The N-terminal RASSF family: a new group of Ras-association-domaincontaining proteins, with emerging links to cancer formation

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Abstract
The RASSF (Ras-association domain family) has recently gained several new members and now contains ten proteins (RASSF1–10), several of which are potential tumour suppressors. The family can be split into two groups, the classical RASSF proteins (RASSF1–6) and the four recently added N-terminal RASSF proteins (RASSF7–10). The N-terminal RASSF proteins have a number of differences from the classical RASSF members and represent a newly defined set of potential Ras effectors. They have been linked to key biological processes, including cell death, proliferation, microtubule stability, promoter methylation, vesicle trafficking and response to hypoxia. Two members of the N-terminal RASSF family have also been highlighted as potential tumour suppressors. The present review will summarize what is known about the N-terminal RASSF proteins, addressing their function and possible links to cancer formation. It will also compare the N-terminal RASSF proteins with the classical RASSF proteins and ask whether the N-terminal RASSF proteins should be considered as genuine members or imposters in the RASSF family.

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