Transcriptional Profiling of Common Carp: A Microarray-Based Framework for Aquaculture Research

Area of Science:

• Aquaculture
• Genomics
• Molecular Biology

Background:

• Common carp (Cyprinus carpio L.) is vital in aquaculture, but its complex genome hinders gene expression analysis.
• Alternative splicing and paleotetraploid genome present challenges for transcriptome interpretation.

Purpose of the Study:

• To develop a species-specific oligonucleotide microarray for reproducible gene-level expression profiling in common carp.
• To establish a baseline functional gene expression profile of the head kidney in common carp.

Main Methods:

• Designed a custom oligonucleotide microarray using a gene-level strategy with 60-mer probes on an Agilent platform.
• Utilized 614 Cyprinus carpio L. - Danio rerio orthologs and enrichment tools to define baseline head kidney functions.
• Employed a standardized two-color pipeline with embedded technical controls for stable measurements.

Main Results:

• Identified key functional modules including oxygen transport, heme metabolism, antioxidant defense, protease regulation, and immune responses.
• Observed a bias towards c-Myc targets, suggesting ongoing hematopoiesis.
• Established a reference baseline for detecting infection- or exposure-induced gene expression changes.

Conclusions:

• The developed microarray provides a cost-effective and rapid method for gene expression profiling in common carp.
• This platform facilitates host-pathogen studies, contaminant assessment, and standardized health monitoring in aquaculture.
• It complements RNA-seq for large cohorts and longitudinal studies, supporting research and health decision-making.