Staph Aureus and Rhodobacter

[rdeborja]

Can anyone tell me if staph aureus and rhodobacter are diploid or haploid?

[krobison]

I believe all bacteria are haploid in terms of allele content.

However, in rich medium, some bacteria are replicating very rapidly, and so the chromosome will appear to be at multiple copies near the origin of replication. I think this can be seen in sequencing depth plots, but can't remember where I saw it (unless it was in original Church sequencing-by-ligation paper)

[swbarnes2]

Yeah, I don't see why bacteria wouldn't be haploid.

But that doesn't mean that every sample given to you is clonal.

[ScottC]

Yes, theoretically, one chromosome copy per cell for (most) bacteria. But, as pointed out above, it doesn't always work that way.

[kant1_IC]

If you sequence with a large cover and a huge deepth, you'll be able to see different clones.
That does not mean that your bacteria is polyploid.