title: Silencing of drpr leads to muscle and brain degeneration in adult Drosophila.
abstract: Mutations in the gene encoding the single transmembrane receptor multiple epidermal growth factor-like domain 10 (MEGF10) cause an autosomal recessive congenital muscle disease in humans. Although mammalian MEGF10 is expressed in the central nervous system as well as in skeletal muscle, patients carrying mutations in MEGF10 do not show symptoms of central nervous system dysfunction. drpr is the sole Drosophila homolog of the human genes MEGF10, MEGF11, and MEGF12 (JEDI, PEAR). The functional domains of MEGF10 and drpr bear striking similarities, and residues affected by MEGF10 mutations in humans are conserved in drpr. Our analysis of drpr mutant flies revealed muscle degeneration with fiber size variability and vacuolization, as well as reduced motor performance, features that have been observed in human MEGF10 myopathy. Vacuolization was also seen in the brain. Tissue-specific RNAi experiments demonstrated that drpr deficiency in muscle, but not in the brain, leads to locomotor defects. The histological and behavioral abnormalities seen in the affected flies set the stage for further studies examining the signaling pathway modulated by MEGF10/Drpr in muscle, as well as assessing the effects of genetic and/or pharmacological manipulations on the observed muscle defects. In addition, the absence of functional redundancy for Drpr in Drosophila may help elucidate whether paralogs of MEGF10 in humans (eg, MEGF11) contribute to maintaining wild-type function in the human brain.
authors.affiliation: Department of Medicine, Molecular Cardiology Research Institute, Tufts Medical Center, Boston, Massachusetts. Electronic address: idraper@tuftsmedicalcenter.org.
authors.forename: Isabelle
authors.initials: I
authors.lastname: Draper
authors.affiliation: Department of Neurology, Boston Children's Hospital and Harvard Medical School, Boston, Massachusetts.
authors.forename: Lane J
authors.initials: LJ
authors.lastname: Mahoney
authors.affiliation: Department of Neurology, Boston Children's Hospital and Harvard Medical School, Boston, Massachusetts.
authors.forename: Satomi
authors.initials: S
authors.lastname: Mitsuhashi
authors.affiliation: Department of Anesthesia, Boston Children's Hospital and Harvard Medical School, Boston, Massachusetts; Child Health Research Institute, Department of Pediatrics, University of Florida College of Medicine, Gainesville, Florida.
authors.forename: Christina A
authors.initials: CA
authors.lastname: Pacak
authors.affiliation: Department of Pathology, Tufts Medical Center, Boston, Massachusetts.
authors.forename: Robert N
authors.initials: RN
authors.lastname: Salomon
authors.affiliation: Department of Neurology, Boston Children's Hospital and Harvard Medical School, Boston, Massachusetts; Division of Pediatric Neurology, Department of Pediatrics, University of Florida College of Medicine, Gainesville, Florida. Electronic address: pbkang@ufl.edu.
authors.forename: Peter B
authors.initials: PB
authors.lastname: Kang
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001921:Brain / Q000473:pathology; D004195:Disease Models, Animal; D004330:Drosophila / Q000235:genetics* / Q000378:metabolism; D029721:Drosophila Proteins / Q000235:genetics / Q000378:metabolism; D004815:Epidermal Growth Factor / Q000235:genetics / Q000378:metabolism; D020868:Gene Silencing; D006801:Humans; D008297:Male; D008565:Membrane Proteins / Q000235:genetics* / Q000378:metabolism; D008969:Molecular Sequence Data; D018482:Muscle, Skeletal / Q000473:pathology; D009135:Muscular Diseases / Q000235:genetics* / Q000473:pathology; D009154:Mutation; D016415:Sequence Alignment; D015398:Signal Transduction
chemical_list: D029721:Drosophila Proteins; D008565:Membrane Proteins; D004815:Epidermal Growth Factor
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