FOXI1

..These putative HFH-3 target genes include the Na/K-ATPase, Na/H and anion exchangers, E-cadherin, and mineralocorticoid receptor genes as well as genes for the transcription factors HNF-1, vHNF-1, and HNF-4...

..the pendrin coding region, such as its promoter region and/or the coding regions of functionally related genes (FOXI1, KCNJ10), should be taken into account...

..nuclear factor-1beta) promote the terminal epithelial differentiation fate, others (Notch, Brn-1, IRX, KLF4, and Foxi1) tend to regulate differentiation of specific nephron segments and individual cell types...

..The experimental approach was validated with the tumor suppressor protein p53 and the forkhead protein FoxI1 using genomic libraries for zebrafish and mouse generated by shotgun cloning of short genomic fragments...

..We demonstrate that misexpression of Fgf8, Dlx3b and Foxi1 during early gastrulation is sufficient to produce ectopic otic vesicles...

..Excess RA leads to ectopic foxi1 expression throughout the entire preplacodal domain. Foxi1 provides competence to adopt an otic fate...

..We have identified and characterized a key transcriptional regulatory element in the SLC26A4 promoter that binds FOXI1, a transcriptional activator of SLC26A4. In nine patients with PS or nonsyndromic EVA, a novel c...

..We previously suggested that Foxi1 and Dlx3b may provide competence to form the ear because loss of both foxi1 and dlx3b results in ablation of all ..

..However, the forkhead factor, Foxi1, is required for both otic and epibranchial placode development...

..Here, we show that zebrafish embryos mutant for fgf3 and fgf8 do not express early EB placode markers, including foxi1 and pax2a...

..Fgf3 and Fgf8 are upstream activators of atoh1 genes during both phases, and foxi1, pax8 and dlx genes regulate atoh1b in the preplacode...

..that expression of four such subunits A1, B1, E2 and a4 all co-localize with the forkhead transcription factor Foxi1 in a subset of epithelial cells at these three locations...

..In the present study, we analyzed a zebrafish mutant, quadro (quo), deficient in foxi1 gene expression and found that foxi1 is essential for development of an MRC subpopulation rich in vacuolar-type H(+..

..g., zebrafish FoxI1. The bound fragments in hundreds of positive clones are sequenced and retested for their binding activities using ..

..We also used this approach to scan for mutations in KCNJ10 and FOXI1, two genes reported to play a role in the pathogenesis of Pendred syndrome and enlarged vestibular aqueduct...

..Like PSCs in other species, we show that the expression of these genes is likely to be driven by an ortholog of foxi1, which is also sufficient to promote the formation of PSC precursors...

..In zebrafish, both are initiated by localized Fgf signaling plus the ubiquitous competence factor Foxi1, and both express pax8 and sox3 in response...

..Despite extensive testing for point mutations and large rearrangements, a small proportion of alleles still remains unidentified in CBAVD patients...

The human FOXI1 gene codes for a transcription factor involved in the physiology of the inner ear, testis, and kidney. Using three interspecies comparisons, it has been suggested that this may be a gene under human-specific selection...

..To investigate the implication of SLC26A4, FOXI and KCNJ10 genes in unilateral hearing impairment associated with ipsilateral inner ear malformation (Enlargement of the vestibular aqueduct and/or Mondini dysplasia)...

..we screened related genomic fragments, including the SLC26A4 coding regions, the SLC26A4 promoter and the FOXI1 transcription factor gene, in 101 Taiwanese families, and analyzed their phenotypic and genotypic results...

..During the further development of sweat gland secretory portions, Foxa1 and Foxi1, not at all expressed in hair follicles, were progressively up-regulated in WT but not in Tabby footpads...

..Furthermore, six1 expression appears to be regulated by pax2b and also by foxi1 (forkhead box I1) as expected for an early inducer of the otic placode...

..Further investigations on the molecular level identified in zebrafish Fgf3, Fgf8, Foxi1, Pax8, Dlx3b and Dlx4b genes as key players during the induction phase...

..This depends on active proton secretion into the epididymal lumen. We have identified Foxi1 as an important regulator of gene expression in narrow and clear cells-the major proton secretory cells of ..

..In this issue, Blomqvist et al. find that mice lacking Foxi1 have no intercalated cells in the kidney...

..We have reported previously the identification of zebrafish foxi1, which is required for otic placode and jaw development...

..We identified foxi one (foo), the zebrafish ortholog of Foxi1 (FREAC6, FKHL10, HFH-3, Fkh10) and a member of the forkhead domain transcriptional regulator family, as the gene mutated ..

