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Fingerprinting Progress Report Ross Whetten Professor Forestry & Environmental Resources Overview • Review of basic genetics terminology • Objectives of fingerprinting project • Strategy • Results to date • Work to be completed Review of terminology • “Genetic fingerprint” = DNA sequence markers • Each tree has two copies of every chromosome • Potentially different versions of each DNA sequence • Two copies are identical = “homozygous” • Two copies are different = “heterozygous” Homozygous parent X Heterozygous parent Progeny get one copy of each DNA (chromosome) from each parent, recombination mixes things up Review of terminology • “Single nucleotide polymorphism”, or SNP, means a change of a single base in the DNA sequence • “Quantitative Trait Locus”, or QTL, means a region of DNA that affects a trait of interest • “Gene” means a region of DNA that encodes some product needed by the cell. • “Regulatory sequences” control expression of genes, but are not always near the genes they control Example – Blue Eyes in Humans A small segment of human chromosome 15 (~0.5%), shown in the Variation Viewer (http://www.ncbi.nlm.nih.gov/variation). Two genes are shown – the vertical lines are “exons” that encode proteins; the “introns” between exons are discarded. Alignment of two human sequences with the same region of the mouse genome shows a SNP between the two human versions of the gene. This SNP accounts for about 70% of the blue-eye vs brown-eye color differences in human populations, but is completely recessive. Two C alleles = blue eyes Who cares about fingerprinting? • Seedling buyers should care about family identity • The key predictor of seedling performance • Fingerprinting will allow confirmation of identity • Paper records are the best method to date; fingerprinting will be a useful supplement Objectives • Screen candidate marker regions • Use test population with family structure as control • Select markers that work well • Collect samples from 4th-cycle parents • And ancestors, when those are known • Extract DNA, analyze fingerprints, store in TIProot Strategy • Start with data from previous projects • PINEMAP, CTGN, ADEPT2 grants • Select regions to screen for possible SNPs • Amplify and sequence target regions from test population samples • Analyze data for SNP markers that will be useful for fingerprinting Results to date • Two sets of target regions identified • Set 1 =144 targets; Set 2 = 151 targets • Foliage samples collected in May 2015 from 2350 ACE progeny; DNA isolated in September 2015 • Foliage samples collected in October 2015 from > 1000 grafts of 237 different 4th-cycle parents at Arrowhead Breeding Center; DNA isolated in November 2015 Results to date • Set 1 tested on 960 samples of ACE progeny • About 50 target regions gave acceptable data • Set 2 tested on 24 samples; 12 haploid and 12 diploid • About 90 target regions gave acceptable data Work to be completed • Finalize a set of about 140 target regions to test on ABC DNA samples • Work with Purchasing Department to set up fingerprinting contract • Submit samples; analyze data • Organize foliage collection from remaining 4thcycle parents in cooperator orchards • Extract DNA; complete fingerprinting Summary • Fingerprinting 4th-cycle breeding population is well underway • Fingerprints will be stored in TIProot • Candidate SNPs and target regions identified; data available for download from TIProot • Limiting factor for cooperators is DNA extraction; no reliable commercial service provider available yet