PMID:22037604

Citation	Kelemen-Valkony, I, Kiss, M, Csiha, J, Kiss, A, Bircher, U, Szidonya, J, Maróy, P, Juhász, G, Komonyi, O, Csiszár, K and Mink, M (2012) Drosophila basement membrane collagen col4a1 mutations cause severe myopathy. Matrix Biol. 31:29-37
Abstract	Recent data from clinical and mammalian genetic studies indicate that COL4A1 mutations manifest with basement membrane defects that result in muscle weakness, cramps, contractures, dystrophy and atrophy. In-depth studies of mutant COL4A1-associated muscle phenotype, however, are lacking and significant details of the muscle-specific pathomechanisms remain unknown. In this study, we have used a comprehensive set of Drosophila col4a1 and col4a2 mutants and a series of genetic and mutational analyses, gene, protein expression, and immunohistochemistry experiments in order to establish a Drosophila model and address some of these questions. The Drosophila genome contains two type IV collagen genes, col4a1 and col4a2. Mutant heterozygotes of either gene are viable and fertile, whereas homozygotes are lethal. In complementation analysis of all known mutants of the locus and a complementation matrix derived from these data we have identified the dominant lesions within the col4a1, but not within the col4a2 gene. Expression of a col4a1 transgene partially rescued the dominant and recessive mutant col4a1 alleles but not the col4a2 mutations that were all recessive. Partial complementation suggested that col4a1 gene mutations have strong antimorph effect likely due to the incorporation of the mutant protein into the triple helix. In col4a1 mutants, morphological changes of the oviduct muscle included severe myopathy with centronuclear myofibers leading to gradual development of female sterility. In larval body wall muscles ultrastructural changes included disturbance of A and I bands between persisting Z bands. In the most severely affected DTS-L3 mutant, we have identified four missense mutations within the coding region of the col4a1 gene two of which affected the Y within the Gly-X-Y unit and a 3' UTR point mutation. In conclusion, our Drosophila mutant series may serve as an effective model to uncover the mechanisms by which COL4A1 mutations result in compromised myofiber-basement membrane interactions and aberrant muscle function.
Links	PubMed Online version:10.1016/j.matbio.2011.09.004
Keywords	Animals; Basement Membrane/metabolism; Collagen Type IV/genetics; Collagen Type IV/metabolism; Disease Models, Animal; Drosophila; Female; Heterozygote; Homozygote; Muscular Diseases/genetics; Muscular Diseases/pathology; Mutant Proteins/genetics; Mutant Proteins/metabolism; Mutation/genetics; Phenotype
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Annotations

Gene product	Qualifier	GO Term	Evidence Code	with/from	Aspect	Extension	Notes	Status
DROME:CO4A1	involved_in	GO:0035848: oviduct morphogenesis	ECO:0000315: mutant phenotype evidence used in manual assertion		P		Seeded From UniProt	complete

References

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