1 FHF prosjekt : Sporing av laks: SNP-tilnærming Matthew Kent, Harald Grove, Teresa Andersstuen, Mariann Arnyasi, Kristil Sundsaasen, Sigbjørn Lien CIGENE, Dept Animal and Aquaculture Sciences, Norwegian University of Life Sciences UMB, Ås, NORWAY
2 SNP marker panel development ca. 6,000 SNPs genotyped in 756 samples belonging to MOWI, Salmobreed and AquaGen breeding populations was analysed. A subset of SNPs (n=114) was identified using the following criteria: SNPs must have high minor allele frequency (MAF >0.45) in all three breeding populations 3-4 SNPs from each chromosome and a wide physical distribution 3 SNPs from mitochondrial genome to provide extra assurance for female assignment
3 Genotyping protocol A panel of 60 SNPs was genotyped using Sequenom MassArray 4 instrument. Genotype assignment is automatic but usually requires manual inspection DNA extraction from fin clips has been semi-automated using a BioMek3000 robot. Process includes tissue digestion, protein nucleotide separation, and DNA precipitation.
4 Genotyping protocol - Challenges DNA extraction is producing sufficient amounts of high quality material, however contaminant in the DNA extract seems to inhibit genotyping. This can be overcome by dilution. Genotyping 60 markers in a single reaction has not been robust, and the set is run as 2 separate reactions. Holes in the genotyping dataset weakens the power to assign. Missing parental genotypes is the most damaging situation.
5 Assignment principles Assignment script looks for incorrect Mendelian inheritance (MI) patterns to eliminate impossible offspring-parent pairings. For example: Offspring 1 (AA) Offspring 2 (AB) Offspring 3 (BB) Parent1 (AA)? Possible match Possible match Impossible match After identifying candidate parents, software considers MI patterns within all possible parent-parent-offspring to eliminate incorrect trios. For example: Offspring 2 (AB)? P1 (AA) + P2 (BB) Possible trio P1 (AA) + P3 (AA) Impossible trio
6 Assignment software - Challenges An incomplete set of genotypes (ie not all 60 SNPs) can lead to offspring being (i) unassigned, (ii) assigned to 1 parent only, (iii) assigned to multiple trios Additional information can be used to increase certainty and reduce trio combinations. Examples of additional information are: Sex of parents Parental crossings (ie mating scheme) Relationships between parents
7 Validation study 1 many offspring, few parents Samples from AquaGen breeding program, selected by NVH and sent with anonymous IDs to CIGENE for assignment. Includes: 230 Parents 520 Offspring 40 unrelated offspring Require minimum 40 genotypes for assignment, allow 1 Mendelian mismatch : 16 offspring (2.8%) failed to produce >40 genotypes
8 Validation study 1 - assignment Category Description Number Unique full Unique Assignment, valid parent couple 496 Uncertain / unrelated / missing 230 Parents 520 Offspring 40 unrelated offspring One parent only / no parents / insufficient genotypes 64 Assignment validation rate = 97%
9 Validation study 2 Many parents, few offspring Samples selected by NVH and sent with anonymous IDs to CIGENE for assignment. Includes: 496 Parents 279 Offspring Require minimum 40 genotypes for assignment, allow 1 Mendelian mismatch: 10 offspring (3.5%) failed to produce >40 genotypes
10 Validation study 2 - assignment Category Description Number Unique couple Unique Assignment, parent couple 185 Unique single Only one parent, other unknown 33 Multiple - couple More than one valid couple 9 Uncertain / Missing 496 Parents 279 Offspring Multiple parent options and no valid couple/ insufficient genotypes 52 Assignment validation rate = 98%
11 Validation study 3 Wild fish 95 wild fish (5 fish x 19 rivers) provided by NINA Category Description Number Mismatch A Mismatches 3 87 Mismatch - B 2 Mismatches 6 Uncertain / Missing Multiple parent options and no valid couple/ insufficient genotypes 2 No wild fish assigned to known parents
12 Extraction protocols To assess issues related to practical implementation of genetic tracing, samples were stored, extracted and genotyped under different conditions. Variables included: Tissue type (bukfinne, fettfinne, skjell) Preservation Method (ethanol, red-spirit, frozen) Extraction (chelex, precipitation) Operator (3 sites) Samples genotyped with SNPs, number of genotypes used to represent DNA quality.
13 Significant effects Statistical analysis effect of tissue, preservation, extraction, and site on # genotypes reported generalized linear models with gamma distribution and identity link function # genotypes ranges from 1 60, mean 52, median 56 Effect of... on number of genotypes P value Tissue Not significant 0,7 Preservation Not significant 0,8 Extraction Site Significant (precip gave 3.7 more genotypes than chelex) Significant (Sites A and C gave 7-8 more genotypes than B) 0,018 0,001
14 NORWEGIAN UNIVERSITY OF LIFE SCIENCES Site vs. #genotypes Lab A Lab B Lab C
15 NORWEGIAN UNIVERSITY OF LIFE SCIENCES Site and Extraction vs. #genotypes Chelex Presip Chelex Presip Chelex Presip Lab A Lab B Lab C
16 Conclusion SNP based technology demonstrates good ability to assign farmed fish to their parents. The current SNP set has the power to differentiate wild and farmed. Standardization (and optimization) of the DNA extraction methodology is important. Further implementation of SNP-tracing would benefit from a redesign of the SNP set to include more markers and/or achieve single assay throughput.
17 Synergies Routine testing of salmon DNA using SNP technology is performed large scale today, including: Sample collection, sample storage, DNA extraction, genotyping and reporting of data Thoughtful design of SNP panels can create added value, ie markers can be included that not only allow for tracing, but can provide broodstock information to producers.
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