T-DNA-genome junctions form early after infection and are influenced by the chromatin state of the host genome.

Abstract:

:Agrobacterium tumefaciens mediated T-DNA integration is a common tool for plant genome manipulation. However, there is controversy regarding whether T-DNA integration is biased towards genes or randomly distributed throughout the genome. In order to address this question, we performed high-throughput mapping of T-DNA-genome junctions obtained in the absence of selection at several time points after infection. T-DNA-genome junctions were detected as early as 6 hours post-infection. T-DNA distribution was apparently uniform throughout the chromosomes, yet local biases toward AT-rich motifs and T-DNA border sequence micro-homology were detected. Analysis of the epigenetic landscape of previously isolated sites of T-DNA integration in Kanamycin-selected transgenic plants showed an association with extremely low methylation and nucleosome occupancy. Conversely, non-selected junctions from this study showed no correlation with methylation and had chromatin marks, such as high nucleosome occupancy and high H3K27me3, that correspond to three-dimensional-interacting heterochromatin islands embedded within euchromatin. Such structures may play a role in capturing and silencing invading T-DNA.

journal_name

PLoS Genet

journal_title

PLoS genetics

authors

Shilo S,Tripathi P,Melamed-Bessudo C,Tzfadia O,Muth TR,Levy AA

doi

10.1371/journal.pgen.1006875

subject

Has Abstract

pub_date

2017-07-24 00:00:00

pages

e1006875

issue

7

eissn

1553-7390

issn

1553-7404

pii

PGENETICS-D-17-00273

journal_volume

13

pub_type

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