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CUTTING EDGE |





*
Section on Immunology and Immunogenetics, Joslin Diabetes Center, Harvard Medical School, Boston, MA 02215;
National Institute of Genetics, Mishima, Japan;
Whitehead Institute for Biomedical Research, Cambridge MA 02139;
§
Brigham and Womens Hospital, Harvard Medical School, Boston, MA 02115; and
¶
University College London, London, United Kingdom
| Abstract |
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| Introduction |
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| Materials and Methods |
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The NOD/Shi/Jos and B10.A(R209)/Msf/Jos mice were housed at Joslin Diabetes Center Animal Facility (Boston, MA). The animals were screened for the development of diabetes once a week. When glycosuria was found, blood glucose levels were measured (diabetic, >17 mmol/L). To localize the MHC region responsible for diabetes in the NOD mouse (H2g7; MHC haplotype, Kd, Ag7, E-, Db), intra-MHC recombinant NOD mice were established by introducing a recombinational hotspot from B10.A(R209) mice into NOD mice. The B10.A(R209) mouse (H2r209; MHC haplotype, at Kwm7, Ak, Ed, Dd) has a hotspot that causes intra-MHC recombinations between the MHC class I K and class II A regions (14, 15). The MHC wm7 haplotype derived from wild mice, Mus musculus molossinus (MOL), enhances meiotic recombination at a 1.3-kb DNA segment adjacent to the gene for low-molecular-mass polypeptide-2 (Lmp2 hotspot) (16, 17).
NOD mice were mated with B10.A(R209) mice (hereafter R209) to produce
F1(NOD x R209) mice. Heterozygous
F1 mice were mated with NOD mice to produce first
backcross (BC1) [(NOD x R209)F1 x NOD]
mice. Female BC1 F107 and F144 were intra-MHC recombinants
(recombination frequency 2.6% in females). The MHC haplotype of BC1
F107 was g7/g7 at K and g7/r209 at A through D. The MHC haplotype of
BC1 F144 was g7/r209 at K and g7/g7 at A through D. The two intra-MHC
recombinant BC1 females were backcrossed to NOD mice to produce BC2 and
BC3 intra-MHC recombinant mice. The BC3 heterozygous mice were
intercrossed to produce the N4 intra-MHC recombinant NOD mice. The N4
intercross animals were typed for the MHC haplotypes and divided into
five groups (G1-G5 in Table I
).
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Cervical lymph node cells were prepared from NOD and R209 mice and incubated with mAbs reacting with the MHC class I and II molecules: mAb SF1-1.1 (Kd), mAb HD25 (Kwm7) (15), mAb 28-8-6S (Db), mAb 34-5-8S (Dd), mAb 10-2-16 (I-Ak,f,r,s) reacting with both NOD and R209, mAb Y3P (I-Ab,f,p,q,r) reacting with R209, and mAb 14-4-4S (I-E). Nonspecific mouse myeloma Ig (RPC5.4) was used as negative control. FITC-conjugated goat anti-mouse IgG (Fc specific) was used as a second Ab. The reactivity was examined by flow cytometric analysis.
Genotyping analysis
DNA was extracted from tails or livers according to the standard protocols using proteinase K and phenol/chloroform. Southern blot analysis was performed according to the previous method (16). The DNA samples were subjected to genotyping with the microsatellite markers (MapPairs; Research Genetics, Huntsville, AL). PCR reactions were performed according to the methods described elsewhere (18). The marker distances from the centromere were based on the data of the MIT F2 intercrosses.
| Results and Discussion |
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The incidence of diabetes and insulitis in the
G1-G5 group of the N4 and
N7 intercross mice at 10 mo of age is shown in Table I
. Replacement
(homologous recombination) of the NOD class I K region with the R209
class I K region prevented the development of diabetes and
insulitis in the N4 intercross mice (diabetes, 55% in
G1 and 0% in G3;
insulitis, 72% in G1 and 15% in
G3) and in the N7 intercross mice (diabetes, 71%
in G1 and 3% in G3;
insulitis, 61% in G1 and 15% in
G3). Similarly, the replacement of the NOD A, E,
and D region with that of the R209 mouse prevented the development of
diabetes and insulitis in N4 G5 mice (diabetes,
0%; insulitis, 9%) and in N7 G5 (diabetes, 0%;
insulitis, 3%). The heterozygotes in G2 and
G4 of the N4 and N7 generations showed a reduced
incidence of diabetes and insulitis in comparison with the homozygotes
in G1. The incidence of diabetes in the N10
intercross mice at 6 mo of age was 67% (22/33) in
G1, 17% (4/24) in G2, 0%
(0/12) in G3, 5% (1/19) in
G4, and 0% (0/18) in G5.
