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Updated: Jun 28, 2026

A Protocol for Multiple Gene Knockout in Mouse Small Intestinal Organoids Using a CRISPR-concatemer

A Protocol for Multiple Gene Knockout in Mouse Small Intestinal Organoids Using a CRISPR-concatemer

Published on: July 12, 2017

NFIX--one gene, two knockouts, multiple effects.

Vladimir Pekarik¹, Juan Carlos Izpisua Belmonte

¹Center of Regenerative Medicine in Barcelona, Doctor Aiguader 88, 08003 Barcelona, Spain.

Journal of Biology

|November 6, 2008

Summary

Knocking out the nuclear factor IX (NFIX) gene in mice can cause developmental issues. Similar NFIX knockouts show different results, prompting investigation into the causes of these variations in mouse models.

Area of Science:

Developmental biology
Genetics
Molecular biology

Background:

The transcription factor nuclear factor IX (NFIX) plays a crucial role in mammalian development.
Previous studies involving NFIX gene knockout in mice have demonstrated significant impacts on corpus callosum formation and skeletal development.
Recent research has presented findings of an NFIX knockout with notably different phenotypic outcomes compared to prior reports.

Purpose of the Study:

To investigate the reasons behind the phenotypic variability observed in different NFIX knockout mouse models.
To explore the potential causes contributing to discrepancies in developmental outcomes following NFIX gene disruption.
To address the broader implications for reproducibility and interpretation of knockout mouse studies.

Main Methods:

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Comparative analysis of phenotypic data from different NFIX knockout mouse studies.
Review of experimental methodologies and genetic backgrounds in reported NFIX knockout models.
Literature review focusing on factors influencing gene knockout phenotypes.

Main Results:

Significant phenotypic differences were observed between previously reported and recently identified NFIX knockout mouse models.
Variations in developmental defects, including corpus callosum formation and skeletal anomalies, were noted.
The study highlights the potential impact of subtle genetic or experimental variations on knockout phenotypes.

Conclusions:

Phenotypic variability in NFIX knockout mice suggests that factors beyond the targeted gene itself can influence developmental outcomes.
Understanding these variations is critical for accurate interpretation of gene function studies using knockout models.
Further research is warranted to elucidate the specific mechanisms driving these divergent phenotypes in NFIX knockout mice.