What does the exon junction complex do?
An exon junction complex (EJC) is a protein complex which forms on a pre-messenger RNA strand at the junction of two exons which have been joined together during RNA splicing. The EJC has major influences on translation, surveillance and localization of the spliced mRNA.
What is exon junction complexes EJCS?
The exon junction complex (EJC) is an RNA-binding protein complex that is assembled and deposited onto mRNAs during splicing. The EJC comprises four core components that bind to not only canonical sites upstream of exon–exon junctions, but also to noncanonical sites at other positions in exons.
Where do exon junction complexes bind?
The exon junction complex (EJC) is an RNA-binding protein complex that is assembled and deposited onto mRNAs during splicing. The EJC comprises four core components that bind to not only canonical sites upstream of exon-exon junctions, but also to noncanonical sites at other positions in exons.
What is Oskar gene?
oskar is a gene required for the development of the Drosophila embryo. It defines the posterior pole during early embryogenesis. Its two isoforms, short and long, play different roles in Drosophila embryonic development.
What is exon junction span?
“Span Exon Junction” implies the presence of reads with one end mapping to one exon, and the other end mapping to another exon, thus spanning the intermediate intron.
What does poly A binding protein do?
Abstract. Poly (A) tails are found at the 3′ ends of almost all eukaryotic mRNAs. They are bound by two different poly (A) binding proteins, PABPC in the cytoplasm and PABPN1 in the nucleus. PABPC functions in the initiation of translation and in the regulation of mRNA decay.
What does Oskar mRNA do?
The Drosophila oskar (osk) mRNA is unusual in that it has both coding and noncoding functions. As an mRNA, osk encodes a protein required for embryonic patterning and germ cell formation. Independent of that function, the absence of osk mRNA disrupts formation of the karyosome and blocks progression through oogenesis.
Which maternal protein is required for determination of the pole plasm germline during oogenesis?
GFP-Vas fusion protein
A GFP-Vas fusion protein enables the direct visualization of the pole plasm and germ cells in the living organism. During oogenesis, GFP-Vas accumulates at the oocyte posterior from stage 9 onward.
What is an exon-exon junction primer?
To selectively amplify cDNA from a mixture of cDNA and gDNA, the primers are designed such that at least one primer from a pair spans an exon junction. The primers are designed to anneal to mRNA or cDNA synthesized from it but not to genomic DNA.
What is exon junction primer?
Summary: ExPrimer is a web-based computer program to design primers mainly from a specified exon—exon junction (E-E-jn) of a gene of interest. The tool suggests the optimum primer-pair(s) of which the right (reverse) primer represents a particular E-E-jn of the mRNA.
What is a poly A signal sequence?
Poly(A) signals consist of short redundant sequences that are not restricted to mapped gene 3′ ends. This is particularly apparent in the yeast Saccharomyces cerevisiae, in which the poly(A) signals are made of poorly conserved sequence motifs flanking the cleavage site (28).
What is the function of eIF4G?
The eukaryotic initiation factor eIF4G is a large modular protein which serves as a docking site for initiation factors and proteins involved in RNA translation. Together with eIF4E and eIF4A, eIF4G constitutes the eIF4F complex which is a key component in promoting ribosome binding to the mRNA.
What is the Oskar gene?
What is an Oskar?
OSKAR stands for Outcome, Scale, Know-how, Affirm + Action, and Review.
What is required for the localization of the OSK RNPS to the posterior end of the oocyte?
oskar RNA localization to the posterior pole of the Drosophila melanogaster oocyte requires splicing of the first intron and the exon junction complex (EJC) core proteins.
What do the seven strips of the eve gene foreshadow?
In Drosophila, the pair-rule gene eve is expressed in a pattern of seven stripes during the syncytial blastoderm stage of development. This pattern foreshadows the mature segmented body plan and is regulated by five enhancers.
What is the advantage of having a primer binds to exon-exon junction?
the exon/exon junction primer will avoid DNA amplification in your RT-PCR. To be specific, for detection of certain spliced variants and avoid false positive signals coming from DNA contamination.
What are exon spanning primers?
Exon-exon junction: One primer sits on an exon-exon junction in mRNA. When performing gene expression analysis, this design approach will prevent unwanted signal from contaminating genomic DNA. Intron-spanning: Primers sit within different exons while spanning a large intron in the mRNA (intron is greater than 750bp).
What is a junction PCR?
Junction PCR analysis checks for correct donor integration. PCR was performed using one primer specific to the insert sequence and the other specific to the genomic sequences outside of the homology arms.
Why is poly-A tail important?
The polyA tail is a long chain of adenine nucleotides that is added to a mRNA molecule during RNA processing. The polyA tail makes the RNA molecule more stable and prevents its degradation and allows the mature mRNA molecule to be exported from the nucleus and translated into a protein by ribosomes in the cytoplasm.