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| Status |
Public on Feb 22, 2023 |
| Title |
Combinatorial effects on gene expression at the Lbx1/Fgf8 locus resolve Split-Hand/Foot Malformation type 3 [4C-seq] |
| Organism |
Homo sapiens |
| Experiment type |
Other
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| Summary |
Split-Hand/Foot Malformation type 3 (SHFM3) is a congenital limb malformation associated with tandem duplications at the LBX1/FGF8 locus. Yet, the disease patho-mechanism remains unsolved. Here we investigated the functional consequences of SHFM3-associated rearrangements on chromatin conformation and gene expression in vivo in transgenic mice. We show that the Lbx1/Fgf8 locus consists of two separate, but interacting, regulatory domains. Re-engineering of a SHFM3-associated duplication and a newly reported inversion in mice resulted in restructuring of the chromatin architecture. This led to an ectopic activation of the Lbx1 and Btrc genes in the apical ectodermal ridge (AER) in an Fgf8-like pattern. Artificial repositioning of the AER-specific enhancers of Fgf8 was sufficient to induce misexpression of Lbx1 and Btrc. We provide evidence that the SHFM3 phenotype is the result of a combinatorial effect on gene misexpression and dosage in the developing limb. Our results reveal new insights into the molecular mechanism underlying SHFM3 and provide novel conceptual framework for how genomic rearrangements can cause gene misexpression and disease.
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| Overall design |
We used 4C-seq to investigate interactions specific to Lbx1, Btrc and Fgf8 in a patient carrying a SHFM3 duplication versus a healthy control
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| Contributor(s) |
Cova G |
| Citation(s) |
36928426 |
| |
| Submission date |
Jan 22, 2023 |
| Last update date |
May 24, 2023 |
| Contact name |
Giulia Cova |
| E-mail(s) |
Giulia.cova@nyulangone.org
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| Organization name |
Max Planck Institute
|
| Street address |
63-73 Ihnestrasse
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| City |
Berlin |
| ZIP/Postal code |
14195 |
| Country |
Germany |
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| Platforms (1) |
| GPL24676 |
Illumina NovaSeq 6000 (Homo sapiens) |
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| Samples (12)
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| This SubSeries is part of SuperSeries: |
| GSE197404 |
Combinatorial effects on gene expression at the Lbx1/Fgf8 locus resolve Split-Hand/Foot Malformation type 3 |
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| Relations |
| BioProject |
PRJNA926332 |
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