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2014 ; 23
(20
): 5441-51
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Bardet-Biedl syndrome proteins 1 and 3 regulate the ciliary trafficking of
polycystic kidney disease 1 protein
#MMPMID24939912
Su X
; Driscoll K
; Yao G
; Raed A
; Wu M
; Beales PL
; Zhou J
Hum Mol Genet
2014[Oct]; 23
(20
): 5441-51
PMID24939912
show ga
Bardet-Biedl syndrome (BBS) and autosomal dominant polycystic kidney disease
(ADPKD) are two genetically distinct ciliopathies but share common phenotypes
such as renal cysts. Seven BBS proteins form a complex called the BBSome which is
localized at the basal body or ciliary axoneme and regulates the ciliary entry or
flagellar exit of several signaling molecules. Here, we demonstrate that, unlike
the seven-span somatostatin receptor 3 or the leptin receptor that interacts with
all subunits of the BBSome, the ADPKD protein polycystin-1 (PC1) interacts with
BBS1, BBS4, BBS5 and BBS8, four of the seven components of the BBSome. Only
depletion or mutation of BBS1, but not depletion of BBS5 and BBS8, or knockout of
BBS4, impairs ciliary trafficking of PC1 in kidney epithelial cells. Depletion of
these BBS proteins affects neither the ciliary length nor the plasma membrane
targeting of PC1. Expression of a pathogenic BBS3/Arl6 mutant (T31R) that locks
Arl6 in the GDP form leads to stunted cilia and inhibition of PC1 on primary
cilia. We propose that the 11-span membrane protein PC1 is a BBSome cargo and
that the components of the BBSome may possess subunit-specific functions.
Moreover, physical interactions between the BBS and ADPKD proteins may underline
the overlapping renal phenotypes in these two diseases.