Page Banner

United States Department of Agriculture

Agricultural Research Service

Related Topics

Research Project: DEVELOPMENT AND FIELD EVALUATION OF GENOME-WIDE MARKER-ASSISTED SELECTION (GWMAS) OVER MULTIPLE GENERATIONS IN COMMERCIAL POULTRY

Location: Avian Disease and Oncology Laboratory

Project Number: 3635-31320-009-06
Project Type: Specific Cooperative Agreement

Start Date: Oct 01, 2008
End Date: Aug 31, 2013

Objective:
As described in grant entitled “Development and field evaluation of genome-wide marker-assisted selection (GWMAS) over multiple generations in commercial poultry,” the consortium that includes members from Wageningen University will: 1. Develop a Higher Density and More Informative Chicken SNP Panel; 2. Refine the Theoretical and Molecular Aspects of GWMAS 3. Field Assessment of GWMAS; and 4. Further Improve the Chicken Genome Assembly. For this agreement, only Objectives 1, 3, and 4 apply.

Approach:
For Objective #1, to generate the SNPs that we will genotype, we will (1) Divide the latest chicken sequence assembly into ~60K bins of equal size based on chromosomal recombination rates, (2) Assign previously screened SNPs that were validated, have a MAF>0.1, and known to be segregating in one or more lines of interest to the appropriate bin, (3) For bins without a validated marker, identify 3 or more SNPs from either the public databases or our own sequencing efforts, giving preference to those SNPs identified two or more times in the discovery process, and (4) Submit all SNPs and their flanking sequences to the commercial vendor producing the SNP array to determine if a suitable assay can be designed. For Objective #3, DNA from Hendrix Genetics chickens will be extracted, quantified, and the concentration adjusted prior to shipment to our genotyping facility. For Objective #4, the East Lansing and Wageningen University reference families will be genotyped with the 60K SNP chip, and an improved consensus genetic map generated and aligned to the genome sequence to detect discrepancies in genetic marker order.

Last Modified: 4/19/2014
Footer Content Back to Top of Page