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Lmx1b and FoxC Combinatorially Regulate Podocin Expression in Podocytes

Identifieur interne : 002937 ( Main/Exploration ); précédent : 002936; suivant : 002938

Lmx1b and FoxC Combinatorially Regulate Podocin Expression in Podocytes

Auteurs : Bing He ; Lwaki Ebarasi [Suède] ; Zhe Zhao [Royaume-Uni] ; Jing Guo ; Juha R. M. Ojala ; Kjell Hultenby [Suède] ; Sarah De Val [Royaume-Uni] ; Christer Betsholtz [Suède] ; Karl Tryggvason [Singapour]

Source :

RBID : PMC:4243338

Abstract

Podocin is a key protein of the kidney podocyte slit diaphragm protein complex, an important part of the glomerular filtration barrier. Mutations in the human podocin gene NPHS2 cause familial or sporadic forms of renal disease owing to the disruption of filtration barrier integrity. The exclusive expression of NPHS2 in podocytes reflects its unique function and raises interesting questions about its transcriptional regulation. Here, we further define a 2.5-kb zebrafish nphs2 promoter fragment previously described and identify a 49-bp podocyte-specific transcriptional enhancer using Tol2-mediated G0 transgenesis in zebrafish. Within this enhancer, we identified a cis-acting element composed of two adjacent DNA-binding sites (FLAT-E and forkhead) bound by transcription factors Lmx1b and FoxC. In zebrafish, double knockdown of Lmx1b and FoxC orthologs using morpholino doses that caused no or minimal phenotypic changes upon individual knockdown completely disrupted podocyte development in 40% of injected embryos. Co-overexpression of the two genes potently induced endogenous nphs2 expression in zebrafish podocytes. We found that the NPHS2 promoter also contains a cis-acting Lmx1b-FoxC motif that binds LMX1B and FoxC2. Furthermore, a genome-wide search identified several genes that carry the Lmx1b-FoxC motif in their promoter regions. Among these candidates, motif-driven podocyte enhancer activity of CCNC and MEIS2 was functionally analyzed in vivo. Our results show that podocyte expression of some genes is combinatorially regulated by two transcription factors interacting synergistically with a common enhancer. This finding provides insights into transcriptional mechanisms required for normal and pathologic podocyte functions.


Url:
DOI: 10.1681/ASN.2012080823
PubMed: 24854274
PubMed Central: 4243338


Affiliations:


Links toward previous steps (curation, corpus...)


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<p>Podocin is a key protein of the kidney podocyte slit diaphragm protein complex, an important part of the glomerular filtration barrier. Mutations in the human podocin gene
<italic>NPHS2</italic>
cause familial or sporadic forms of renal disease owing to the disruption of filtration barrier integrity. The exclusive expression of
<italic>NPHS2</italic>
in podocytes reflects its unique function and raises interesting questions about its transcriptional regulation. Here, we further define a 2.5-kb zebrafish
<italic>nphs2</italic>
promoter fragment previously described and identify a 49-bp podocyte-specific transcriptional enhancer using Tol2-mediated G
<sub>0</sub>
transgenesis in zebrafish. Within this enhancer, we identified a cis-acting element composed of two adjacent DNA-binding sites (FLAT-E and forkhead) bound by transcription factors Lmx1b and FoxC. In zebrafish, double knockdown of Lmx1b and FoxC orthologs using morpholino doses that caused no or minimal phenotypic changes upon individual knockdown completely disrupted podocyte development in 40% of injected embryos. Co-overexpression of the two genes potently induced endogenous
<italic>nphs2</italic>
expression in zebrafish podocytes. We found that the
<italic>NPHS2</italic>
promoter also contains a cis-acting Lmx1b-FoxC motif that binds LMX1B and FoxC2. Furthermore, a genome-wide search identified several genes that carry the Lmx1b-FoxC motif in their promoter regions. Among these candidates, motif-driven podocyte enhancer activity of
<italic>CCNC</italic>
and
<italic>MEIS2</italic>
was functionally analyzed
<italic>in vivo</italic>
. Our results show that podocyte expression of some genes is combinatorially regulated by two transcription factors interacting synergistically with a common enhancer. This finding provides insights into transcriptional mechanisms required for normal and pathologic podocyte functions.</p>
</div>
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