Recessive mutations in multiple epidermal growth factor-like domains 10 (MEGF10) underlie a rare congenital muscle disease known as MEGF10 myopathy. MEGF10 and its Drosophila homolog Draper (Drpr) are transmembrane receptors expressed in muscle and glia. Drpr deficiency is known to result in muscle abnormalities in flies. In the current study, flies that ubiquitously overexpress Drpr, or mouse Megf10, display developmental arrest. The phenotype is reproduced with overexpression in muscle, but not in other tissues, and with overexpression during intermediate stages of myogenesis, but not in myoblasts. We find that tubular muscle subtypes are particularly sensitive to Megf10/Drpr overexpression. Complementary genetic analyses show that Megf10/Drpr and Notch may interact to regulate myogenesis. Our findings provide a basis for investigating MEGF10 in muscle development using Drosophila.
Bibliographical noteFunding Information:
We are particularly obliged to Mary Logan (OHSU) and Marc Freeman (OHSU) for their generous gift of the transgenic UAS-drpr-I, UAS-drpr-II, UAS-drpr-III, UAS-Megf10 and drpr null Drosophila lines used in these studies. We appreciate the thoughtful comments of Alan S. Kopin, as well as the expert technical assistance of Paul Spindler and Kelsey Bittner at the Department of Pathology and Laboratory Medicine, Tufts Medical Center. The genetic analyses were carried out with Gal4 driver stocks obtained from the Bloomington Drosophila Stock Center at Indiana University (NIH P40OD018537). FlyBase databases were utilized throughout the project to design experiments and interpret results. This work was supported in part by NIH R01NS080929.
© 2019 Federation of European Biochemical Societies
- MEGF10 myopathy