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Blood, 15 September 2006, Vol. 108, No. 6, pp. 2072-2080.
Prepublished online as a Blood First Edition Paper on May 23, 2006; DOI 10.1182/blood-2005-11-008151.
Previous Article | Next Article 
Submitted November 10, 2005
Accepted May 7, 2006
Evidence for subcomplexes in the Fanconi anaemia pathway
Annette L. Medhurst, El Houari Laghmani, Jurgen Steltenpool, Miriam Ferrer, Chantal Fontaine, Jan de Groot, Martin A. Rooimans, Rik J. Scheper, Amom Ruhikanta Meetei, Weidong Wang, Hans Joenje, and Johan P de Winter*
Dept of Clinical Genetics and Human Genetics, VU Medical Center, Amsterdam, The Netherlands
Dept of Medical Oncology, Division of Gene Therapy, VU Medical Center, Amsterdam, The Netherlands
Dept of Pathology VU Medical Center, Amsterdam, The Netherlands
Div Experimental Hematology, Cincinnati Children's Research Foundation, Cincinnati, Ohio, USA
5Laboratory of Genetics, National Institute of Aging, NIH, Baltimore, Maryland, USA
* Corresponding author; email: j.dewinter{at}vumc.nl.
Fanconi anaemia (FA) is a genomic instability disorder,
clinically characterised by congenital abnormalities,
progressive bone marrow failure and predisposition to
malignancy. Cells derived from FA patients display a
marked sensitivity to DNA cross-linking agents, such as
mitomycin C (MMC). This observation has led to the
hypothesis that the proteins defective in FA are
involved in the sensing or repair of interstrand cross-
link lesions of the DNA. A nuclear complex consisting of
a majority of the FA proteins plays a crucial role in
this process and is required for the monoubiquitination
of a downstream target, FANCD2. Two new FA genes, FANCB
and FANCL, have recently been identified and their
discovery has allowed a more detailed study into the
molecular architecture of the FA pathway. We demonstrate
a direct interaction between FANCB and FANCL and that a
complex of these proteins binds FANCA. The interaction
between FANCA and FANCL is dependent on FANCB, FANCG and
FANCM, but independent of FANCC, FANCE and FANCF. These
findings provide a framework for the protein
interactions that occur " upstream" in the FA pathway and
suggest that besides the FA core complex different
subcomplexes exist that may have specific functions
other than the monoubiquitination of FANCD2.

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