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CUTTING EDGE |



,§
*
Uniformed Services University of the Health Sciences, Bethesda, MD 20814;
Oak Ridge National Laboratories, Oak Ridge, TN 37831; and
Department of Medicine and
§
Department of Human Genetics, McGill University, Montreal, Canada
A point mutation in the Tlr4 gene, which encodes
Toll-like receptor 4, has recently been proposed to underlie LPS
hyporesponsiveness in C3H/HeJ mice (Lpsd).
The data presented herein demonstrate that F1 progeny from
crosses between mice that carry a
9-cM deletion of chromosome 4
(including deletion of LpsTlr4) and C3H/HeJ
mice (i.e., Lps0 x
Lpsd F1 mice) exhibit a pattern
of LPS sensitivity, measured by TNF activity, that is indistinguishable
from that exhibited by Lpsn x
Lpsd F1 progeny and whose
average response is "intermediate" to parental responses. Thus,
these data provide clear functional support for the hypothesis that the
C3H/HeJ defect exerts a dominant negative effect on LPS sensitivity;
however, expression of a normal Toll-like receptor 4 molecule is
apparently not required.
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