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The influence of Fen1 loss on trinucleotide-repeat expansion varies between species. In yeast, loss or haploinsufficiency of the Fen1 homolog Rad27 leads to triplet expansion. In mice, haploinsufficiency of Fen1 leads to expansion of a Huntingtin locus CAG repeat. However, no expansion was seen of a (CTG) n ·(CAG) n repeat in a Myotonic dystrophy type 1 (DM1) knock-in model. In contrast,...
Aquaporin-4 (AQP4) is a brain aquaporin implicated in the pathophysiology of numerous clinical conditions including brain edema. Here we show that rat AQP4 has six cDNA isoforms, formed by alternative splicing. These are named AQP4a–f, where AQP4a and AQP4c correspond to the two classical M1 and M23 isoforms, respectively. The various isoforms are differentially expressed in kidney and brain, and...
Aquaporin-4 (AQP4) has been reported to be upregulated post-partum in pregnancy and in early lung development. Several technical challenges exist in measuring AQP4 protein levels, among them sensitivity to detergent solubilization, sample heating and gel composition. Here we have optimized quantification of AQP4 using immuno-blots. Using improved methodology we find no evidence for AQP4 upregulation...
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