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2016 ; 27
(5-6
): 191-9
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High-resolution genetic localization of a modifying locus affecting disease
severity in the juvenile cystic kidneys (jck) mouse model of polycystic kidney
disease
#MMPMID27114383
Beier DR
Mamm Genome
2016[Jun]; 27
(5-6
): 191-9
PMID27114383
show ga
We have previously demonstrated that a locus on proximal Chr 4 modifies disease
severity in the juvenile cystic kidney (jck) mouse, a model of polycystic kidney
disease (PKD) that carries a mutation of the Nek8 serine-threonine kinase. In
this study, we used QTL analysis of independently constructed B6.D2 congenic
lines to confirm this and showed that this locus has a highly significant effect.
We constructed sub-congenic lines to more specifically localize the modifier and
have determined it resides in a 3.2 Mb interval containing 28 genes. These
include Invs and Anks6, which are both excellent candidates for the modifier as
mutations in these genes result in PKD and both genes are known to genetically
and physically interact with Nek8. However, examination of strain-specific DNA
sequence and kidney expression did not reveal clear differences that might
implicate either gene as a modifier of PKD severity. The fact that our
high-resolution analysis did not yield an unambiguous result highlights the
challenge of establishing the causality of strain-specific variants as genetic
modifiers, and suggests that alternative strategies be considered.