Abstract
Albinism is caused by a series of genetic abnormalities leading to reduction of melanin production. Albinism is quite frequent in catfish, but the causative gene and the molecular basis were unknown. In this study, we conducted a genome-wide association study (GWAS) using the 250 K SNP array. The GWAS analysis allowed mapping of the albino phenotype in the Hermansky–Pudlak syndrome 4 (Hps4) gene, which is known to be involved in melanosome biosynthesis. Sequencing analysis revealed that a 99-bp deletion was present in all analyzed albino catfish at the intron 2 and exon 3 junction. This deletion led to the skipping of the entire exon 3 which was confirmed by RT-PCR. Therefore, Hps4 was determined to be the candidate gene of the catfish albinism.
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Abbreviations
- HPS:
-
Hermansky–Pudlak syndrome
- UV:
-
Ultraviolet
- OCA:
-
Oculocutaneous albinism
- GWAS:
-
Genome-wide association study
- QTL:
-
Quantitative trait loci
- SNP:
-
Single nucleotide polymorphism
- PCA:
-
Principal component analysis
- GEF:
-
Guanine nucleotide exchange factor
- BLOC3S2:
-
Biogenesis of lysosome-related organelles complexes 3, subunit 2
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Acknowledgements
This project was partially supported by a competitive AFRI Grant from the Animal Genomics, Genetics and Breeding Program of the USDA National Institute of Food and Agriculture (Grant Number 2015-67015-22907), and partially by a competitive AFRI Grant from the Animal Health Program (Grant Number 2015-67015-22975) of the USDA National Institute of Food and Agriculture (NIFA). We thank Lyudmila Kaltenboeck, Huseyin Kucuktas, Zihao Yuan, and Changxu Tian for technical assistance. We would also like to thank Jiaren Zhang and Fanyue Sun for sample collection.
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The authors declare no conflict of interest. All experiments involving the handling and treatment of fish were approved by the Institutional Animal Care and Use Committee (IACUC) at Auburn University. Tissue samples were collected after euthanasia. All animal procedures were carried out according to the Guide for the Care and Use of Laboratory Animals and the Animal Welfare Act in the United States.
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Communicated by S. Hohmann.
Y. Li and X. Geng authors contributed equally to this work.
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438_2017_1302_MOESM2_ESM.tif
Fig. S1 Sample structure identified by principal component analysis with the first two principal component scores. The coordinates are the first two principal component scores. (TIF 446 KB)
438_2017_1302_MOESM3_ESM.tif
Fig. S2 Sequence analyses revealed the skipping of exon 3 in the Hps4 gene of albino catfish. Characters in orange color is the mRNA sequence of exon 3. (TIF 93 KB)
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Li, Y., Geng, X., Bao, L. et al. A deletion in the Hermansky–Pudlak syndrome 4 (Hps4) gene appears to be responsible for albinism in channel catfish. Mol Genet Genomics 292, 663–670 (2017). https://doi.org/10.1007/s00438-017-1302-8
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DOI: https://doi.org/10.1007/s00438-017-1302-8