title: Abelson interactor 1 (ABI1) and its interaction with Wiskott-Aldrich syndrome protein (wasp) are critical for proper eye formation in Xenopus embryos.
abstract: Abl interactor 1 (Abi1) is a scaffold protein that plays a central role in the regulation of actin cytoskeleton dynamics as a constituent of several key protein complexes, and homozygous loss of this protein leads to embryonic lethality in mice. Because this scaffold protein has been shown in cultured cells to be a critical component of pathways controlling cell migration and actin regulation at cell-cell contacts, we were interested to investigate the in vivo role of Abi1 in morphogenesis during the development of Xenopus embryos. Using morpholino-mediated translation inhibition, we demonstrate that knockdown of Abi1 in the whole embryo, or specifically in eye field progenitor cells, leads to disruption of eye morphogenesis. Moreover, signaling through the Src homology 3 domain of Abi1 is critical for proper movement of retinal progenitor cells into the eye field and their appropriate differentiation, and this process is dependent upon an interaction with the nucleation-promoting factor Wasp (Wiskott-Aldrich syndrome protein). Collectively, our data demonstrate that the Abi1 scaffold protein is an essential regulator of cell movement processes required for normal eye development in Xenopus embryos and specifically requires an Src homology 3 domain-dependent interaction with Wasp to regulate this complex morphogenetic process.
authors.affiliation: Laboratory of Cell and Developmental Signaling, NCI-Frederick, National Institutes of Health, Frederick, Maryland 21702.
authors.forename: Arvinder
authors.initials: A
authors.lastname: Singh
authors.affiliation: Laboratory of Cell and Developmental Signaling, NCI-Frederick, National Institutes of Health, Frederick, Maryland 21702.
authors.forename: Emily F
authors.initials: EF
authors.lastname: Winterbottom
authors.affiliation: Laboratory of Cell and Developmental Signaling, NCI-Frederick, National Institutes of Health, Frederick, Maryland 21702.
authors.forename: Yon Ju
authors.initials: YJ
authors.lastname: Ji
authors.affiliation: Laboratory of Cell and Developmental Signaling, NCI-Frederick, National Institutes of Health, Frederick, Maryland 21702.
authors.forename: Yoo-Seok
authors.initials: YS
authors.lastname: Hwang
authors.affiliation: Laboratory of Cell and Developmental Signaling, NCI-Frederick, National Institutes of Health, Frederick, Maryland 21702. Electronic address: daar@ncifcrf.gov.
authors.forename: Ira O
authors.initials: IO
authors.lastname: Daar
mesh_terms: D008841:Actin Cytoskeleton / Q000378:metabolism; D048868:Adaptor Proteins, Signal Transducing / Q000737:chemistry / Q000235:genetics / Q000378:metabolism* / Q000502:physiology; D000818:Animals; D019070:Cell Lineage; D002465:Cell Movement; D005123:Eye / Q000196:embryology*; D018507:Gene Expression Regulation, Developmental; D016366:Open Reading Frames; D010766:Phosphorylation; D011485:Protein Binding; D017434:Protein Structure, Tertiary; D012160:Retina / Q000196:embryology; D015398:Signal Transduction; D013234:Stem Cells / Q000166:cytology; D051316:Wiskott-Aldrich Syndrome Protein / Q000378:metabolism*; D014981:Xenopus / Q000196:embryology* / Q000235:genetics; D029867:Xenopus Proteins / Q000737:chemistry / Q000502:physiology*; D018909:src Homology Domains
chemical_list: C582671:Abi1 protein, Xenopus; D048868:Adaptor Proteins, Signal Transducing; D051316:Wiskott-Aldrich Syndrome Protein; D029867:Xenopus Proteins
keywords: Cell Migration; Development; Eye; Signal Transduction; Xenopus
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