Adult myogenesis in Drosophila melanogaster can proceed independently of myocyte enhancer factor-2.
Myocyte enhancer factor-2 (MEF2) is a transcription factor that is necessary for embryonic muscle development in Drosophila and vertebrates; however, whether this factor is required during later muscle development remains largely unknown. Using heteroallelic combinations of different Mef2 mutant alleles, we isolated and characterized a temperature-sensitive combination. Through temperature-shift experiments, we obtained adult animals that were lacking proper MEF2 function. Many of these individuals died as mature pupae, and those that eclosed showed poor locomotion and an inability to fly. Histological analysis of these animals revealed a requirement for MEF2 in skeletal muscle patterning, although these animals had strikingly normal amounts of muscle tissue. Using quantitative polymerase chain reaction, we determined that expression of the MEF2-regulated actin gene Act57B was severely reduced in these animals. By contrast myofibrillar actin genes unique to the adult stage were only mildly affected. Since MEF2 mutant adults were still capable of forming muscle tissue, we conclude that MEF2 is required for the expression of only a subset of muscle structural genes in the adult. These results indicate that additional muscle-specific factors function to control the myogenesis of complex and diverse muscle in the adult.
Baker
Phillip W
PW
Department of Biology, University of New Mexico, Albuquerque, New Mexico 87131-1091, USA.
Tanaka
Kathleen K Kelly
KK
Klitgord
Niels
N
Cripps
Richard M
RM
D000483:Alleles; D000818:Animals; D030801:Animals, Genetically Modified; D003433:Crosses, Genetic; D029721:Drosophila Proteins / Q000235:genetics* / Q000378:metabolism*; D004331:Drosophila melanogaster / Q000196:embryology* / Q000235:genetics*; D004625:Embryo, Nonmammalian; D018507:Gene Expression Regulation, Developmental; D017344:Genes, Insect; D005816:Genetic Complementation Test; D006651:Histocytochemistry; D007150:Immunohistochemistry; D017403:In Situ Hybridization; D024510:Muscle Development; D018482:Muscle, Skeletal / Q000196:embryology / Q000378:metabolism; D009154:Mutation; D018006:Myogenic Regulatory Factors / Q000235:genetics* / Q000378:metabolism*; D016133:Polymerase Chain Reaction; D013696:Temperature; D019076:Transgenes
D029721:Drosophila Proteins; C499409:Mef2 protein, Drosophila; D018006:Myogenic Regulatory Factors