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Which animal/plant/anything has smallest length genome?

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2 Answers 2

up vote 34 down vote accepted

Since you said plant/animal/anything, I offer the smallest genomes in various categories...

(Kb means Kilobases, Mb means Megabases. 1 Kb = 1000 base pairs, 1Mb = 1000Kb)

Refs...

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Well done! How did you find these? –  leonardo Mar 12 '12 at 16:36
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The plant and bacterial ones I had floating around in my memory having read about them previously, so a bit of googling confirmed the names. The animal ones I got from the Animal Genome Size DB, and from Wikipedia. I guessed that viral genomes would be the smallest, so I also searched for the smallest viral genome. Then I went back to the literature (by searching Google Scholar for organism name + "genome size") to check all my facts and provide reliable references. –  Richard Smith-Unna Mar 12 '12 at 18:43
    
Nice answer Richard. –  Poshpaws Mar 13 '12 at 11:38

I want to say Mycoplasma genitalium with a genome size of 582,970 bp. Turns out the answer is Nanoarchaeum eqitans with a genome of 490,885 bp.

http://en.wikipedia.org/wiki/Nanoarchaeum

http://www.ncbi.nlm.nih.gov/pubmed/14566062

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That's the smallest genome of a free-living organism. And until 2003 you would have been right about Mycoplasma, which were previously the smallest known in that category. –  Richard Smith-Unna Mar 12 '12 at 0:38

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