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M9480485.TXT
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1994-08-20
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Document 0485
DOCN M9480485
TI The Drosophila tom retrotransposon encodes an envelope protein.
DT 9410
AU Tanda S; Mullor JL; Corces VG; Department of Biology, Johns Hopkins
University, Baltimore,; Maryland 21218.
SO Mol Cell Biol. 1994 Aug;14(8):5392-401. Unique Identifier : AIDSLINE
GENBANK/Z24451
AB The tom transposable element of Drosophila ananassae is mobilized with
high frequency in the germ line of females from the ca; px strain, and
its insertion results in mutations that show almost exclusively dominant
eye phenotypes. tom is a long terminal repeat-containing retrotransposon
that encodes three different open reading frames (ORFs). It is expressed
in the nurse cells during oogenesis, in the central and peripheral
nervous systems during embryonic development, and in the imaginal discs
of the larva. tom RNA accumulates in the germarium of ovaries from ca;
px females but not in the parental inactive strain, suggesting that this
altered pattern of tom expression might be the cause of the high rate of
mobilization of this retrotransposon. The specificity of tom-induced eye
phenotypes can be explained by the presence of regulatory sequences
responsible for expression of tom in the eye imaginal discs of
third-instar larvae. These sequences might cause overexpression of
adjacent genes affected by tom-induced mutations, resulting in the death
of undifferentiated cells located anterior to the morphogenetic furrow.
In addition to the full-length RNA, tom is also transcribed into a
spliced subgenomic transcript that encodes a protein resulting from the
fusion between the amino-terminal region of the first (gag) and the
third ORFs. The protein encoded by this RNA shows structural
characteristics such as a signal peptide, glycosylation sites,
endopeptidase cleavage site, and fusion peptide that are typical of the
envelope proteins of retroviruses. Antibodies against tom ORF3 recognize
two different proteins present in female ovaries, suggesting that tom
might be able to form infective viral particles that could play a role
in the horizontal transmission of this retrotransposon.
DE Amino Acid Sequence Animal Base Sequence Drosophila
melanogaster/GROWTH & DEVELOPMENT/*GENETICS *DNA Insertion Elements
*Gene Expression Regulation *Genes, env Genes, Structural, Insect In
Situ Hybridization Molecular Sequence Data Morphogenesis Oogenesis
Open Reading Frames Restriction Mapping Support, Non-U.S. Gov't
Tissue Distribution Viral Envelope Proteins/GENETICS JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).