An Epigenetic Trap Stabilizes Singular Olfactory Receptor Expression

Overview

Journal Cell

Publisher Cell Press

Specialty Cell Biology

Date 2013 Jul 23

PMID 23870122

Citations 96

Authors

David B Lyons

William E Allen

Tracie Goh

Lulu Tsai

Gilad Barnea

Stavros Lomvardas

Affiliations

Soon will be listed here.

Abstract

The molecular mechanisms regulating olfactory receptor (OR) expression in the mammalian nose are not yet understood. Here, we identify the transient expression of histone demethylase LSD1 and the OR-dependent expression of adenylyl cyclase 3 (Adcy3) as requirements for initiation and stabilization of OR expression. As a transcriptional coactivator, LSD1 is necessary for desilencing and initiating OR transcription, but as a transcriptional corepressor, it is incompatible with maintenance of OR expression, and its downregulation is imperative for stable OR choice. Adcy3, a sensor of OR expression and a transmitter of an OR-elicited feedback, mediates the downregulation of LSD1 and promotes the differentiation of olfactory sensory neurons (OSNs). This novel, three-node signaling cascade locks the epigenetic state of the chosen OR, stabilizes its singular expression, and prevents the transcriptional activation of additional OR alleles for the life of the neuron.

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