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2016 ; 30
(6
): 639-44
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Karyomegalic interstitial nephritis and DNA damage-induced polyploidy in Fan1
nuclease-defective knock-in mice
#MMPMID26980188
Lachaud C
; Slean M
; Marchesi F
; Lock C
; Odell E
; Castor D
; Toth R
; Rouse J
Genes Dev
2016[Mar]; 30
(6
): 639-44
PMID26980188
show ga
The Fan1 endonuclease is required for repair of DNA interstrand cross-links
(ICLs). Mutations in human Fan1 cause karyomegalic interstitial nephritis (KIN),
but it is unclear whether defective ICL repair is responsible or whether Fan1
nuclease activity is relevant. We show that Fan1 nuclease-defective (Fan1(nd/nd))
mice develop a mild form of KIN. The karyomegalic nuclei from Fan1(nd/nd) kidneys
are polyploid, and fibroblasts from Fan1(nd/nd) mice become polyploid upon ICL
induction, suggesting that defective ICL repair causes karyomegaly. Thus, Fan1
nuclease activity promotes ICL repair in a manner that controls ploidy, a role
that we show is not shared by the Fanconi anemia pathway or the Slx4-Slx1
nuclease also involved in ICL repair.