Project description:RNA-Seq data were targeted for de novo assembly and reconstruction of full-length mouse transcripts. Sequencing of RNA taken from unstimulated DCs.
Project description:we applied RNA-seq to detect novel expressed transcripts in 12 tissues of giant pandas, using a transcriptome reconstruction strategy combining reference-based and de novo methods. Then we used mass spectrometry method to identify proteomes of five selected tissues, aiming at validating these novel full-length genes we identified.
Project description:NGPS is a method for de-novo, full-length protein sequencing in high throughput. The method is based on cleavage of the protein at semi-random sites by microwave-assisted acid hydrolysis (MAAH), enrichment of LC-MS/MS amenable peptides from the hydrolysate by solid-phase-extraction, LC-MS/MS analysis, de-novo long peptide tag sequencing of resulting peptides and assembly of peptide tags into consensus contigs.
Project description:We describe a new strategy for LC-MS/MS based full length protein sequencing. Protein samples were unspecific hydrolyzed by three different methods(proteinase K, papain and microwave-assisted acid hydrolysis) to improve overlapping degree of peptides. After LC-MS/MS analysis, peptide sequences were gernated by de novo peptide sequencing program Pnovo. A new sequence assembly program, based on de brujin graph and Overlap-Layout-Consensus strategy, was desined to generate full length protein sequence using Pnovo results.
Project description:Shotgun protein sequencing with meta-contig assembly.
Full-length de novo sequencing from tandem mass (MS/MS) spectra of unknown proteins such as antibodies or proteins from organisms with unsequenced genomes remains a challenging open problem. Conventional algorithms designed to individually sequence each MS/MS spectrum are limited by incomplete peptide fragmentation or low signal to noise ratios and tend to result in short de novo sequences at low sequencing accuracy. Our shotgun protein sequencing (SPS) approach was developed to ameliorate these limitations by first finding groups of unidentified spectra from the same peptides (contigs) and then deriving a consensus de novo sequence for each assembled set of spectra (contig sequences). But whereas SPS enables much more accurate reconstruction of de novo sequences longer than can be recovered from individual MS/MS spectra, it still requires error-tolerant matching to homologous proteins to group smaller contig sequences into full-length protein sequences, thus limiting its effectiveness on sequences from poorly annotated proteins. Using low and high resolution CID and high resolution HCD MS/MS spectra, we address this limitation with a Meta-SPS algorithm designed to overlap and further assemble SPS contigs into Meta-SPS de novo contig sequences extending as long as 100 amino acids at over 97% accuracy without requiring any knowledge of homologous protein sequences. We demonstrate Meta-SPS using distinct MS/MS data sets obtained with separate enzymatic digestions and discuss how the remaining de novo sequencing limitations relate to MS/MS acquisition settings.
Project description:The brown ghost knifefish (Apteronotus leptorhynchus) is a weakly electric teleost fish of particular interest as a model organism for a variety of research areas in neuroscience, including neurophysiology, neuroethology, and neurobiology. This versatile model system has been more recently used in the study of central nervous system development and regeneration during adulthood, as well as in the study of vertebrate aging and senescence. Despite substantial scientific interest in this species, no genomic resources are currently available. After evaluating several trimming and transcript reconstruction strategies, de novo assembly using Trinity uncovered at least 11,847 unique components (“genes”) containing full or near-full length protein sequences based on alignment to a reference set of known Actinopterygii protein sequences, with as many as 42,459 components containing at least a partial protein-coding sequence, providing broad coverage of the proteome. Shotgun proteomics confirmed translation of open reading frames from over 2,000 transcripts, including alternative splice variants. Assignment of tandem mass spectra obtained was shown to be greatly improved with the assembly compared with using databases of sequences from closely related organisms.
Project description:Purpose: The goal of this study is to screen the candidate genes involved in drought avoidance of Q. liaotungensis Methods:The Q. liaotungensis leaves were generated by deep sequencing, using Illumina Hiseq 4000. The high-quality reads were obtained by removing the reads that contained adaptor contamination, low quality bases and undetermined bases.The transcriptome were de novo assembly. Results:A total of 54153182 raw reads were obtained from Illumina sequencing platform, and 53021436 clean reads were generated after filtering out the low quality reads. The clean reads were assembled into 41207 transcripts with median length 704 and GC content 42.17%, and 25593 unigenes with median length 687 and GC content 42.31%, based on Trinity assembly platform Conclusions:RNA-Seq was applied to polyadenylate-enriched mRNAs from leaves of Q. liaotungensis to obtain the transcriptome. De novo assembly was then applied followed by gene annotation and functional classification. The SSRs and SNPs were also obtained using assembled transcripts as reference sequences. The results of this study lay the foundation for further research on genetic diversity of Quercus.
Project description:To generate novel genetic markers, we performed RNA sequencing of 10 accessions of Ae. tauschii. Transcripts were deduced from de novo assembly of short reads for each accession.
Project description:Purpose: The goal of this study is to provided a comprehensive genomic information for functional genomic studies in Q. mongolica. Methods:The Quercus mongolica leaves were generated by deep sequencing, using Illumina Hiseq 4000. The high-quality reads were obtained by removing the reads that contained adaptor contamination, low quality bases and undetermined bases.The transcriptome were de novo assembly. Results:A total of 52934562 raw reads were obtained from Illumina sequencing platform. After filtering out the low quality reads, we obtained 52076914 clean reads, which assembled into 39130 transcripts with a mean length of 742 bp and GC content of 42.12%, and 24196 unigenes with a mean length of 732 bp and GC content of 42.34%, based on Trinity assembly platform. Conclusions:RNA-Seq was applied to polyadenylate-enriched mRNAs from leaves of Q. mongolica to obtain the transcriptome. De novo assembly was then applied followed by gene annotation and functional classification. The SSRs and SNPs were also obtained using assembled transcripts as reference sequences. The results of this study lay the foundation for further research on genetic diversity of Quercus.
Project description:To better understand the transcriptome of Nucleus Accumbens (NAc) – a key brain reward region – under chronic cocaine treatment, we perform the first Iso-Seq analysis on its mRNAs to determine the full-length transcripts without assembly.