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Expression profiles of wildtype and SHOX transgenic embryonic mouse limbs

ABSTRACT: Deficiency of the human short stature homeobox-containing gene (SHOX) has been identified in several disorders characterized by reduced height and skeletal anomalies such as Turner, Leri-Weill and Langer syndrome as well as idiopathic short stature. Although highly conserved in vertebrates, rodents lack a SHOX orthologue. Here, we compared gene expression profiles of wildtype and SHOX transgenic mouse limbs using microarray experiments to identify SHOX target genes in the developing limb.

ORGANISM(S): Mus musculus

PROVIDER: GSE47902 | GEO | 2014/08/13

SECONDARY ACCESSION(S): PRJNA208290

REPOSITORIES: GEO

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Expression profiles of wildtype and SHOX transgenic embryonic mouse limbs

Project description:Deficiency of the human short stature homeobox-containing gene (SHOX) has been identified in several disorders characterized by reduced height and skeletal anomalies such as Turner, Leri-Weill and Langer syndrome as well as idiopathic short stature. Although highly conserved in vertebrates, rodents lack a SHOX orthologue. Here, we compared gene expression profiles of wildtype and SHOX transgenic mouse limbs using microarray experiments to identify SHOX target genes in the developing limb. Limbs of E12.5 mouse embryos were dissected, fore- and hindlimbs were pooled and genotyped for RNA extraction. RNA from 2 to 4 littermates was pooled per genotype (Wildtype and SHOX transgene) and compared. In total, 2 microarray hybridization experiments were performed using RNA from 2 biological replicate samples for each genotype.

2014-08-13 | E-GEOD-47902 | biostudies-arrayexpress

Profiling of upstream enhancers of SHOX in idiopathic short stature and functional characterization of the cis-regulatory landscape of SHOX

Project description:SHOX mutations and deletions of the downstream regulatory region have been reported in cases with idiopathic short stature (ISS) and Leri-Weill dyschondrosteosis (LWD). Recently, a deletion and duplication of upstream enhancers have been described in ISS. Here, we aimed to evaluate the contribution of upstream copy number variations (CNVs) to the pathogenesis of ISS, to validate the enhancer role of the upstream enhancers in human cells, and to characterize the chromatin architecture of the cis-regulatory landscape of SHOX. CNV analysis of three upstream conserved non-coding elements (CNEs), CNE-5, CNE-3 and CNE-2, in 501 ISS referrals with no established molecular diagnosis revealed two deletions and one duplication. Enhancer activity of the upstream CNEs was corroborated by luciferase assays in human osteosarcoma U2OS cells. In addition, all three CNEs overlap with reported H3K27ac ChIP-seq marks in human embryonic limb buds. To characterize the chromatin interaction profile of the SHOX region, chromosome conformation capture (4C-seq) was performed in chicken embryo limb buds and in U2OS cells, revealing interactions of the upstream CNEs with the SHOX promoter. Moreover, the 4C-seq interaction maps and H3K27ac marks indicated that the cis-regulatory landscape of SHOX encompasses 1 Mb, suggesting additional cis-regulatory elements controlling SHOX.In conclusion, we showed that upstream CNVs of SHOX are rare in ISS and have incomplete penetrance. Chromatin interaction maps, luciferase assays and H3K27ac marks further support an enhancer function for the upstream CNEs. Finally, we demonstrated that the cis-regulatory landscape of SHOX is larger than previously anticipated potentially harboring novel cis-regulatory elements, which may be involved in the pathogenesis of molecularly unsolved ISS cases..

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