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LAMA2 gene
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

LAMA2 gene

The LAMA2 gene provides instructions for creating a vital protein subunit that maintains the stability and strength of muscle fibers.

Normal Function

The LAMA2 gene provides instructions for making a part (subunit) of certain members of a protein family called laminins. Laminin proteins are composed of three different subunits: alpha, beta, and gamma. The LAMA2 gene specifically provides instructions for the alpha-2 subunit.

This subunit combines with other subunits to form two specific proteins:

  • Laminin 2 (also known as merosin or laminin-211), formed with beta-1 and gamma-1 subunits.
  • Laminin 4 (also known as laminin-221), formed with beta-2 and gamma-1 subunits.

Laminins are located in the extracellular matrix, an intricate lattice of proteins in the spaces between cells. They regulate cell growth, motility, and adhesion, and are essential for forming basement membranes that support various tissues. In skeletal muscles, laminin 2 and laminin 4 bind to proteins in the extracellular matrix and muscle cell membranes, maintaining the stability of muscle fibers.

Health Conditions Related to Genetic Changes

LAMA2-related muscular dystrophy

More than 100 mutations in the LAMA2 gene have been identified in individuals with LAMA2-related muscular dystrophy, a disorder characterized by the weakness and wasting (atrophy) of skeletal muscles. This condition generally presents in two forms:

  • Severe, early-onset type: Usually results from the absence of the functional laminin alpha-2 subunit.
  • Milder, late-onset form: Usually results from a reduction (deficiency) of the functional laminin alpha-2 subunit.

The deficiency or absence of this subunit leads to a lack of laminin 2 and laminin 4, which reduces the strength and stability of muscle tissue.

Other Conditions

The LAMA2 gene has also been associated with Cholangiocarcinoma and Limb-girdle muscular dystrophy.

Frequently Asked Questions

Testing typically uses next‑generation sequencing panels for muscular dystrophies or whole‑exome sequencing to detect pathogenic variants in the LAMA2 gene. The type of mutation (null vs. hypomorphic) can predict disease severity—null mutations usually lead to severe, early‑onset forms, while partial loss of function may result in milder, later‑onset disease.
Infants may show delayed motor milestones such as sitting or standing, persistent hypotonia (low muscle tone), and difficulty with head control. They might also have a characteristic “floppy” gait and frequent falls. Early signs often prompt referral to a pediatric neurologist or geneticist.
Current options include supportive care such as physical therapy, orthotic devices, and respiratory monitoring. Experimental therapies, such as gene‑replacement vectors or exon‑skipping strategies, are in clinical trials and may become available in the future. Early enrollment in research studies can provide access to emerging treatments.
Regular, low‑impact exercises—like swimming, gentle stretching, and resistance training—can strengthen muscles without overloading them. A multidisciplinary team should tailor a program that includes core strengthening, gait training, and balance exercises. Additionally, monitoring for scoliosis and using braces or surgical interventions when needed can preserve spinal alignment and improve quality of life.
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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