To overcome this limitation, we identified the reverse transcriptase (RT), integrase (IN), and protease (PR) domains in the pol gene of our high stringency sequences using Pfam domains [ 29].
For high stringency sequences (t>16), these two signals reach similar occurrences (a median of 0.7 sites) and appear to follow a similar slowly increasing trend as the EREs ([see Additional file 1], red and green profiles).
Orthologs were determined through high-stringency sequence homology matching using the program INPARANOID [56].This program searches for high stringency orthologous clusters between two protein sets, providing clusters of paralogs within species and orthologs across species.
By applying high-stringency sequence quality and transcript coverage filtering, high fidelity transcription data were recovered for more than 13000 transcripts.
Comparison of human sequences with sequences of other mammals, avians, reptiles, and teleost fish is valuable; in particular, teleosts offer maximal stringency for sequence comparisons among vertebrates.
In Mu transposition, the target DNA sites are selected with a low stringency of sequence specificity [15], yielding essentially random distribution of integrations along longer regions of DNA [14], [16].
These two options increased the stringency in sequence alignment.
The AR and PR can both recognize the low-stringency HRE sequence we used when tested in isolation [14], and the conserved HREs may mediate the effects of PR and AR in vivo.
The soil metagenomic DNA was targeted at four different probe hybridization stringencies and sequenced with high-throughput sequencing.
The stringency criteria for sequence similarity were defined with a mapping identity of ≥75% and a total sequence identity of ≥90% in a covered region ≥100 nt for interspecies searches and with ≥90% of total sequence identity and mapping identity in a covered region ≥100 nt for intraspecies searches.
Of the 8,457 unigenes, 97% mapped to the genome at high stringency (>80% sequence similarity; >80% unigene alignment length).
