SSA is employed as a repair pathway when a double-strand break arises between direct repeat sequences in DNA . SSA involves single-strand resection, annealing of the repeats, flap removal, gap filling and ligation.
22.
PAIs are discrete genetic units flanked by direct repeats, insertion sequences or tRNA genes, which act as sites for recombination into the DNA . Cryptic mobility genes may also be present, indicating the provenance as transduction.
23.
As such, both wild type and epi-mutant variants contain identical sequences for FWA . Loss of methylation in direct repeats in the 5'region of the gene results in expression of FWA and subsequent prevention of proper flowering.
24.
Analysis of the type I-E system from " E . coli " demonstrated that the first direct repeat adjacent to the leader sequence, is copied, with the newly acquired spacer inserted between the first and second direct repeats.
25.
The transposon consists of a genetic sequence of interest that is flanked by inverted repeats ( IRs ) that themselves contain short direct repeats ( DR ) ( tandem arrowheads IR-DR in Figs . 1 and 2 ).
26.
Analysis of the type I-E system from " E . coli " demonstrated that the first direct repeat adjacent to the leader sequence, is copied, with the newly acquired spacer inserted between the first and second direct repeats.
27.
The right direct repeat terminus integrates within 5 to 41 human telomere repeats, and preferentially does so into the proximal end of chromosomes 9, 17, 18, 19, and 22, but has also occasionally been found in chromosomes 10 and 11.
28.
In other cases, it has been reported that an entire exon, exon 10, was removed due to a gross deletion mutation; the mechanism for this has been theorized to be a mispairing, because there is an exact direct repeat, CCACTG, within the gene.
29.
Excisions and inversions occur if the recombination takes place between two sites that are found on the same molecule ( intramolecular recombination ), and if the sites are in the same ( direct repeat ) or in an opposite orientation ( inverted repeat ), respectively.
30.
The "'direct repeat 1 ( dr1 ) element "'is an Rous sarcoma and Avian leukosis viruses ( Alpharetroviruses and Avian type C retroviruses ) . dr1 is required for efficient viral replication and is thought to be involved in genomic RNA packaging although this may not be its only role.
