the most severe form of congenital muscular dystrophy. This condition results in:

  • Skeletal muscle weakness
  • Brain abnormalities
  • Eye abnormalities

These mutations prevent the normal glycosylation of α-dystroglycan, meaning it can no longer anchor cells effectively. Without this stabilization, muscle fibers are damaged during contraction and eventually die. Additionally, defective α-dystroglycan disrupts neuronal migration, leading to cobblestone lissencephaly, where the brain surface appears bumpy and irregular rather than having normal folds.

Congenital muscular dystrophy type 1D (MDC1D)

LARGE1 mutations are also involved in congenital muscular dystrophy type 1D (MDC1D). This is a less severe form of the disorder that causes muscle weakness, intellectual disability, and brain abnormalities, but typically does not affect the eyes.

Genomic Location

The LARGE1 gene is found on chromosome 22.

Frequently Asked Questions

Parents may notice muscle weakness or delayed motor milestones such as sitting, standing, or walking. In some cases, eye abnormalities like cataracts or retinal detachment and distinctive facial features may appear early. If any of these signs are present, a pediatric neurologist or geneticist should evaluate the child for a possible LARGE1 mutation.
definitive diagnosis requires genetic testing, usually through a targeted gene panel for muscular dystrophy or whole-exome sequencing. Once a variant is identified, a laboratory may perform functional studies—such as assessing alpha‑dystroglycan glycosylation in cultured cells—to confirm pathogenicity.
There is no cure that corrects the underlying glycosylation defect. Management focuses on supportive care: physical therapy to maintain muscle strength, respiratory monitoring for weakness, and regular ophthalmologic exams for eye involvement. In some centers, experimental gene therapy trials are being explored, but these are still investigational.
Yes. Because LARGE1 mutations are inherited in an autosomal recessive pattern, both parents are typically carriers. Genetic counseling can guide carrier testing for siblings and future pregnancies, and prenatal testing or preimplantation genetic diagnosis can be offered if desired.
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.