The Homeodomain Iroquois Proteins Control Cell Cycle Progression and Regulate the Size of Developmental Fields.

Abstract:

:During development, proper differentiation and final organ size rely on the control of territorial specification and cell proliferation. Although many regulators of these processes have been identified, how both are coordinated remains largely unknown. The homeodomain Iroquois/Irx proteins play a key, evolutionarily conserved, role in territorial specification. Here we show that in the imaginal discs, reduced function of Iroquois genes promotes cell proliferation by accelerating the G1 to S transition. Conversely, their increased expression causes cell-cycle arrest, down-regulating the activity of the Cyclin E/Cdk2 complex. We demonstrate that physical interaction of the Iroquois protein Caupolican with Cyclin E-containing protein complexes, through its IRO box and Cyclin-binding domains, underlies its activity in cell-cycle control. Thus, Drosophila Iroquois proteins are able to regulate cell-autonomously the growth of the territories they specify. Moreover, our results provide a molecular mechanism for a role of Iroquois/Irx genes as tumour suppressors.

journal_name

PLoS Genet

journal_title

PLoS genetics

authors

Barrios N,González-Pérez E,Hernández R,Campuzano S

doi

10.1371/journal.pgen.1005463

subject

Has Abstract

pub_date

2015-08-25 00:00:00

pages

e1005463

issue

8

eissn

1553-7390

issn

1553-7404

pii

PGENETICS-D-15-00602

journal_volume

11

pub_type

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