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J. Cell Biol.,
Volume 141, Number 5, June 1, 1998 1277-1286



* Department of Medicine and Genetics, Lumican, a prototypic leucine-rich proteoglycan with keratan sulfate side chains, is a major
component of the cornea, dermal, and muscle connective tissues. Mice homozygous for a null mutation in lumican display skin laxity and fragility resembling certain types of Ehlers-Danlos syndrome. In addition, the
mutant mice develop bilateral corneal opacification.
The underlying connective tissue defect in the homozygous mutants is deregulated growth of collagen fibrils
with a significant proportion of abnormally thick collagen fibrils in the skin and cornea as indicated by transmission electron microscopy. A highly organized
and regularly spaced collagen fibril matrix typical of the
normal cornea is also missing in these mutant mice.
This study establishes a crucial role for lumican in the
regulation of collagen assembly into fibrils in various
connective tissues. Most importantly, these results provide a definitive link between a necessity for lumican in
the development of a highly organized collagenous matrix and corneal transparency.
Department of Genetics, § Department of Ophthalmology, and
Department of
Orthopaedics, Case Western Reserve University and University Hospitals of Cleveland, Cleveland, Ohio 44106-4952
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