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Genetic heterogeneity in isogenic homozygous clonal zebrafish
D G Buth1, M S Gordon, I Plaut
1Department of Biology, University of California, Los Angeles 90095-1606, USA.
Summary
Genetic homogeneity in zebrafish (Danio rerio) is not guaranteed in isogenic homozygous diploid (IHD) clones. A new malate dehydrogenase (sMdh-A) allele has emerged, highlighting the need for genetic uniformity checks in research subjects.
Area of Science:
- Genetics
- Developmental Biology
- Aquatic Animal Models
Background:
- Isogenic homozygous diploid (IHD) zebrafish strains are valuable research models due to their genetic uniformity.
- Maintaining genetic homogeneity in cloned lines over time can be challenging, especially with sexual reproduction.
- The C32 IHD zebrafish strain was previously considered genetically uniform.
Purpose of the Study:
- To investigate the genetic stability of the C32 IHD zebrafish strain.
- To identify potential genetic variations within the sMdh-A locus in this strain.
- To assess the impact of bisexually maintained reproduction on genetic homogeneity in cloned zebrafish.
Main Methods:
- Microsatellite marker analysis to genotype the sMdh-A locus.
- Comparison of allele frequencies in the C32 strain over time.
- Estimation of mutation rates within the studied zebrafish population.
Main Results:
- The C32 IHD zebrafish strain was found to be polyallelic at the malate dehydrogenase (sMdh-A) locus.
- A novel variant allele at the sMdh-A locus has become predominant within the last 10 generations.
- The mutation rate in zebrafish is sufficiently high to challenge long-term genetic homogeneity in cloned lines.
Conclusions:
- Long-term genetic homogeneity in bisexually maintained IHD zebrafish clones cannot be assumed.
- Researchers using these models should be aware of potential genetic variability.
- To maximize genetic uniformity, experimental subjects should be sourced soon after a cloning event.