Seung Chul Shin, Sung-Hee Kim, Hyejin You, Boram Kim, Aeri C. Kim,
Kyung-Ah Lee, Joo-Heon Yoon, Ji-Hwan Ryu, Won-Jae Lee
4 NOVEMBER 2011 VOL 334 SCIENCE
R3 So young Park/ prof. Sang Youl Rhee

substantial numbers of commensal microorganisms in the gut
in all metazoans

commensal microorganisms in the gut
◦ positive impacts across a wide range of host physiology,
including regulation of immunity and metabolism
◦ limitation of understanding
 technical difficulties associated with in-depth integrated
genetic analysis of both the microbes and the host
 to overcome these limitations
 used the combination of Drosophila and its commensal
Acetobacter as a model of host-microbe interaction to
perform a simultaneous genetic analysis of both host
and microbe in vivo

Examination of host growth rate and body size
◦ in the presence of the commensal microflora
◦ in the absence of the commensal microflora
PQQ-ADH activity  DILP induction insulin/
insulin-like growth factor signaling activation
PQQ-ADH  acetic acid production  affects host
physiology

In conclusions,
◦ The PQQ-ADH respiratory chain of the A. pomorum and insulin/
insulin-like growth factor signaling of the host interact to maintain
the gut microbe mutualism
◦ Bacterial PQQ-ADH is required, but not sufficient, to explain all of
the A. pomorum–mediated effects on host physiology, and host
signaling pathways, other than insulin/insulin-like growth factor
signaling, may also be modulated by gut bacteria