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2016 ; 128
(4
): 584-93
Nephropedia Template TP
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English Wikipedia
Characterization of aberrant splicing of von Willebrand factor in von Willebrand
disease: an underrecognized mechanism
#MMPMID27317792
Hawke L
; Bowman ML
; Poon MC
; Scully MF
; Rivard GE
; James PD
Blood
2016[Jul]; 128
(4
): 584-93
PMID27317792
show ga
Approximately 10% of von Willebrand factor (VWF) gene mutations are thought to
alter messenger RNA (mRNA) splicing through disruption of consensus splice sites.
This mechanism is likely underrecognized and affected by mutations outside
consensus splice sites. During VWF synthesis, splicing abnormalities lead to
qualitative defects or quantitative deficiencies in VWF. This study investigated
the pathologic mechanism acting in 3 von Willebrand disease (VWD) families with
putative splicing mutations using patient-derived blood outgrowth endothelial
cells (BOECs) and a heterologous human embryonic kidney (HEK 293(T)) cell model.
The exonic mutation c.3538G>A causes 3 in-frame splicing variants (23del, 26del,
and 23/26del) which cannot bind platelets, blood coagulation factor VIII, or
collagen, causing VWD through dominant-negative intracellular retention of
coexpressed wild-type (WT) VWF, and increased trafficking to lysosomes.
Individuals heterozygous for the c.5842+1G>C mutation produce exon 33 skipping,
exons 33-34 skipping, and WT VWF transcripts. Pathogenic intracellular retention
of VWF lacking exons 33-34 causes their VWD. The branch site mutation
c.6599-20A>T causes type 1 VWD through mRNA degradation of exon 38 skipping
transcripts. Splicing ratios of aberrant transcripts and coexpressed WT were
altered in the BOECs with exposure to shear stress. This study provides evidence
of mutations outside consensus splice sites disrupting splicing and introduces
the concept that VWF splicing is affected by shear stress on endothelial cells.
|*Point Mutation
[MESH]
|*RNA Splice Sites
[MESH]
|*RNA Splicing
[MESH]
|Exons
[MESH]
|Female
[MESH]
|HEK293 Cells
[MESH]
|Humans
[MESH]
|Male
[MESH]
|RNA Stability/genetics
[MESH]
|RNA, Messenger/genetics/metabolism
[MESH]
|von Willebrand Disease, Type 1/*genetics/metabolism
[MESH]
|von Willebrand Disease, Type 3/*genetics/metabolism
[MESH]