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Jenna M. Lang edited Organism Identification using 16s rRNA gene sequence.md
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##Choosing an organism to sequence
JENNA WILL EXPAND THIS SECTION A choice of whether to sequence an organism based on these results depends on the project goal.
For example, How closely your isolate is related to an
identity organism with a sequenced genome might be completely irrelevant if you are interested in sequencing your isolate per se, perhaps because of
100% suggests that at least at where you found it or because of some interesting phenotype. If your goal is to increase the
16S level, phylogenetic diversity of available genome sequences, then sequencing the
candidate organism 200th E. coli genome is
very similar not the ideal approach to
what is already in achieve that goal. At the
database. However, many organisms vary greatly in gene content between strains and other extreme, if you have isolated an
additional genome may still organism that is only 80% identical to anything with a currently available genome, or that appears to be
informative. The alone on a long branch on your phylogenetic tree, then you have a good candidate to achieve your goal. Of course 80% is arbitrary, as is a “long” branch, but the current standard is to use
of a 97% 16S rRNA gene sequence
percent identity as a proxy for species delimitation in
bacteria bacteria. This is yet another arbitrary cutoff, and is
frequently debated in the field (\cite{Chan_2012}\cite{Drancourt_2005}\cite{Hanage_2006}\cite{Stackebrandt_2002}. Finally, you might be interested in increasing the genome sequences available for a
subject of some debate particular lineage, for example, to provide additional data for a comparative genomics project. In that case, and in
many others, the ideal number of close relatives and the
field. \cite{Chan_2012}\cite{Drancourt_2005}\cite{Hanage_2006}\cite{Stackebrandt_2002}. definition of “close,” will be unique to each project.