..These findings revealed that C/EBP alpha and HNF-3 gamma cooperatively regulate CYP3A4 expression in hepatic cells by a mechanism that probably involves chromatin remodeling...

Mice that lack the winged helix/forkhead gene Foxi1 (also known as Fkh10) are deaf and display shaker/waltzer behavior, an indication of disturbed balance. While Foxi1 is expressed in the entire otic vesicle at E9...

..We show that hearsay disrupts foxi1, a forkhead domain-containing gene, which is expressed in otic precursor cells before placodes become visible; ..

..These findings implicate Fkh10 as an early regulator necessary for development of both cochlea and vestibulum and identify its human homologue FKHL10 as a previously unknown candidate deafness gene at 5q34.

..HGMW-approved symbols FKHL5, FKHL7, FKHL8, FKHL9 and FKHL10). We also report the sequence and the chromosomal position of a novel human forkhead gene, freac-8 (FKHL12)...

..Applying a circular permutation assay, we show that binding of FREAC proteins to their cognate sites results in bending of the DNA at an angle of 80-90 degrees...

While macro- and microscopic kidney development appear to proceed normally in mice that lack Foxi1, electron microscopy reveals an altered ultrastructure of cells lining the distal nephron...

..In zebrafish, fgf3 and fgf8, dlx3b and dlx4b, and foxi1 have been identified as the earliest-acting genes in this process...

..Several Fox genes (Foxi1, Foxg1) are expressed in the developing otocyst of both zebrafish and mammals...

..We created a stable cell line expressing FoxI1-green fluorescent protein (GFP) or FoxI1-V5 fusion proteins under control of the reverse tetracycline-controlled ..

..expression of IC-specific a4, B1, G3, and C2 subunits, after the induction of the forkhead transcription factor Foxi1. From E15.5, Foxi1 mRNA was detected in IC, where it co-distributed with B1 in late nephrogenesis...

..Mice with a targeted disruption of the gene for the forkhead transcription factor Foxi1 display renal tubular acidosis due to an intercalated cell-differentiation defect...

..Surprisingly, ectodermal foxi1 expression, a marker for the epibranchial placode precursors, is present in both endoderm-deficient embryos and ..

..In contrast, the phenotype caused by disrupting foxi1, which is required for pax8 expression, was not enhanced by simultaneously disrupting pax8...

..foxd2, foxd3, foxd4, foxd5 (foxd4l1), foxd6 (foxd4l3), foxe1, foxe2, foxe3, foxf1, foxf2, foxg1 (foxg1b), foxh1, foxi1, foxj1, foxj2, foxj3, foxk1, foxk2, foxl1, foxl2, foxm1, foxn1, foxn2 (htlf), foxn3 (ches1), foxn4, foxn5 (foxr1), ..

..further provide evidence that pax8 expression and pax2a expression are regulated by two independent factors, Foxi1 and Dlx3b, respectively. Combined loss of both factors eliminates all indications of otic specification...

..Its expression becomes restricted to the ectoderm and the endoderm of the branchial pouches at E10.5. Foxi1 expression is first detected in the endolymphatic duct in the otic vesicle at E10.5...

..The HNF-3/fkh motif therefore comprises a large gene family of transcription factors that play a role in tissue-specific gene regulation and development...

..and that the Fgf and Bmp signaling pathways converge on a set of transcription factors, notably Dlx3b, Sox9a, and Foxi1, that mediate induction and differentiation of the otic primordium...

..In addition, recent studies have shown that zebrafish foxi1 is required for otic and jaw development...

..ARNSD genes; (2) To define genotype-phenotype associations in persons with DFNB1 deafness; (3) To study Pendred syndrome as a complex disease, focusing on the role of FOXI1 and its interacting partners in the Pendred syndrome phenotype.

..These studies should define the function of this critical new protein in differentiation of the kidney tubule, in acid base balance and in early embryonic development. ..

..The results should advance our understanding of the transcriptional program of epithelial cell differentiation and elucidate a novel function for p53 in regulating epithelial cell differentiation in the kidney. ..

..We anticipate that new pathogenetic paradigms and therapeutic strategies will emerge from our studies that can hopefully be applied for the treatment of renal dysgenesis. ..

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..Thus, understanding the epigenetic regulation of kidney development may open new avenues to the treatment or prevention of kidney and urinary tract malformations and kidney failure. ..

..g., BdkrB2-/-) interacts with a defined embryonic stressor (gestational salt) to alter the regulation of kidney development may open new avenues to the treatment or prevention of kidney and urinary tract malformations. ..

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..Thus, understanding the epigenetic regulation of kidney development may open new avenues to the treatment or prevention of kidney and urinary tract malformations and kidney failure. ..

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