DNA Enrichment by Allele-Specific Hybridization (DEASH): A Novel Method for Haplotyping and for Detecting Low-Frequency Base Substitutional Variants and Recombinant DNA Molecules

Table 1.

Efficiencies of Bio-ASOs Directed to Different Human SNPs


SNP allele

Typea

Genomic region

Location

Bio-ASO sequence

Competitor ASO sequence

% GCb

Annealing temp.c

Target, kbd

% Yield

Purification
BbC Tv Minisatellite MS32 Single Copy Bio-AATAGGGAGACGATAAAG AATAGGGAGAGGATAAAG 39 42° 12.5 20 200 ×
BbG Tv Minisatellite MS32 Single copy Bio-AATAGGGAGAGGATAAAG AATAGGGAGACGATAAAG 39 42° 10.2 60 100 ×
AB2T Tv MHC HLA-DOA region Single copy Bio-GTTTGTTGTTTTTTGTTT GTTTGTTGTTTGTTGTTT 22 35° 7.0 45 >300 ×
AB12/5AC Tv+Ti MHC HLA-DOA region In Alu Bio-AACCCCGTATCCACTGAA AACCCCGTCTCTACTGAA 50 40° 7.0 50 >300 ×
AB13A Tv MHC HLA-DOA region In Alu Bio-TGAAAACACAAAAAAAAT TGAAAACACACAAAAAAT 17 35° 7.0 65 40 ×
AB14C Ti MHC HLA-DOA region Single copy Bio-ACTAATGATTCACTAACA ACTAATGATTTACTAACA 28 40° 7.0 45 300 ×
JJK6A Ti MHC HLA-DMB region Single copy Bio-GGTGAGAGGAAAGAAGTG GGTGAGAGGAGAGAAGTG 50 45° 6.6 65 120 ×
JJK8G Tv MHC HLA-DMB region Single copy Bio-AACGCGTTGAGCCCACAT AACGCGTTGACCCCACAT 56 50° 6.6 60 120 ×
JJK10C Ti MHC HLA-DMB region Single copy Bio-AAAAGGAGTGCGTGTGTG AAAAGGAGTGTGTGTGTG 50 50° 6.6 60 13 ×
JJK12- 3 bp indel MHC HLA-DMB region Single Bio-GAAAAAAAGAGGAGTGGA AAAAAAAGAGAAGGAGTG 39 49° 6.6 60 7 ×
5053C Tv SHOX gene region Single copy Bio-CGGCTTTTGCCTTATGGA CGGCTTTTGCGTTATGGA 44 35° 9.4 30 20 ×
5543G
Tv
SHOX gene region
Single copy
Bio-GGACGGGCTGGGGTTCCT
GGACGGGCTGCGGTTCCT
72
55°
9.4
30
>200 ×
  • Each SNP was tested on restriction enzyme-digested human sperm DNA, using three rounds of DEASH extraction. Yields and purification were assayed as in Figs. 3 and 4. Yields were additionally confirmed for AB2T, JJK6A, and JJK10C by Poisson analysis of single molecule dilutions of enriched DNA (Jeffreys et al. 1998a). Further details of the MHC SNPs can be found in Jeffreys et al. (2001) and at http://www.le.ac.uk/genetics/ajj/HLA/index.html. The SHOX SNPs are described in May et al. (2002) and at http://www.le.ac.uk/ge/ajj/SHOX.

  • a Ti, transition; Tv, transversion; indel, insertion/deletion.

  • b GC content of biotinylated ASO.

  • c Annealing temperatures giving optimum haplotype separation and yield were determined empirically. The relationship between optimal annealing temperature and the GC content of the bio-ASO approximates to 29.6°C + 0.318(%GC)°C.

  • d Size of target released by restriction digestion.

This Article

  1. Genome Res. 13: 2316-2324

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