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Table 1 Features of endosymbiont and organelle genomes. '*' – no genome of free-living relative, '?' – not determined.

From: Comparative rates of evolution in endosymbiotic nuclear genomes

Organism

Genome Compacted (compared to free-living relative)

AT bias

Codon Bias

Expression bias (highly expressed genes are less divergent and GC rich)

Divergent (compared to free-living relative)

Organelle genomes of prokaryotic origin

Mitochondria

Y

Y

Y

Y

Y

 

Plastids

Y

Y

Y

Y

Y

Prokaryotic obligate intracellular symbionts

Wolbachia

Y

Y

Y

Y

Y

 

Wigglesworthia

Y

Y

Y

Y

Y

 

Buchnera

Y

Y

Y

Y

Y

Organelle genomes of eukaryotic origin

Guillardia theta nm

Y

Y

?

?

Y

 

Bigelowiella natans nm

Y

Y

?

?

Y

Eukaryotic obligate Intracellular parasites

Plasmodium

-*

Y

Y

Y

-*

 

Toxoplasma

-*

Y

?

?

-*

 

Cryptosporidium

-*

No

?

?

-*

 

E. cuniculi

Y

No

?

?

Y