Lw. Chenliu et al., SELECTION OF HYBRIDS BY AFFINITY CAPTURE (SHAC) - A METHOD FOR THE GENERATION OF CDNAS ENRICHED IN SEQUENCES FROM A SPECIFIC CHROMOSOME REGION, Genomics, 30(2), 1995, pp. 388-392
We have established a method for preparing cDNA sublibraries enriched
in sequences from specific chromosome regions, called selection of hyb
rids by affinity capture (SHAC). This procedure can be described in tw
o stages. In the first stage, a particular chromosome region, in this
study mouse chromosome 11, was microdissected, followed by PCR amplifi
cation with a universal degenerate primer. This material is referred t
o as the ''target'' DNA. In the second stage, a mouse liver cDNA libra
ry with unique linker-adapter ends, referred to as the ''source'' cDNA
, was hybridized to the biotin-labeled target DNA prepared during the
first stage. The resulting DNA duplexes were captured by streptavidin-
coated magnetic beads. The cDNAs were released from their biotin-label
ed target homologs by alkaline denaturation and recovered by PCR ampli
fication. These cDNAs were referred to as the SHACcDNAs. Specificity o
f the SHACcDNA to chromosome 11 was verified by FISH analysis. To exam
ine representation of the SHACcDNA, we confirmed the presence of seven
genes or single-copy DNA segments known to be localized on mouse chro
mosome 11, using a dot blot assay. In addition, a second round of SHAC
was performed to achieve even higher specificity for the resulting ch
romosome 11 SHACcDNA. The SHAC technology should facilitate constructi
on of cytogenetically defined cDNA libraries and should assist in the
fields of gene discovery and genome mapping. (C) 1995 Academic Press,
Inc.