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In-vitro Mutagenesis

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A Rapid In Vivo Bioassay for Developmentally Active Enhancers

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Genetic knockout suggests Isl1 enhancer redundancy in mouse hindlimb development.

Seth Olson¹, Hiroko Kawakami², Alexandra Maria Nichitean¹

¹Department of Genetics, Cell Biology and Development, University of Minnesota, Minneapolis, MN, United States of America.

Developmental Biology

|September 19, 2025

Summary

The Isl1 hindlimb progenitor enhancer (HLPE) is crucial for regulating Isl1 gene expression in developing limbs and branchial arches. Its deletion causes shorter long bones in mice, indicating its role in chondrogenesis.

Keywords:

Cis-regulatory elements Enhancer Hindlimb progenitor cells Isl1

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A Reverse Genetic Approach to Test Functional Redundancy During Embryogenesis

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Published on: August 11, 2010

Area of Science:

Developmental Biology
Molecular Genetics
Skeletal Biology

Background:

Isl1 is a transcription factor essential for hindlimb development, expressed in progenitor cells.
A cis-regulatory element, the Isl1 hindlimb progenitor enhancer (HLPE), drives reporter expression in relevant embryonic tissues.
SALL4 transcription factor enrichment at HLPE suggests a regulatory role in Isl1 expression.

Purpose of the Study:

To investigate the regulatory function of the Isl1 HLPE in mouse embryonic development.
To determine if the Isl1 HLPE is essential for Isl1 expression and hindlimb development.
To explore the potential interaction between SALL4 and Isl1 HLPE in regulating Isl1.

Main Methods:

Generation of Isl1 HLPE knockout (HLPE^-/-) mice using CRISPR/Cas9.
Phenotypic analysis of HLPE^-/- mice, including skeletal morphology and gene expression.
In situ hybridization and quantitative gene expression analysis of Isl1 and related genes.
Analysis of compound mutants with conditional Sall4 deletion.

Main Results:

Isl1 HLPE^-/- mice exhibited shorter long bones, indicating impaired chondrogenesis.
Quantitative analysis revealed reduced, but not abolished, Isl1 expression in HLPE^-/- embryos.
Reduced ISL1 protein levels were observed in the branchial arch ectoderm of HLPE^-/- embryos.
No synergistic effect was observed between HLPE deletion and Sall4 mutation on skeletal development.

Conclusions:

The Isl1 HLPE functions as an enhancer for Isl1 expression in hindlimb progenitor and branchial arch ectoderm cells.
Deletion of the Isl1 HLPE impacts chondrogenesis, leading to shorter long bones.
Isl1 expression is likely co-regulated by multiple redundant enhancers.