Evaluation of the role of fatty acid-binding protein 7 in controlling schizophrenia-relevant phenotypes using newly established knockout mice

Schizophr Res. 2020 Mar;217:52-59. doi: 10.1016/j.schres.2019.02.002. Epub 2019 Feb 11.


Dampened prepulse inhibition (PPI) is a consistent observation in psychiatric disorders, including schizophrenia and qualifies as a robust endophenotype for genetic evaluation. Using high PPI C57BL/6NCrlCrlj (B6Nj) and low PPI C3H/HeNCrlCrlj (C3HNj) inbred mouse strains, we have previously reported a quantitative trait locus (QTL) for PPI at chromosome 10 and identified Fabp7 as a candidate gene for regulating PPI and schizophrenia pathogenesis using Fabp7-deficient mice (B6.Cg-Fabp7 KO). Here, considering a possibility of carryover of residual genetic materials from embryonic stem (ES) cells used in generating knockout (KO) mice, we set out to re-address the genotype-phenotype correlation in a uniform genetic background. By generating a new Fabp7 KO mouse model in C57BL/6NCrl (B6N) background using the CRISPR-Cas9 nickase system, we evaluated the impact of Fabp7 ablation on schizophrenia-related behavioral phenotypes. To our surprise, we found no significant differences in PPI or any of the schizophrenia-related behavioral scores, as observed in our previous B6.Cg-Fabp7 KO mice. We identified several C3H/He mouse strain-specific alleles within the interval of chromosome 10-QTL, which are shared with 129/Sv mouse strains. These alleles, derived from 129/Sv ES cells, were retained in the B6.Cg-Fabp7 KO, despite multiple backcrossing and are thought to be responsible for the dampened PPI. In summary, our study demonstrates a precise genotype-phenotype relation for Fabp7 loss-of-function in a uniform B6N background, and raises the necessity of further analysis of the effects of genomic variants flanking the Fabp7 interval on phenotypes.

Keywords: Cadherin related 23; Fatty acid-binding protein 7; Mouse behaviors; Prepulse inhibition; Psychiatric disorder.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Fatty Acid-Binding Protein 7
  • Male
  • Mice
  • Mice, Inbred C3H
  • Mice, Inbred C57BL
  • Mice, Knockout
  • Phenotype
  • Schizophrenia* / genetics


  • Fatty Acid-Binding Protein 7