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Induced Pluripotent Stem Cells Reveal Common Neurodevelopmental Genome Deprograming in Schizophrenia

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Human Neural Stem Cells

Abstract

Schizophrenia is a neurodevelopmental disorder characterized by complex aberrations in the structure, wiring, and chemistry of multiple neuronal systems. The abnormal developmental trajectory of the brain is established during gestation, long before clinical manifestation of the disease. Over 200 genes and even greater numbers of single nucleotide polymorphisms and copy number variations have been linked with schizophrenia. How does altered function of such a variety of genes lead to schizophrenia? We propose that the protein products of these altered genes converge on a common neurodevelopmental pathway responsible for the development of brain neural circuit and neurotransmitter systems. The results of a multichanneled investigation using induced pluripotent stem cell (iPSCs)- and embryonic stem cell (ESCs)-derived neuronal committed cells (NCCs) indicate an early (preneuronal) developmental-genomic etiology of schizophrenia and that the dysregulated developmental gene networks are common to genetically unrelated cases of schizophrenia. The results support a “watershed” mechanism in which mutations within diverse signaling pathways affect the common pan-ontogenic mechanism, integrative nuclear (n)FGFR1 signaling (INFS). Dysregulation of INFS in schizophrenia NCCs deconstructs coordinated gene networks and leads to formation of new networks by the dysregulated genes. This genome deprograming affects critical gene programs and pathways for neural development and functions. Studies show that the genomic deprograming reflect an altered nFGFR1—genome interactions and deregulation of miRNA genes by nFGFR1. In addition, changes in chromatin topology imposed by nFGFR1 may play a role in coordinate gene dysregulation in schizophrenia.

We dedicate this chapter to Patrick W. Lee whose courage and comradery inspired our work.

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Abbreviations

3C:

Chromatin conformation capture

CBP:

CREB-binding protein

ChIPseq:

Chromatin immunoprecipitation sequencing

CNVs:

Copy number variations

ESCs:

Embryonic stem cells

FGFR1(SP-/NLS):

Constitutively nuclear active variant of FGFR1

FGFR1(SP-/NLS)(TK-):

Dominant negative nuclear active variant of FGFR1

GO:

Gene ontology

INFS:

Integrative nuclear FGFR1 signaling

IPA:

Ingenuity pathway analysis

iPSCs:

Induced pluripotent stem cells

NCCs:

Neuronal committed cells (integrative nuclear (n)FGFR1 signaling—INFS)

nFGFR1:

Nuclear fibroblast growth factor receptor-1

RNAseq:

Global RNA sequencing

SNPs:

Single nucleotide polymorphisms

TAD:

Chromatin topologically associated domains

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Correspondence to Michal K. Stachowiak .

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Narla, S.T., Decker, B., Sarder, P., Stachowiak, E.K., Stachowiak, M.K. (2018). Induced Pluripotent Stem Cells Reveal Common Neurodevelopmental Genome Deprograming in Schizophrenia. In: Buzanska, L. (eds) Human Neural Stem Cells. Results and Problems in Cell Differentiation, vol 66. Springer, Cham. https://doi.org/10.1007/978-3-319-93485-3_6

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