Before massive sequencing technologies became available, phenotype-related ENU-induced mutations were short-listed in a lengthy procedure of out-crossing and meiotic mapping that identified linkage chromosomes, or finer linkage regions of approximately 20 MB.
This species is amenable for genetic analysis in which large-scale mutagenesis screens have been successfully performed, and a large amount of genomic and expressed sequence tags (ESTs) data, BAC libraries and fine genetic linkage maps have been accumulated [ 25].
Nevertheless, as discussed above, BAC-FISH has several advantages in initial physical characterization of the whole genome, which enables concentration of mapping efforts on a specific chromosome region by fine-scale linkage analysis.
To date, the pea aphid genome lacks a fine-scale linkage map.
Increasingly fine-grained linkage maps are an important technical resource for the research community, enabling the development of more sophisticated genetic mapping methods and the explosive growth of complex-traits analysis in the laboratory mouse (Flint and Mackay 2009; Flint and Eskin 2012).
The CHeReL routinely performs these linkages, and standard operating procedures exist to fine tune the linkage sensitivity and specificity depending on the cohort data being linked.
The genetic architectures of many major neuropsychiatric disorders remain unresolved despite decades of linkage, fine mapping, genomewide linkage (GWLS), candidate gene association and genomewide association studies (GWAS).
Apparent replication "failures" using approach (1) could thus relate to sample-to-sample differences in fine patterns of linkage disequilibrium and/or different amounts of information provided by markers with population-specific differences in allele frequencies.
Although the current European- and African-American samples were recruited in parallel and evaluated with the same SNPs, the racial/ethnic differences between the participants suggest that the samples are likely to manifest differences in fine patterns of linkage disequilibrium and in phase of association at many loci.
