《细胞》[Cell]13年6月20日出版pdf全文

nero1981

7 a7 ]! L' f# d) u# b2 @+ x% o( |Volume 153, Issue 7
* t9 b- ~  q; z- H7 [: b# MOn the cover: The mealybug Planococcus citri is host to two bacterial 5 h5 E# I* h, p$ n$ Y# {; V
endosymbionts with extremely tiny genomes. These symbionts, Tremblaya and / T0 w4 ?1 w5 X; l( l
Moranella, live exclusively in specialized insect cells. Remarkably, 7 M3 q! `2 H6 j# Y5 O
Moranella lives inside of Tremblaya; their relationship is the
2 w0 n8 R& J; I9 s8 D7 Ronly known bacteria-within-a-bacterium symbiosis. In this issue, Husnik et al. - L& a  w$ @" e* k' i, h: C0 a
(pp. 1567–1578) show that this layered symbiosis is enabled by genes that have 2 h+ L  H( D+ V4 f, y0 k9 h! R
been horizontally transferred to the insect genome from diverse, historical 1 `# w& q' t2 Q  L! b: R9 Z8 k
bacterial infections. These transferred genes are overexpressed in the insect ( Z0 ?8 Z7 z) _: e' _3 h$ \
tissue housing Tremblaya and Moranella and seem to complement 8 O3 ~) Z: P" @+ {1 F/ n
several symbiont activities. Importantly, these results show that, although the
/ M. Z5 m) Z5 ?- q# B+ O* GTremblaya genome rivals some organelles in terms of size and coding
, V3 q; ?7 U, x6 H! i$ F/ wcapacity, it has not arrived at this state by transferring its own genes to the
  k, |. Z) X! h4 I# h, R3 A2 _9 khost genome. Photograph by Alex Wild, University of Illinois.$ D+ x* Q* i8 P1 t  L! k

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