Table 2 Representative common nuclear targets of major signal transduction pathways

From: Epigenetic regulatory mechanisms in vertebrate eye development and disease

Signaling

TF

DNA-binding domain/consensus site (5′–3′)

Molecular mechanisms

Receptor tyrosine kinase (FGF-MAPK and Ras)

AP-1

bZIP TGA(G/C)T(C/A)A

A/R; bind p300/CBP HATs

 

Ets

ETS GGA(A/T)

For example, ETS-1, ETS-2, Elf1, and ER81 (bind p300/CBP HATs)

TGF-β/BMP

Smad2

MH1 GATC

Binds p300 and PCAF HATs and BRG1

 

Smad4

MH1 GATC

Binds p300/CBP HATs, forms complex with Smad2/3

Hedgehog

Gli2

ZnF GACCACCCA

 
 

Gli3

ZnF GACCACCCA

Binds p300/CBP HATs

Notch

RBPJ/CBF1/Su(H)

RHR GTG(A/R)GA(A/G)

A/R; binds PCAF and p300 HATs, and CtBP and NCOR2 co-repressors, makes complex with NICD of Notch

Wnt

LEF/TCF

HMG CTTTG(A/T)(A/T)

Binds β-catenin and p300 HAT

 

β-catenin

None

Binds LEF/TCF and p300/CBP HATs

 

CREB

bZIP TGACGT(A/C)(A/G)

Binds p300/CBP HATs

Nuclear receptorsa

RARα/β/γ

ZnF (A/G)G(G/T)TCAN1−5 (A/G)G(G/T)TCA

A/R, bind p300/CBP HATs, NCOA2/3/6, NCOR1/2

 

RXRα/β/γ

ZnF

A/R, bind p300/CBP HATs, NCOA2/3/6

 

TRβ2

ZnF AGGTCA

 
 

RORα/β

ZnFTAA(A/T)NTAAGGTCA

Binds p300/CBP HATs

  1. Abbreviations: bZIP, basic leucine zipper domain; ETS, E-twenty-six domain; HAT, histone acetyltransferase; HD, homeodomain; HMG, high-mobility group domain; HTH, helix-turn-helix domain; MH1, MAD homology region 1; NICD, Notch intracellular domain; RHR, Rel homology region; TF, transcription factor; ZnF, zinc-finger domain.
  2. a Additional information related to various arrangements of DNA-binding sites for nuclear receptors implicated in eye development can be found elsewhere (see Cvekl and Wang, 2009).