Evaluation of Single Nucleotide Polymorphism Typing with Invader on PCR Amplicons and Its Automation

Table 3.

Summary of Loci and Number of Discordant Typings

Locus Chr.location Conven-tional method G/C content (%) Homology to Chr. 22 (bK246H3) (%) Homology to repeat elements Total Discord. Conventional assay Invader assay Failure rate Total discord.between 96- and 384-well formats
no. false hets no. false homs no. false hets no.false homs 96-well format (%) 384-well format (%)
INSg.-23A>T 11p15 RFLP (HphI) 65 8 3 5 0.8
INSg.1127C>T 11p15 RFLP (PstI) 67 0 1.3
LRP5g.-14279A>G 11q13 cRFLP (NruI) 61 0 7 1 6 2.6
LRP5g.-11215T>A 11q13 N.T. 30 0 AluY N.T. 2.6
LRP5g.-11094G>A 11q13 RFLP (BstX1) 61 0 AluY 2 1 1 1.8
LRP5g.-10088G>A 11q13 RFLP (FauI) 59 0 13 7 6 1.0 3.4 0
LRP5g.-9693G>A 11q13 RFLP (Acil) 59 0 1 1 1.3 2.9 2
LRP5g.-5802G>C 11q13 RFLP (HincII) 56 93 1 1 1.8 2.6 1
LRP5g.-5677C>T 11q13 RFLP (MspI) 48 97 AluSp 2 2 3.4 1.6 0
LRP5g.-5264G>A 11q13 RFLP (AfIII) 51 93 AluJb 2 2 2.1 2.3 0
LRP5g.-864A>G 11q13 RFLP (MspI) 63 89 6 2 1 3 2.6 2.3 1
LRP5g.2221C>T 11q13 cRFLP (Hph) 48 92 8 1 7 4.9
LRP5g.3103C>G 11q13 RFLP (PflMI) 56 97 0 1.8
LRP5g.4780G>C 11q13 RFLP (EcoNI) 64 58 8 1 7 3.4
LRP5g.5257T>G 11q13 cRFLP (SnaBI) 36 69 4 2 2 2.6
LRP5g.7374G>A 11q13 RFLP (AvaI) 50 83 AluJb 7 1 6 2.9
LRP5g.13963C>T 11q13 N.T. 66 79 N.T. 1.8
LRP5g.24964C>T 11q13 RFLP (MnlI) 59 0 1 1 1.0
LRP5g.28149C>T 11q13 RFLP (MboII) 44 0 2 2 1.6
LRP5g.31856G>A 11q13 RFLP (DpnI) 60 0 AluSx 3 1 1 1 0.5
LRP5g.35592T>C 11q13 N.T. 54 0 N.T. 2.6
LRP5g.42125G>T 11q13 N.T. 49 0 N.T. 1.0
LRP5g.45704G>A 11q13 N.T. 61 92 AluJb N.T. 1.3
EST3c.448G>A 11q13 RFLP (PstI) 57 1 1 5.7
EST4c.3021-3026del 11q13 Length polymorph. 24 0 7.3 5.2 0
EST4c.3211G>A 11q13 cRFLP (NlaIII) 31 0 3.6 3.4 0
EST4c.3403G>A 11q13 N.T. 34 N.T. 1.8 3.6 0
IL4-Rc.1216T>C 16p12 RFLP (Tsp45I) 59 3 1 1 1 1.8
IL4-Rc.1902A>G 16p12 ARMs 66 2 1 1 0.5
GCG-R G40S 17q25 RFLP (BstEII) 54 0 6.0
ICAM-1 G241R 19p13 cRFLP (Stu1)/ARMS 67 7 1 6 1.6
ICAM-1 K469E 19p13 RFLP (MvnI)/ARMS 60 4 1 3 1.0
CTLA4g.-651C>T  2q33 RFLP (Acil) 34 0 2.6
CTLA4g.49A>G  2q33 RFLP (Bbvl)/dot blot 56 5 1 2 1 1.0
CTLA4g.920C>T  2q33 RFLP (DdeI) 38 1 1 1.0
CTLA4g.-318C>T  2q33 RFLP (MseI) 24 0 0.8
IRS1 G972R  2q36 RFLP (SmaI) 68 0 4.9
 Total 98 19 26 4 49 4
 Error rate (%) 0.82 0.16 0.22 0.03 0-.41 2.34 3.03 0.12
  • (N.T.) The locus was not typed conventionally.

  • Percentage of bases with G or C 35 bp either side of the SNP.

  • Percentage of bases homologous to bac 6K246H3 35 bp either side of the polymorphism.

  • Number of individuals discordant between the two typing methods after a single typing. (N.T.) Not tested.

  • Outcome of repeat typing. Each discordant individual was typed at least 4 times, twice with each technology. In all but one case a consensus genotype was established and one initial typing was incorrect.

  • A single individual consistantly typed as heterozygote with Invader technology but homozygote with PCR–RFLP.

This Article

  1. Genome Res. 10: 330-343

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