Thus, replacement of the NOD MHC class I K region with the R209 K
region was associated with marked suppression of diabetes in the N4,
N7, and N10 intra-MHC recombinant NOD mice in a dose-dependent
manner.
The MHC class II molecules on the spleen cells from the N10 G3 intra-MHC recombinant NOD mice at 4 mo of age were measured and compared with those from the N10 G1 mice using the Quantum Fluorescence Kits for molecules of equivalent soluble fluorochromes (MESF) units of FITC (Sigma, St. Louis, MO) and mAb 10-2-16 and 40A reacting with NOD MHC I-Ag7. The level of the MHC class II surface molecules on the spleen cells was not significantly different between the G1 and G3 group in the quantitation assay. This result indicates that the G3 intra-MHC recombinant NOD mice express the MHC class II molecules well, and that the suppression of diabetes in the G3 mice is unrelated to the MHC class II surface expression, but may be caused by novel diabetogenic genes in the region centromeric to the Lmp2 gene.
Telomeric recombinational site adjacent to the Lmp2 gene
RFLP analysis showed that the parental BC1 F107 and F144 mice and
G3 mice in the N4 intra-MHC recombinant mice had
a recombinational site at 2 kb centromeric to Lmp2/Tap1
complex (Fig. 1
). Taken the incidence of
diabetes and insulitis in the N4 intra-MHC recombinant NOD mice into
considerartion (Table I
), the results from the RFLP analysis suggests
that the region centromeric to Lmp2, including the MHC class
I K, is important for the development of diabetes and insulitis as well
as the MHC class II genes.
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To assess the contribution of the R209 MHC-linked segments to the disease protection, tail or liver DNA samples from NOD, R209, and the BC6 intra-MHC recombinant (heterozygous) mice were examined for homozygosity at Idd3, -4, -5, -6, -7, -8, -9, -11, -12, -13, -14, and -15 loci. All the non-MHC Idd segments carried only the NOD types. This suggests that the contribution to changes in the incidence of diabetes and insulitis was caused by the MHC-linked segments.
Centromeric boundaries in the congenic lines of the intra-MHC recombinant NOD mice
Our breeding studies have reached the BC1113 and N12
generations. The G3 intra-MHC recombinant NOD
mice from the intercrosses (N12) of the BC11 mice were examined for the
centromeric boundaries of the r209 segment. Two different
types of the recombinational sites were found at 4.4 and >6.6 cM
centromeric to the MHC K locus. In comparison with the
G1 mice, these G3 mice with
a different length of homozygous r209/r209 segment should
provide information to determine the region containing the second
MHC-linked diabetogenic gene. Two N12 congenic lines, whose centromeric
boundaries are at different distances, were established and screened
for the development of diabetes for 250 days. Of the
G3 lines, G3-A line, whose
centromeric boundary was at >6.6 cM to Lmp2, did not
develop diabetes (incidence: 0/16 females and 0/28 males,
p < 4 x 10-10 and
p < 1 x 10-10,
respectively, vs G1; Fishers exact test), while
G1 mice developed diabetes at the incidence of
87% (40/46) in females and 78% (32/41) in males by the age of 250
days (Fig. 2
). G3-B
line, whose centromeric boundary was at 4.4 cM, was protected against
diabetes by the age of 250 days (incidence: 4/10 females and 0/8 males,
p < 0.005 and p < 1 x
10-4, respectively, vs
G1). Comparison of the disease incidence between
female lines G3-A and G3-B
(p = 0.014) suggests a third MHC-linked
diabetogenic gene outside of the MHC region. This is further supported
by the analysis of the G3 cogenic mice whose
chromosomal segments were homozygous r209/r209 in the region
of 4.4 cM centromeric to Lmp2 and heterozygous
r209/nod in the different segment of the region of >4.4 cM
developed diabetes at 20% incidence (2/10 mice) at the age of 250
days, suggesting a third MHC-linked diabetogenic gene outside of the
MHC region.
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| Acknowledgments |
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| Footnotes |
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2 Address correspondence and reprint requests to Dr. Masakazu Hattori, Section on Immunology and Immunogenetics, Joslin Diabetes Center, One Joslin Place, Boston, MA 02215. E-mail address: ![]()
3 Abbreviation used in this paper: NOD, nonobese diabetic. ![]()
Received for publication January 14, 1999. Accepted for publication June 1, 1999.
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