Definitions

ETS factors

ETS transcription factor family

In the field of molecular biology, the ETS family is one of the largest families of transcription factors and is unique to metazoans. There are 27 genes in humans, 26 in the mouse, 10 in Caenorhabditis elegans and 9 in Drosophila. The founding member of this family was identified as a gene transduced by the leukemia virus, E26.

Subfamilies

The ETS family is divided into 11 subfamilies, which are listed below:

Subfamily Members and their homologs
ELF ELF1, NERF/ELF2, MEF/ELF4
ELG GABPα, ELG
ERG ERG, FLI1, FEV
ERF ERF/PE2, ETV3/PE1
ESE ESE1/ESX/ELF3, ESE2/ELF5, ESE3/EHF
ETS ETS1, ETS2, POINTED
PDEF PDEF/SPDEF/PSE
PEA3 PEA3/E1AF/ETV4, ERM/ETV5, ER81/ETV1, ER71/ETV2
SPI PU.1/SPI, SPIB, SPIC
TCF ELK1, SAP1/ELK4, NET/SAP2/ELK3, LIN
TEL TEL/ETV6, TEL2/ETV7, YAN

Structure

All ETS family members are identified through a highly conserved DNA binding domain, the ETS domain, which is a winged helix-turn-helix structure that binds to DNA sites with a central GGA DNA sequence. As well as DNA-binding functions, evidence suggests that the ETS domain is also involved in protein-protein interactions. There is limited similarity outside the ETS DNA binding domain.

Other domains are also present and vary from ETS member to ETS member, including the Pointed domain, a subclass of the SAM domain family.

Function

The ETS family is present throughout the body and is involved in a wide variety of functions including the regulation of cellular differentiation, cell cycle control, cell migration, cell proliferation, apoptosis (programmed cell death) and angiogenesis.

Multiple Ets factors have been found to be associated with cancer, such as through gene fusion. For example, the ERG ETS transcription factor is fused to the EWS gene, resulting in a condition called Ewing's sarcoma. The fusion of TEL to the JAK2 protein results in early pre-B acute lymphoid leukaemia.

Mode of action

Amongst members of the ETS family, there is extensive conservation in the DNA-binding ETS domain and, therefore, a lot of redundancy in DNA binding. It is thought that interactions with other proteins is one way in which specific binding to DNA is achieved. ETS factors act as transcriptional repressors, transcriptional activators, or both.

References

Further reading

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