Systematic identification of cis-silenced genes by trans complementation.

Abstract:

:A gene's transcriptional output is the combined product of two inputs: diffusible factors in the cellular milieu acting in trans, and chromatin state acting in cis. Here, we describe a strategy for dissecting the relative contribution of cis versus trans mechanisms to gene regulation. Referred to as trans complementation, it entails fusing two disparate cell types and searching for genes differentially expressed between the two genomes of fused cells. Any differential expression can be causally attributed to cis mechanisms because the two genomes of fused cells share a single homogenized milieu in trans. This assay uncovered a state of transcriptional competency that we termed 'occluded' whereby affected genes are silenced by cis-acting mechanisms in a manner that blocks them from responding to the trans-acting milieu of the cell. Importantly, occluded genes in a given cell type tend to include master triggers of alternative cell fates. Furthermore, the occluded state is maintained during cell division and is extraordinarily stable under a wide range of physiological conditions. These results support the model that the occlusion of lineage-inappropriate genes is a key mechanism of cell fate restriction. The identification of occluded genes by our assay provides a hitherto unavailable functional readout of chromatin state that is distinct from and complementary to gene expression status.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Lee JH,Bugarija B,Millan EJ,Walton NM,Gaetz J,Fernandes CJ,Yu WH,Mekel-Bobrov N,Vallender TW,Snyder GE,Xiang AP,Lahn BT

doi

10.1093/hmg/ddn409

subject

Has Abstract

pub_date

2009-03-01 00:00:00

pages

835-46

issue

5

eissn

0964-6906

issn

1460-2083

pii

ddn409

journal_volume

18

pub_type

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