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Updated: Jun 17, 2026

Sample Preparation and Analysis of RNASeq-based Gene Expression Data from Zebrafish
Published on: October 27, 2017
Comparative analysis of catfish BAC end sequences with the zebrafish genome
Hong Liu1, Yanliang Jiang, Shaolin Wang
1The Fish Molecular Genetics and Biotechnology Laboratory, Department of Fisheries and Allied Aquacultures and Program of Cell and Molecular Biosciences, Aquatic Genomics Unit, Auburn University, Auburn, AL 36849, USA. lzh0003@auburn.edu
This study generated BAC end sequences to enable comparative genomics in catfish, identifying conserved genomic regions between catfish and zebrafish. These findings facilitate future structural and functional genome analysis in catfish.
Area of Science:
- Genomics
- Comparative Genomics
- Aquaculture
Background:
- Comparative mapping is crucial for transferring genomic data to species lacking whole genome sequences.
- Its application is limited in catfish, a vital US aquaculture species.
- This study aimed to expand BAC end sequences for catfish comparative mapping.
Purpose of the Study:
- Generate BAC end sequences for catfish.
- Demonstrate their utility in comparative genome analysis.
- Identify conserved genomic regions between catfish and zebrafish.
Main Methods:
- Generated 43,000 new BAC end sequences.
- Utilized existing BAC end sequences (20,000).
- Performed linkage mapping and physical mapping analyses.
- Used BLAST to compare catfish and zebrafish genomes.
Main Results:
- Identified conserved syntenic regions between catfish and zebrafish genomes.
- 17.3% of catfish BAC end sequences showed significant BLAST hits to zebrafish.
- 3,221 unique gene hits were identified, forming a basis for comparative mapping.
- Constructed super scaffolds revealing large conserved genomic segments.
Conclusions:
- BAC end sequences and polymorphic markers are valuable for catfish comparative genomics.
- Highly conserved chromosomal regions exist between catfish and zebrafish.
- Significant chromosomal shuffling and rearrangements are present between the two species.
- Established orthologous regions will aid catfish genome analysis.
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