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Laminin ?1 C-terminal Glu to Gln mutation induces early postimplantation lethality.

ABSTRACT: Laminin-integrin interactions regulate various adhesion-dependent cellular processes. ?1C-Glu, the Glu residue in the laminin ?1 chain C-terminal tail, is crucial for the binding of ?1-laminins to several integrin isoforms. Here, we investigated the impact of ?1C Glu to Gln mutation on ?1-laminin binding to all possible integrin partners in vitro, and found that the mutation specifically ablated binding to ?3, ?6, and ?7 integrins. To examine the physiological significance of ?1C-Glu, we generated a knock-in allele, Lamc1 ^EQ , in which the ?1C Glu to Gln mutation was introduced. Although Lamc1 ^EQ/EQ homozygotes developed into blastocysts and deposited laminins in their basement membranes, they died just after implantation because of disordered extraembryonic development. Given the impact of the Lamc1 ^EQ allele on embryonic development, we developed a knock-in mouse strain enabling on-demand introduction of the ?1C Glu to Gln mutation by the Cre-loxP system. The present study has revealed a crucial role of ?1C-Glu-mediated integrin binding in postimplantation development and provides useful animal models for investigating the physiological roles of laminin-integrin interactions in vivo.

SUBMITTER: Kiyozumi D

PROVIDER: S-EPMC6238537 | biostudies-literature | 2018 Oct

REPOSITORIES: biostudies-literature

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Laminin γ1 C-terminal Glu to Gln mutation induces early postimplantation lethality.

Kiyozumi Daiji D Taniguchi Yukimasa Y Nakano Itsuko I Toga Junko J Yagi Emiko E Hasuwa Hidetoshi H Ikawa Masahito M Sekiguchi Kiyotoshi K

Life science alliance 20180910 5

Laminin-integrin interactions regulate various adhesion-dependent cellular processes. γ1C-Glu, the Glu residue in the laminin γ1 chain C-terminal tail, is crucial for the binding of γ1-laminins to several integrin isoforms. Here, we investigated the impact of γ1C Glu to Gln mutation on γ1-laminin binding to all possible integrin partners in vitro, and found that the mutation specifically ablated binding to α3, α6, and α7 integrins. To examine the physiological significance of γ1C-Glu, we generat ...[more]

PMID: 30456378

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Project description:Neurodegenerative diseases are characterized by the selective degeneration of neuronal populations in different brain regions and frequently the formation of distinct protein aggregates that often overlap between diseases. While the causes of many sporadic neurodegenerative diseases are unclear, genes associated with familial or sporadic forms of disease and the underlying cellular pathways involved tend to support common disease mechanisms. Underscoring this concept, mutations in the Vacuolar Protein Sorting 35 Orthologue (VPS35) gene have been identified to cause late-onset, autosomal dominant familial Parkinson's disease, whereas reduced VPS35 protein levels are reported in vulnerable brain regions of subjects with Alzheimer's disease, neurodegenerative tauopathies such as progressive supranuclear palsy and Pick's disease, and amyotrophic lateral sclerosis. Therefore, VPS35 is commonly implicated in many neurodegenerative diseases. VPS35 plays a critical role in the retromer complex that mediates the retrieval and recycling of transmembrane protein cargo from endosomes to the trans-Golgi network or plasma membrane. VPS35 and retromer function are highly conserved in eukaryotic cells, with the homozygous deletion of VPS35 inducing early embryonic lethality in mice that has hindered an understanding of its role in the brain. Here, we develop conditional knockout mice with the selective deletion of VPS35 in neurons to better elucidate its role in neuronal viability and its connection to neurodegenerative diseases. Surprisingly, the pan-neuronal deletion of VPS35 induces a progressive and rapid disease with motor deficits and early post-natal lethality. Underlying this neurological phenotype is the relatively selective and robust degeneration of motor neurons in the spinal cord. Neuronal loss is accompanied and preceded by the formation of p62-positive protein inclusions and robust reactive astrogliosis. Our study reveals a critical yet unappreciated role for VPS35 function in the normal maintenance and survival of motor neurons during post-natal development that has important implications for neurodegenerative diseases, particularly amyotrophic lateral sclerosis.

Dataset Information

Laminin ?1 C-terminal Glu to Gln mutation induces early postimplantation lethality.

Publications

Laminin γ1 C-terminal Glu to Gln mutation induces early postimplantation lethality.

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