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2016 ; 17
(ä): 318
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Whole organism transcriptome analysis of zebrafish models of Bardet-Biedl
Syndrome and Alström Syndrome provides mechanistic insight into shared and
divergent phenotypes
#MMPMID27142762
Hostelley TL
; Lodh S
; Zaghloul NA
BMC Genomics
2016[May]; 17
(ä): 318
PMID27142762
show ga
BACKGROUND: Bardet-Biedl Syndrome (BBS) and Alström Syndrome are two pleiotropic
ciliopathies with significant phenotypic overlap between them across many
tissues. Although BBS and Alström genes are necessary for the proper function of
primary cilia, their role in defects across multiple organ systems is unclear.
METHODS: To provide insight into the pathways underlying BBS and Alström
phenotypes, we carried out whole organism transcriptome analysis by RNA
sequencing in established zebrafish models of the syndromes. RESULTS: We analyzed
all genes that were significantly differentially expressed and found enrichment
of phenotypically significant pathways in both models. These included multiple
pathways shared between the two disease models as well as those unique to each
model. Notably, we identified significant downregulation of genes in pathways
relevant to visual system deficits and obesity in both disorders, consistent with
those shared phenotypes. In contrast, neuronal pathways were significantly
downregulated only in the BBS model but not in the Alström model. Our
observations also suggested an important role for G-protein couple receptor and
calcium signaling defects in both models. DISCUSSION: Pathway network analyses of
both models indicate that visual system defects may be driven by genetic
mechanisms independent of other phenotypes whereas the majority of other
phenotypes are a result of genetic players that contribute to multiple pathways
simultaneously. Additionally, examination of genes differentially expressed in
opposing directions between the two models suggest a deficit in pancreatic
function in the Alström model, that is not present in the BBS model. CONCLUSIONS:
These findings provide important novel insight into shared and divergent
phenotypes between two similar but distinct genetic syndromes.