The completion of several sequencing projects provided abundant resources for mapping SDs in mammalian genomes.
Interestingly, ribonucleotide reductases are the most abundant enzyme family identified in metagenomic sequencing projects [ 39], and the potential utility of relating the biochemical attributes of RNRs to environmental parameters such as oxygen levels or iron availability is clear.
The feasibility of the genomics assembly and annotation components of this project derives from the demonstration that the entire human genome could be fragmented, the fragments sequenced, and the original sequence reconstructed from overlaps; that abundant sequencing capacity now exists in search of high-value projects; and that marine virologists have succeeded in parallel ventures.
Hundreds of genome sequencing projects have been completed [ 1], providing us with an abundant source of data to reconstruct phylogenetic relationships, but also with some novel problems in interpreting these data.
These are often the most conserved and most abundant sequences within the miRNA family that were identified in early and relatively small-scale sequencing projects.
Sequencing projects, such as Fantom3 for mouse and H-InvDB for human, have generated abundant data on transcribed components of mammalian cells, the majority of which appear not to be protein-coding.
In past sequencing projects using Sanger sequencing technology the main bottleneck was the sequencing itself.
In metagenomics sequencing projects, particularly for complex communities, gene calling is hampered by the fragmentation of the assembly that affects the genome of low abundant species producing also unassembled singletons.
For transcript sequencing projects with extreme variation in read depth the latter is not possible because, while the probability of a single base substitution might be quite small, the abundance of the most abundant reads easily compensates for this.
Insight gained from genome sequencing projects.
