《细胞》[Cell]13年6月20日出版pdf全文

nero1981

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Volume 153, Issue 7
+ B& i7 ^% w' O2 @6 ]On the cover: The mealybug Planococcus citri is host to two bacterial ' l8 Z) R* S3 m( b, ?! _6 Y) @
endosymbionts with extremely tiny genomes. These symbionts, Tremblaya and ) h* x$ w+ ^. O7 G. E! r- t# M
Moranella, live exclusively in specialized insect cells. Remarkably,
3 C" P. f6 n* R( ?+ f( K0 Y+ oMoranella lives inside of Tremblaya; their relationship is the ( Y1 O" d7 r& }
only known bacteria-within-a-bacterium symbiosis. In this issue, Husnik et al.
, m4 W$ E, g- `! T(pp. 1567–1578) show that this layered symbiosis is enabled by genes that have % ^- ?: O3 [! S) e
been horizontally transferred to the insect genome from diverse, historical
4 y# t0 ?: r$ ~bacterial infections. These transferred genes are overexpressed in the insect
, {/ p9 r" E8 [: ^; s& V# @tissue housing Tremblaya and Moranella and seem to complement 8 ^$ l, N- R1 `9 x* C" ?0 S
several symbiont activities. Importantly, these results show that, although the
$ U0 ]! ]$ L3 {) ]& B- N7 YTremblaya genome rivals some organelles in terms of size and coding
3 T! [: P0 T! A5 |1 T, Tcapacity, it has not arrived at this state by transferring its own genes to the
& z- d/ g3 b2 D1 e4 g/ }host genome. Photograph by Alex Wild, University of Illinois.: u0 h: B4 q2 y3 ~' k

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