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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Development of a SNP linkage map and genome-wide association study for resistance to Aeromonas hydrophila in pacu (Piaractus mesopotamicus)

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Mastrochirico-Filho, Vito A. [1] ; Borges, Carolina H. S. [1] ; Freitas, Milena V. [1] ; Ariede, Raquel B. [1] ; Pilarski, Fabiana [1] ; Utsunomia, Ricardo [2] ; Carvalheiro, Roberto [3, 4] ; Gutierrez, Alejandro P. [5] ; Penaloza, Carolina [5] ; Yanez, Jose M. [6] ; Houston, Ross D. [5] ; Hashimoto, Diogo T. [1]
Total Authors: 12
[1] Sao Paulo State Univ Unesp, Aquaculture Ctr Unesp, Via Acesso Prof Paulo Donato Castellane S-N, BR-14884900 Jaboticabal, SP - Brazil
[2] Univ Fed Rural Rio de Janeiro, BR-23897000 Seropedica, RJ - Brazil
[3] Sao Paulo State Univ Unesp, Sch Agr & Veterinarian Sci, Jaboticabal, SP - Brazil
[4] CNPq, Natl Council Sci & Technol Dev, BR-71605001 Brasilia, DF - Brazil
[5] Univ Edinburgh, Sch Vet Studies, Roslin Inst & Royal Dick, Edinburgh EH25 9RG, Midlothian - Scotland
[6] Univ Chile, Fac Ciencias Vet & Pecuarias, Santiago - Chile
Total Affiliations: 6
Document type: Journal article
Source: BMC Genomics; v. 21, n. 1 SEP 29 2020.
Web of Science Citations: 0

BackgroundPacu (Piaractus mesopotamicus) is one of the most important Neotropical aquaculture species from South America. Disease outbreaks caused by Aeromonas hydrophila infection have been considered significant contributors to the declining levels of pacu production. The current implementation of genomic selection for disease resistance has been adopted as a powerful strategy for improvement in fish species. This study aimed to investigate the genetic architecture of resistance to A. hydrophila in pacu via Genome-Wide Association Study (GWAS), the identification of suggestive Quantitative Trait Loci (QTLs) and putative genes associated with this trait. The genetic data were obtained from 381 juvenile individuals belonging to 14 full-sibling families. An experimental challenge was performed to gain access to the levels of genetic variation for resistance against the bacteria using the following trait definitions: binary test survival (TS) and time of death (TD).ResultsThe analyses of genetic parameters estimated moderate heritability (h(2)) for both resistance traits: 0.20 ( 0.09) for TS and 0.35 (+/- 0.15) for TD. A linkage map for pacu was developed to enable the GWAS, resulting in 27 linkage groups (LGs) with 17,453 mapped Single Nucleotide Polymorphisms (SNPs). The length of the LGs varied from 79.95 (LG14) to 137.01 (LG1) cM, with a total map length of 2755.60cM. GWAS identified 22 putative QTLs associated to A. hydrophila resistance. They were distributed into 17 LGs, and were considered suggestive genomic regions explaining >1% of the additive genetic variance (AGV) for the trait. Several candidate genes related to immune response were located close to the suggestive QTLs, such as tbk1, trim16, Il12rb2 and lyz2.Conclusion This study describes the development of the first medium density linkage map for pacu, which will be used as a framework to study relevant traits to the production of this species. In addition, the resistance to A. hydrophila was found to be moderately heritable but with a polygenic architecture suggesting that genomic selection, instead of marker assisted selection, might be useful for efficiently improving resistance to one of the most problematic diseases that affects the South American aquaculture. (AU)

FAPESP's process: 18/08416-5 - Low-cost genome-wide association study and genomic predictions for resistance to Aeromonas hydrophila in pacu (Piaractus mesopotamicus)
Grantee:Diogo Teruo Hashimoto
Support type: Regular Research Grants
FAPESP's process: 16/21011-9 - Integrated analysis of quantitative genetics and genomics to select genotypes of pacu (Piaractus mesopotamicus)
Grantee:Diogo Teruo Hashimoto
Support type: Regular Research Grants
FAPESP's process: 17/26900-9 - RNA-seq and RAD-seq techniques for genetic characterization of pacu (Piaractus mesopotamicus) resistant to the bacteria Aeromonas hydrophila
Grantee:Vito Antonio Mastrochirico Filho
Support type: Scholarships abroad - Research Internship - Doctorate
FAPESP's process: 16/18294-9 - Integration of genomic methods for genotypes selection of pacu (Piaractus mesopotamicus) resistant to Aeromonas hydrophila bacteria
Grantee:Vito Antonio Mastrochirico Filho
Support type: Scholarships in Brazil - Doctorate