TY - JOUR
T1 - bicaudal encodes the Drosophila beta NAC homolog, a component of the ribosomal translational machinery
AU - Markesich, Diane C.
AU - Gajewski, Kathleen M.
AU - Nazimiec, Michael E.
AU - Beckingham, Kathy
N1 - Copyright:
Copyright 2007 Elsevier B.V., All rights reserved.
PY - 2000/2
Y1 - 2000/2
N2 - bicaudal was the first Drosophila mutation identified as producing mirror-image pattern duplications along the anteroposterior axis of the embryo. However the mutation has been little studied due to its low penetrance and suppressibility. We undertook cloning of the bicaudal locus together with studies of the mutation's effects on key elements of the posterior embryonic patterning pathway. Our mapping studies place the bicaudal mutation within a ~2 kb region, 3' to the protein coding sequence of the Drosophila homolog of beta NAC, a subunit of Nascent polypeptide Associated Complex (NAC). Genomic DNA encoding beta NAC completely rescues the bicaudal phenotype. The lethal phenotype of Enhancer of Bicaudal, E(Bic), a mutation hypothesized to affect the bicaudal locus, is also completely rescued by the beta NAC locus. We further demonstrate that the E(Bic) mutation is caused by a P element insertion into the transcribed region of the beta NAC gene. NAC is among the first ribosome-associated entities to bind the nascent polypeptide after peptide bond formation. In contrast to other bicaudal-embryo-producing mutations, bicaudal leads to ectopic translation of mRNA for the posterior determinant nanos, without affecting the localization of mRNA for its upstream regulator, oskar, in the embryo. These findings suggest that repression of nanos mRNA translation occurs on the ribosome and involves a role for beta NAC.
AB - bicaudal was the first Drosophila mutation identified as producing mirror-image pattern duplications along the anteroposterior axis of the embryo. However the mutation has been little studied due to its low penetrance and suppressibility. We undertook cloning of the bicaudal locus together with studies of the mutation's effects on key elements of the posterior embryonic patterning pathway. Our mapping studies place the bicaudal mutation within a ~2 kb region, 3' to the protein coding sequence of the Drosophila homolog of beta NAC, a subunit of Nascent polypeptide Associated Complex (NAC). Genomic DNA encoding beta NAC completely rescues the bicaudal phenotype. The lethal phenotype of Enhancer of Bicaudal, E(Bic), a mutation hypothesized to affect the bicaudal locus, is also completely rescued by the beta NAC locus. We further demonstrate that the E(Bic) mutation is caused by a P element insertion into the transcribed region of the beta NAC gene. NAC is among the first ribosome-associated entities to bind the nascent polypeptide after peptide bond formation. In contrast to other bicaudal-embryo-producing mutations, bicaudal leads to ectopic translation of mRNA for the posterior determinant nanos, without affecting the localization of mRNA for its upstream regulator, oskar, in the embryo. These findings suggest that repression of nanos mRNA translation occurs on the ribosome and involves a role for beta NAC.
KW - Beta NAC
KW - Drosophila
KW - Nascent polypeptide chain
KW - Oogenesis
KW - Pattern formation
KW - Translational control
UR - http://www.scopus.com/inward/record.url?scp=0033960927&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0033960927&partnerID=8YFLogxK
M3 - Article
C2 - 10631177
AN - SCOPUS:0033960927
SN - 0950-1991
VL - 127
SP - 559
EP - 572
JO - Development
JF - Development
IS - 3
ER -