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Updated: May 29, 2026
Zebrafish Whole Mount High-Resolution Double Fluorescent In Situ Hybridization
Published on: March 25, 2009
Embryonic expression of zebrafish MiT family genes tfe3b, tfeb, and tfec
James A Lister1, Brandon M Lane, Anhthu Nguyen
1Department of Human and Molecular Genetics and Massey Cancer Center, Virginia Commonwealth University School of Medicine, PO Box 980033, Richmond, Virginia 23298, USA. jalister@vcu.edu
Abstract:
The MiT family comprises four genes in mammals: Mitf, Tfe3, Tfeb, and Tfec, which encode transcription factors of the basic-helix-loop-helix/leucine zipper class. Mitf is well-known for its essential role in the development of melanocytes, however the functions of the other members of this family, and of interactions between them, are less well understood. We have now characterized the complete set of MiT genes from zebrafish, which totals six instead of four. The zebrafish genome contain two mitf (mitfa and mitfb), two tfe3 (tfe3a and tfe3b), and single tfeb and tfec genes; this distribution is shared with other teleosts. We present here the sequence and embryonic expression patterns for the zebrafish tfe3b, tfeb, and tfec genes, and identify a new isoform of tfe3a. These findings will assist in elucidating the roles of the MiT gene family over the course of vertebrate evolution.
Insights
Zebrafish possess six MiT family genes, expanding beyond the four found in mammals. This study details the zebrafish MiT gene set, aiding research into vertebrate evolution and gene function.
Area of Science:
- Developmental Biology
- Genetics
- Evolutionary Biology
Background:
- The MiT gene family, including Mitf, Tfe3, Tfeb, and Tfec, encodes basic-helix-loop-helix/leucine zipper transcription factors.
- While Mitf's role in melanocyte development is established, the functions and interactions of other MiT family members remain less understood.
Purpose of the Study:
- To characterize the complete set of MiT genes in zebrafish.
- To investigate the embryonic expression patterns of specific zebrafish MiT genes.
Main Methods:
- Bioinformatic analysis to identify MiT family genes in the zebrafish genome.
- Sequencing of zebrafish tfe3b, tfeb, and tfec genes.
- Identification of a novel tfe3a isoform.
- Analysis of embryonic expression patterns.
Main Results:
- Zebrafish possess six MiT genes: two mitf (mitfa, mitfb), two tfe3 (tfe3a, tfe3b), and single tfeb and tfec.
- This gene distribution is conserved in other teleosts.
- The study presents sequence data and embryonic expression patterns for zebrafish tfe3b, tfeb, tfec, and a new tfe3a isoform.
Conclusions:
- The expanded MiT gene repertoire in zebrafish provides a valuable model for studying MiT family functions.
- These findings contribute to understanding the evolution of MiT genes and their roles in vertebrate development.
