《细胞》[Cell]13年6月20日出版pdf全文

nero1981

3 ^/ J5 F: e! j7 x3 hVolume 153, Issue 78 _/ W. w0 J# e4 V0 u  ?9 o
On the cover: The mealybug Planococcus citri is host to two bacterial
; O4 s+ y% @7 `7 @7 B3 G% K" x/ Lendosymbionts with extremely tiny genomes. These symbionts, Tremblaya and
+ R- M' y/ e0 I4 k" Z- T2 w% QMoranella, live exclusively in specialized insect cells. Remarkably, 1 {- u' {. s8 _+ O3 d# c4 ]: _& |
Moranella lives inside of Tremblaya; their relationship is the
. ~$ c: q; q1 `# G* a' A  nonly known bacteria-within-a-bacterium symbiosis. In this issue, Husnik et al. - ]  J0 U0 ]- C' x+ O8 }& J
(pp. 1567–1578) show that this layered symbiosis is enabled by genes that have ' N( u1 `6 u6 I7 q: G
been horizontally transferred to the insect genome from diverse, historical
3 w/ E1 ~# E) O! m4 j8 lbacterial infections. These transferred genes are overexpressed in the insect ; T; q6 |) C7 P3 W3 G/ d
tissue housing Tremblaya and Moranella and seem to complement
4 C1 K- f2 U; C4 e0 C% ^several symbiont activities. Importantly, these results show that, although the " i: c: A. n, J) l4 i
Tremblaya genome rivals some organelles in terms of size and coding : s, `: v3 G2 i& i. X! D
capacity, it has not arrived at this state by transferring its own genes to the
- m. l/ a) f& ~& {1 j$ F7 k- L% Fhost genome. Photograph by Alex Wild, University of Illinois.
: M; l% f, |- r# v* Y( D( K

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