What are the best methods/programs for attempting to close gaps between scaffolds after a de novo assembly has resulted in a large number of scaffolds (before resorting to further sequencing)?
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First, I don't know why you've chosen to prefix all your posts with your username; not a desirable strategy.
Second, you've failed to describe any details about the genomes you are working on, the data you've acquired & how you've tried to assemble. The size & complexity of the genome are critical to understand as well what you have in hand and what scientific goals you really want to address.
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Okay, apologies for the previous comment.
There are a number of scaffolders out there, though I have used only SSPACE and without digging in much.
One thing that would benefit all of these programs is if there was a rigorous language for defining relationships that scaffolding might be based on. Ideally this would a XML; I know many folks aren't XML fans but the value of being able to validate inputs is powerful.
One distinction amongst scaffolders is their modularity. To give two examples, SSPACE is non-modular and must be run en masse. At the other extreme, SGA can apparently be used as a scaffolder & simply takes BAM files and a few parameters.
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