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p73 Alternative Splicing: Exploring a Biological Role for the C-Terminal Isoforms

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journal contribution
posted on 12.10.2018, 11:13 by Polina Vikhreva, Gerry Melino, Ivano Amelio
p73 (encoded by TP73 gene) is a p53 related protein that functions as a transcriptional factor. Similarly to p53, following DNA damage, p73 is stabilized and activated and controls expression of target genes that are involved in the regulation of cycle arrest and apoptosis. However, great complexity to the function of this gene is given by the wide range of its non-tumor-related roles, which include neurological development, ciliogenesis and fertility. From the structural point of view, p73 displays an intricate range of regulations because it can be expressed both as an N-terminally deleted dominant-negative isoforms and as multiple alternatively spliced C-terminal isoforms, which can include or not a sterile alpha motif domain. More is known about the functions of the N-terminal isoforms of p73 (TAp73 and ΔNp73) and their opposing pro- and anti-apoptotic roles, whereas the functional differences of the distinct C-terminal splice forms of p73 are very far away from been defined. Here we summarize the current available literature regarding p73 C-terminal isoforms and the contribution of the sterile alpha motif domain to p73 function, trying to provide an unified view in this complex and sometime controversial field. Current data indicate that the full-length, TAp73α, is the major, if not the exclusive, isoform detected in physiological systems, indicating that detailed spatio-temporal expression analysis and functional studies are highly demanded to support a physiological role for the p73 alternative splicing. With this article, we also aim to emphasize the need to further investigation on the topic, refocusing the attention on what we believe are the most relevant unanswered questions.

Funding

This work has been funded by the UK Medical Research Council.

History

Citation

Journal of Molecular Biology, 2018, 430, pp. 1829–1838

Version

VoR (Version of Record)

Published in

Journal of Molecular Biology

Publisher

Elsevier for Academic Press

issn

0022-2836

eissn

1089-8638

Acceptance date

27/04/2018

Copyright date

2018

Available date

12/10/2018

Publisher version

https://www.sciencedirect.com/science/article/pii/S0022283618303450?via=ihub

Language

en

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