Published online before print
January 13, 2003, 10.1101/gr.214102. Article published online before print in January 2002
Vol. 12, Issue 2, 232-243, February 2002
Combining Mouse Congenic Strains and Microarray Gene Expression Analyses to Study a Complex Trait: The NOD Model of Type 1 Diabetes
Iain A.
Eaves,1
Linda S.
Wicker,2,5
Ghassan
Ghandour,3
Paul A.
Lyons,1
Laurence B.
Peterson,4
John A.
Todd,1,6 and
Richard J.
Glynne3
1 Juvenile Diabetes Research Foundation/ Wellcome Trust
(JDRF/WT) Diabetes and Inflammation Laboratory, Cambridge Institute for
Medical Research, University of Cambridge, Wellcome Trust/Medical
Research Council (MRC) Building, Addenbrooke's Hospital, Cambridge,
CB2 2XY, UK; 2 Department of Immunology and Rheumatology,
Merck Research Laboratories, Rahway, New Jersey 07065, USA;
3 Eos Biotechnology, Inc., South San Francisco, California
94080, USA; 4 Department of Pharmacology, Merck Research
Laboratories, Rahway, New Jersey 07065, USA
Combining congenic mapping with microarray expression profiling
offers an opportunity to establish functional links between genotype
and phenotype for complex traits such as type 1 diabetes (T1D). We used
high-density oligonucleotide arrays to measure the relative expression
levels of >39,000 genes and ESTs in the NOD mouse (a murine model of
T1D and other autoimmune conditions), four NOD-derived
diabetes-resistant congenic strains, and two nondiabetic control
strains. We developed a simple, yet general, method for measuring
differential expression that provides an objective assessment of
significance and used it to identify >400 gene expression differences
and eight new candidates for the Idd9.1 locus. We also
discovered a potential early biomarker for autoimmune hemolytic anemia
that is based on different levels of erythrocyte-specific transcripts
in the spleen. Overall, however, our results suggest that the dramatic
disease protection conferred by six Idd loci (Idd3,
Idd5.1, Idd5.2, Idd9.1, Idd9.2, and
Idd9.3) cannot be rationalized in terms of global effects on
the noninduced immune system. They also illustrate the degree to which
regulatory systems appear to be robust to genetic variation. These
observations have important implications for the design of future
microarray-based studies in T1D and, more generally, for studies that
aim to combine genome-wide expression profiling and congenic mapping.
[The supplemental research data accompanying this
article are available through the authors' web site
(http://www-gene.cimr.cam.ac.uk/todd/), and the array data have been
submitted to the GEO data repository (http://www.ncbi.nlm.nih.gov/geo/)
under accession no. GSE11]
5
Present address: JDRF/WT Diabetes and Inflammation
Laboratory, Cambridge Institute for Medical Research, University of
Cambridge, Wellcome Trust/MRC Building, Addenbrooke's Hospital,
Cambridge, CB2 2XY, UK
6
Corresponding author.
12:232-243 ©2002 by Cold Spring Harbor Laboratory Press ISSN 1088-9051/02 $5.00

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