Hypoglycosylation of alpha-dystroglycan

What it means

A reduction in the degree of glycosylation of alpha-dystroglycan in muscle tissue.

Alpha-dystroglycan is a component of the Dystrophin Associated Protein complex (DAP) which binds to various ligands in the extracellular matrix of muscle and other tissues, including laminin-alpha2, perlecan, neurexin and agrin. Disruption of the interaction between alpha-dystroglycan and its ligands has severe consequences for muscle and brain function and structure. The pathological hallmark is reduced immunolabeling of skeletal muscle with antibodies recognizing glycosylated epitopes on alpha-dystroglycan. {xref="PMID:18691338"}

Rare diseases that can present with this5

The range is how often this sign appears among people diagnosed with each disease — it is not a probability of having any of them. Many of these signs also occur in common, non-rare conditions. A sign on this page is a conversation to have with a clinician, not a conclusion.

Part of the broader category