Tbx1

Identification of a 22q11.2 gene as a risk factor for autism spectrum disorder in a mouse model

Takeshi Hiramoto, Gina Kang, Go Suzuki, Yasushi Satoh, Raju Kucherlapati, Yasuhiro Watanabe, Noboru Hiroi

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

Although twin studies indicate clear genetic bases of autism spectrum disorder (ASD), the precise mechanisms through which genetic variations causally result in ASD are poorly understood. Individuals with 3 Mb and nested 1.5 Mb hemizygosity of the chromosome 22q11.2 represent genetically identifiable cases of ASD. However, because more than 30 genes are deleted even in the minimal deletion cases of 22q11.2 deficiency, the individual 22q11.2 gene(s) responsible for ASD remain elusive. Here, we examined the impact of constitutive heterozygosity of Tbx1, a 22q11.2 gene, on the behavioral phenotypes of ASD and characterized the regional and cellular expression of its mRNA and protein in mice. Congenic Tbx1 heterozygous (HT) mice were impaired in social interaction, ultrasonic vocalization, memory-based behavioral alternation, working memory and thigmotaxis, compared with wild-type (WT) mice. These phenotypes were not due to nonspecific alterations in olfactory function, exploratory behavior, motor movement or anxiety-related behavior. Tbx1 mRNA and protein were ubiquitously expressed throughout the brains of C57BL/6J mice, but protein expression was enriched in regions that postnatally retain the capacity of neurogenesis, and in fact, postnatally proliferating cells expressed Tbx1. In postnatally derived hippocampal culture cells of C57BL/6J mice, Tbx1 levels were higher during proliferation than during differentiation, and expressed in neural progenitor cells, immature and matured neurons and glial cells. Taken together, our data suggest that Tbx1 is a gene responsible for the phenotypes of 22q11.2 hemizygosity-associated ASD possibly through its role in diverse cell types, including postnatally and prenatally generated neurons.

Original languageEnglish (US)
Article numberddr404
Pages (from-to)4775-4785
Number of pages11
JournalHuman Molecular Genetics
Volume20
Issue number24
DOIs
StatePublished - Dec 2011

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Genes
Phenotype
Inbred C57BL Mouse
Neurons
Messenger RNA
Twin Studies
Proteins
Exploratory Behavior
Neurogenesis
Interpersonal Relations
Short-Term Memory
Ultrasonics
Neuroglia
Autism Spectrum Disorder
Stem Cells
Anxiety
Cell Culture Techniques
Chromosomes
Brain

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)
  • Molecular Biology

Cite this

Tbx1 : Identification of a 22q11.2 gene as a risk factor for autism spectrum disorder in a mouse model. / Hiramoto, Takeshi; Kang, Gina; Suzuki, Go; Satoh, Yasushi; Kucherlapati, Raju; Watanabe, Yasuhiro; Hiroi, Noboru.

In: Human Molecular Genetics, Vol. 20, No. 24, ddr404, 12.2011, p. 4775-4785.

Research output: Contribution to journalArticle

Hiramoto, Takeshi ; Kang, Gina ; Suzuki, Go ; Satoh, Yasushi ; Kucherlapati, Raju ; Watanabe, Yasuhiro ; Hiroi, Noboru. / Tbx1 : Identification of a 22q11.2 gene as a risk factor for autism spectrum disorder in a mouse model. In: Human Molecular Genetics. 2011 ; Vol. 20, No. 24. pp. 4775-4785.
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