As a control, the same protocol failed to connect the genome termini within the Mononegavirales, suggesting the circular genomic form is unique to the chuviruses.
Because recombination at these intermediate repeats is infrequent, the rearranged genomic forms are present at substoichiometric levels relative to the predominant genomic form, and the substoichiometric forms are often undetectable by southern blotting (fig. 2 B; Small et al. 1987; Janska et al. 1998; Tsumura et al. 2000; Shedge et al. 2007).
The circular genomic form, which was confirmed by 'around-the-genome' RT-PCR and by the mapping of sequencing reads to the genome, is a unique feature of the Chuviridae and can be distinguished from a pseudo-circular structure seen in some other negative-sense RNA viruses including the family Bunyaviridae and the family Orthomyxoviridae.
A 1452 bp DNA fragment corresponding to this truncated form, was amplified from genomic DNA of BY4742 strain using primers SM28 and SM29, digested with endonucleases BamHI and NotI and cloned into BamHI/NotI digested plasmid pUC57-delta1_2-ADHpr-PHO8-CYCt-kanMX.
To further address whether the formation of the 1.2 kb form is caused by genomic mutation, the genomic domain between exons 3 and 5 in HepG2 cells was extracted by PCR and sequenced.
For the self cleavage ribozyme in the human delta virus (HDV), both the genomic form and the antigenomic form are captured in the pseudoknot structure (Figs. 1b and c) [16].
Another issue is that of the "minimal genome": equating minimal genomes reconstructed by comparative-genomic approaches with ancestral life forms is incorrect and does not reflect the original view of the authors of the minimal genome notion (of which ref. 27 in the present manuscript is a proper reflection).
If the assembled genomic arrangement is the only genomic form within the single individual from each of the four species, we would expect two restriction fragments (consistent in size to the restriction maps in fig. 2 A) to hybridize with the IR probe.
Another company, Framingham Genomic Medicine, was formed in June by Boston University and venture capitalists to analyze data from a project that has collected data and DNA samples from thousands of people in Framingham, Mass.
