Table 1. Selected gene expression changes in S. oneidensis – biofilm on electrode versus planktonic culture in anode chamber.

Extracellular electron transfer pathway – MTR pathway
Gene	Function	log2(fold change)
cymA	Membrane anchored tetraheme cytochrome c	0.73
mtrA	Extracellular iron oxide respiratory system periplasmic decaheme cytochrome c component	2.65
mtrC	Extracellular iron oxide respiratory system surface decaheme cytochrome c component	0.75
omcA	Extracellular iron oxide respiratory system surface decaheme cytochrome c component	1.39
mtrB	Extracellular iron oxide respiratory system outer membrane component	2.72
Extracellular electron transfer pathway – Flavin biosynthesis
Gene	Function	log2(fold change)
fccA	Periplasmic fumarate reductase	0.78
frdA	Quinol:fumarate reductase FAD-binding subunit	0.97
SO 3468	Riboflavin synthase alpha subunit RibC-like protein	4.11
ribE	Riboflavin synthase beta subunit RibE	1.26
Formate dehydrogenase genes
Gene	Function	log2(fold change)
fdhA	Formate dehydrogenase	3.03
fdhB	Formate dehydrogenase	5.81
fdhT	Formate dehydrogenase	1.23
fdhX	Formate dehydrogenase	6.75

Note: Samples were collected from three biological replicates.

p value less than 0.05 were considered significant.