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Related Experiment Video

Updated: Nov 24, 2025

Validation of a Mouse Model to Disrupt LINC Complexes in a Cell-specific Manner

Validation of a Mouse Model to Disrupt LINC Complexes in a Cell-specific Manner

Published on: December 10, 2015

Modeling by disruption and a selected-for partner for the nude locus.

Jian Li^1,2, Yun-Kyoung Lee¹, Wenyu Fu^1,2

¹Department of Cell Biology, State University of New York Downstate Health Sciences University, Brooklyn, NY, USA.

|December 28, 2020

Summary

Researchers identified the Aff4 gene as a nude-like locus by testing the Foxn1 transcription factor in fruit flies. This novel cross-species approach reveals Aff4

Keywords:

developmental mechanisms flash-forward genetics multimolecular positive selection skin transcriptional regulation

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Area of Science:

Genetics
Developmental Biology
Molecular Biology

Background:

Dissecting complex traits in organisms lacking tractable models presents a significant biological challenge.
The nude locus (Foxn1) is crucial for mammalian hair and thymus development, but studying its function is difficult in species without these structures.

Purpose of the Study:

To develop a novel screening method for identifying genes involved in complex mammalian traits using evolutionarily distant organisms.
To uncover new genes that interact with the Foxn1 transcription factor and play roles in development.

Main Methods:

Screening for genes in fruit flies (Drosophila melanogaster) that are affected by the mammalian Foxn1 transcription factor.
Utilizing the disruptive effects of Foxn1 in flies to identify synergistic genes, assuming disruptive potential correlates with biological function.
Validating candidate genes in mammalian models by examining cooperative effects with Foxn1.

Main Results:

The mammalian Foxn1 transcription factor caused morphological disruption in fruit flies.
Reduced function of specific fly genes rescued these disruptions, identifying potential synergistic partners.
Aff4 was identified as the first nude-like locus, with murine AFF4 and FOXN1 cooperatively inducing similar phenotypes and gene expression patterns in mammals.
AFF4 and FOXN1 were found to cooperate at the pre-initiation complex formation stage of transcription.

Conclusions:

The cross-species screening approach is effective for identifying genes involved in complex traits, even in the absence of a tractable model.
Aff4 plays a previously unrecognized role in mammalian development, cooperating with Foxn1 in cutaneous and thymic development.
The study provides new insights into the molecular mechanisms of transcription initiation and developmental gene interactions.