《细胞》[Cell]13年6月20日出版pdf全文

nero1981

8 _+ b" H0 l# v- I0 K7 G6 tVolume 153, Issue 7
; k) Y. U7 \/ C8 l& _( {0 h, YOn the cover: The mealybug Planococcus citri is host to two bacterial 3 T* g% C" F1 r( ~7 |$ Q* y+ K
endosymbionts with extremely tiny genomes. These symbionts, Tremblaya and
& C7 q' d/ A5 B8 c5 @# x* eMoranella, live exclusively in specialized insect cells. Remarkably,
8 K6 j8 v1 t- c4 B: QMoranella lives inside of Tremblaya; their relationship is the
+ |( z9 X4 p- g# Ronly known bacteria-within-a-bacterium symbiosis. In this issue, Husnik et al. ) [! Y0 q5 s. w! u5 Q
(pp. 1567–1578) show that this layered symbiosis is enabled by genes that have
( @( Z8 ], J# ~" L' ~# Y2 t2 fbeen horizontally transferred to the insect genome from diverse, historical : R" R) m6 Z( \& G% ]( W8 L& C2 c
bacterial infections. These transferred genes are overexpressed in the insect 0 m' Z: z  _. }  |
tissue housing Tremblaya and Moranella and seem to complement
* A: d( i8 t. f3 H3 J1 J( V  Tseveral symbiont activities. Importantly, these results show that, although the
) Q! }( a& z& @* p5 p4 H/ STremblaya genome rivals some organelles in terms of size and coding
% D  l+ _1 [$ ?( ]capacity, it has not arrived at this state by transferring its own genes to the 0 ^: v3 t: \4 V5 c/ b
host genome. Photograph by Alex Wild, University of Illinois.' A1 E" U" _! |9 V

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