《细胞》[Cell]13年6月20日出版pdf全文

nero1981

7 V! A  Q5 m5 E) E  H
Volume 153, Issue 7
" n, q4 M/ s# A8 UOn the cover: The mealybug Planococcus citri is host to two bacterial
; G* G6 m3 \. d+ |endosymbionts with extremely tiny genomes. These symbionts, Tremblaya and
  n+ ~( l% |& ZMoranella, live exclusively in specialized insect cells. Remarkably, 4 W* X9 s  w. m! l& z9 d
Moranella lives inside of Tremblaya; their relationship is the
: Z- H' r) {! L5 S  h* P0 conly known bacteria-within-a-bacterium symbiosis. In this issue, Husnik et al.
# o9 X" M3 P; [2 z2 b8 c* K/ _(pp. 1567–1578) show that this layered symbiosis is enabled by genes that have ! c* ~- @# i7 S2 w
been horizontally transferred to the insect genome from diverse, historical
5 {# z) x- t, q- a" A  ?, w6 h+ bbacterial infections. These transferred genes are overexpressed in the insect
  g( g2 j  v8 o& w) r6 n4 D  Ltissue housing Tremblaya and Moranella and seem to complement ) ~3 Y7 x0 k. O! g
several symbiont activities. Importantly, these results show that, although the ; Z. f5 L( p- n* i$ s6 T
Tremblaya genome rivals some organelles in terms of size and coding # j$ n5 h9 _$ i* \* u  g. v
capacity, it has not arrived at this state by transferring its own genes to the 2 ^: h3 {* d. N( G
host genome. Photograph by Alex Wild, University of Illinois.6 e8 l0 ~. V5 M$ h, l& a

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