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Comparison of E14.5 embryonic kidney transcriptomes (Grb2 ureteric-specific knockout vs wild-type)

ABSTRACT: Grb2 is a small SH2-SH3 adaptor molecule that interacts with activated tyrosine kinase receptors (RTKs), providing a crucial link towards downstream activation of pro-proliferative and pro-survival ERK and Akt signaling pathways. Ret and FGFR2, two RTKs that interact with Grb2, play important roles in ureteric branching and the proper establishment of the renal collecting duct system, but it is unclear whether Grb2 is required in this process. In this study, we selectively ablated a conditional floxed allele of the Grb2 gene within the ureteric epithelial lineage in mice and demonstrate that Grb2 signaling is essentially required for proper collecting duct development. Ureteric Grb2 deficiency results in perinatal lethality and severe renal hypodysplasia closely reminiscent of the rudimentary kidney phenotypes observed in Ret-null mutant mice. Grb2 loss attenuates ERK and Akt activation in the ureteric epithelia resulting in pronounced impairment of ureteric branching. Gene expression analysis reveals that Grb2 deficiency results in defective induction of genes implicated in both ureteric branching and reciprocal mesenchymal metanephric induction. Our findings therefore strongly indicate that Grb2 is a physiologically-relevant major RTK signaling relay partner that promotes renal branching morphogenesis and the proper development of the collecting duct system and the urogenital tract. Microarray was used to profile and compare the transcriptomes of developing kidneys of E14.5 Grb2 conditional knockout (ureteric-bud specific) and wild-type embryos

ORGANISM(S): Mus musculus

PROVIDER: GSE163040 | GEO | 2023/12/01

REPOSITORIES: GEO

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