《细胞》[Cell]13年6月20日出版pdf全文

nero1981

8 [' T( u1 z! y5 ~; K, g/ J
Volume 153, Issue 7, O. C' z+ y$ I' ?: }
On the cover: The mealybug Planococcus citri is host to two bacterial . \* B1 K) q( v* z' |
endosymbionts with extremely tiny genomes. These symbionts, Tremblaya and + b5 J: O9 S7 C
Moranella, live exclusively in specialized insect cells. Remarkably,
$ T2 j, e8 U; e4 E* B  CMoranella lives inside of Tremblaya; their relationship is the
3 [% V+ Q+ K- ronly known bacteria-within-a-bacterium symbiosis. In this issue, Husnik et al.
9 r, C5 s$ \3 D(pp. 1567–1578) show that this layered symbiosis is enabled by genes that have 3 v& n0 R. T' ]
been horizontally transferred to the insect genome from diverse, historical
* Q* o# p  @) K+ Ibacterial infections. These transferred genes are overexpressed in the insect
3 h' z$ {5 n/ f0 n3 Ntissue housing Tremblaya and Moranella and seem to complement 3 x0 x1 t1 G# O: e& u' V
several symbiont activities. Importantly, these results show that, although the
) l% h8 s& c, A; {! m& `Tremblaya genome rivals some organelles in terms of size and coding " \: S, d; u( B" g
capacity, it has not arrived at this state by transferring its own genes to the - |5 O0 T+ _, U: o+ p
host genome. Photograph by Alex Wild, University of Illinois.
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