《细胞》[Cell]13年6月20日出版pdf全文

nero1981

' |1 o( q) n) q  fVolume 153, Issue 7; h( a# }, p8 G5 Q9 _% j
On the cover: The mealybug Planococcus citri is host to two bacterial 7 ~. N+ I2 p* x
endosymbionts with extremely tiny genomes. These symbionts, Tremblaya and - f% g( y% h! F
Moranella, live exclusively in specialized insect cells. Remarkably, / n0 q- i1 e! G# p! H4 R
Moranella lives inside of Tremblaya; their relationship is the - f7 n- T4 }0 d! e1 l
only known bacteria-within-a-bacterium symbiosis. In this issue, Husnik et al. 5 d, W7 ]' K* p4 O3 X
(pp. 1567–1578) show that this layered symbiosis is enabled by genes that have & x$ a$ G1 O' Z3 A: b
been horizontally transferred to the insect genome from diverse, historical 9 J  R/ H% I. c2 m
bacterial infections. These transferred genes are overexpressed in the insect $ N1 {1 M( ^( ?
tissue housing Tremblaya and Moranella and seem to complement ( X% p8 H, G' W
several symbiont activities. Importantly, these results show that, although the
% c% i5 h8 `9 V0 Q; e7 o: q+ O4 WTremblaya genome rivals some organelles in terms of size and coding ' H( |9 m) `7 R
capacity, it has not arrived at this state by transferring its own genes to the
2 f" u& B% o+ G5 H/ a3 c$ uhost genome. Photograph by Alex Wild, University of Illinois.
5 z5 I1 p+ K  \4 H

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