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; ?! h% ?0 y, u6 vVolume 153, Issue 7- j6 x# H9 P6 e7 W( A8 B4 Q" k8 V- v
On the cover: The mealybug Planococcus citri is host to two bacterial ' E) X" i8 [# `" V3 f0 C
endosymbionts with extremely tiny genomes. These symbionts, Tremblaya and 5 Z1 H$ k; O3 n- K: _" X! v
Moranella, live exclusively in specialized insect cells. Remarkably,
: u% W% n6 k( A$ b8 X# J3 Q" aMoranella lives inside of Tremblaya; their relationship is the
3 ?8 B4 n2 }$ V" Monly known bacteria-within-a-bacterium symbiosis. In this issue, Husnik et al.
# w; G$ P, B0 Q( X+ r(pp. 1567–1578) show that this layered symbiosis is enabled by genes that have
5 a# F; e9 d. x% n: I3 d2 bbeen horizontally transferred to the insect genome from diverse, historical 2 V T @, L( n! ^" G
bacterial infections. These transferred genes are overexpressed in the insect : Z9 w2 G. }+ M' |2 V
tissue housing Tremblaya and Moranella and seem to complement
# j# F* C" W2 C6 _, s) \! Gseveral symbiont activities. Importantly, these results show that, although the
- i1 T# }) p+ _ zTremblaya genome rivals some organelles in terms of size and coding 6 I: C9 T% i6 G0 c' d
capacity, it has not arrived at this state by transferring its own genes to the
# R% ]* ]3 z- H7 h6 e% v" ~1 D0 Uhost genome. Photograph by Alex Wild, University of Illinois.
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发表于 2013-6-21 14:28
发表于 2013-6-21 15:06
