Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 243.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 243.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 243.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Warning: imagejpeg(C:\Inetpub\vhosts\kidney.de\httpdocs\phplern\27793507
.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 DNA+Repair+(Amst)
2016 ; 48
(ä): 17-29
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Proliferating cell nuclear antigen prevents trinucleotide repeat expansions by
promoting repeat deletion and hairpin removal
#MMPMID27793507
Beaver JM
; Lai Y
; Rolle SJ
; Liu Y
DNA Repair (Amst)
2016[Dec]; 48
(ä): 17-29
PMID27793507
show ga
DNA base lesions and base excision repair (BER) within trinucleotide repeat (TNR)
tracts modulate repeat instability through the coordination among the key BER
enzymes DNA polymerase ?, flap endonuclease 1 (FEN1) and DNA ligase I (LIG I).
However, it remains unknown whether BER cofactors can also alter TNR stability.
In this study, we discovered that proliferating cell nuclear antigen (PCNA), a
cofactor of BER, promoted CAG repeat deletion and removal of a CAG repeat hairpin
during BER in a duplex CAG repeat tract and CAG hairpin loop, respectively. We
showed that PCNA stimulated LIG I activity on a nick across a small template loop
during BER in a duplex (CAG)(20) repeat tract promoting small repeat deletions.
Surprisingly, we found that during BER in a hairpin loop, PCNA promoted
reannealing of the upstream flap of a double-flap intermediate, thereby
facilitating the formation of a downstream flap and stimulating FEN1 cleavage
activity and hairpin removal. Our results indicate that PCNA plays a critical
role in preventing CAG repeat expansions by modulating the structures of dynamic
DNA via cooperation with BER enzymes. We provide the first evidence that PCNA
prevents CAG repeat expansions during BER by promoting CAG repeat deletion and
removal of a TNR hairpin.
|*Base Sequence
[MESH]
|*Sequence Deletion
[MESH]
|*Trinucleotide Repeat Expansion
[MESH]
|DNA Damage
[MESH]
|DNA Ligase ATP/*genetics/metabolism
[MESH]
|DNA Polymerase beta/*genetics/metabolism
[MESH]
|DNA Repair
[MESH]
|DNA-(Apurinic or Apyrimidinic Site) Lyase/genetics/metabolism
[MESH]