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First published online 30 June 2009
doi: 10.1242/jcs.050880

Journal of Cell Science 122, 2623-2631 (2009)
Published by The Company of Biologists 2009
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Research Article

Troponin I and Tropomyosin regulate chromosomal stability and cell polarity

Virender Kumar Sahota*, Benjamin Filip Grau, Alicia Mansilla and Alberto Ferrús{ddagger}

Cajal Institute, CSIC, Dr Arce 37, Madrid 28002, Spain

{ddagger} Author for correspondence (e-mail: aferrus{at}cajal.csic.es)

Accepted 28 April 2009

The Troponin-Tropomyosin (Tn-Tm) complex regulates muscle contraction through a series of Ca2+-dependent conformational changes that control actin-myosin interactions. Members of this complex in Drosophila include the actin-binding protein Troponin I (TnI), and two Tropomyosins (Tm1 and Tm2), which are thought to form heterodimers. We show here that pre-cellular embryos of TnI, Tm1 and Tm2 mutants exhibit abnormal nuclear divisions with frequent loss of chromosome fragments. During cellularization, apico-basal polarity is also disrupted as revealed by the defective location of Discs large (Dlg) and its ligand Rapsynoid (Raps; also known as Partner of Inscuteable, Pins). In agreement with these phenotypes in early development, on the basis of RT-PCR assays of unfertilized eggs and germ line mosaics of TnI mutants, we also show that TnI is part of the maternal deposit during oogenesis. In cultures of the S2 cell line, native TnI is immunodetected within the nucleus and immunoprecipitated from nuclear extracts. SUMOylation at an identified site is required for the nuclear translocation. These data illustrate, for the first time, a role for TnI in the nucleus and/or the cytoskeleton of non-muscle cells. We propose that the Tn-Tm complex plays a novel function as regulator of motor systems required to maintain nuclear integrity and apico-basal polarity during early Drosophila embryogenesis.

Key words: Troponin-Tropomyosin complex, Muscle, SUMOylation, Aneuploidy, Drosophila


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JCS 2009 122: 1503. [Full Text]  



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V. K. Sahota, B. F. Grau, A. Mansilla, and A. Ferrus
Troponin I and Tropomyosin regulate chromosomal stability and cell polarity
Development, August 15, 2009; 136(16): e1 - e1.
[Full Text]


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