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Table 2 HLA allele imputation accuracy in ACCESS African Americans for HLA class II genes HLA-DRB1 , − DQB1 , and –DPB1

From: Performance of HLA allele prediction methods in African Americans for class II genes HLA-DRB1, −DQB1, and –DPB1

   

Testing set

   

All

PP > 0.5

Method

Gene

Allele field

N

Accuracy

N

Call rate

Accuracy

HLA*IMP:02*

DRB1

One

325

93.2

268

82.5

94.8

  

Two

325

83.8

268

82.5

87.3

 

DQB1

One

325

96.3

297

91.4

97.3

  

Two

325

93.2

297

91.4

94.6

 

DPB1§

One

  

Two

HIBAG†

DRB1

One

325

89.5

135

41.5

98.1

  

Two

325

78.8

135

41.5

94.4

 

DQB1

One

325

96.6

170

52.3

98.8

  

Two

325

87.1

170

52.3

92.4

 

DPB1§

One

325

69.5

111

34.2

89.2

  

Two

325

69.4

111

34.2

89.2

HIBAG ACCESS‡

DRB1

One

164

95.4

113

68.9

99.1

  

Two

164

89.6

113

68.9

96.0

 

DQB1

One

188

95.4

166

88.3

99.7

  

Two

188

97.6

166

88.3

99.1

 

DPB1§

One

250

87.4

147

58.8

98.3

  

Two

250

86.4

147

58.8

98.0

BEAGLE ACCESS‡

DRB1

One

164

78.7

  

Two

164

72.3

 

DQB1

One

188

96.0

  

Two

188

97.9

 

DPB1§

One

250

65.2

  

Two

250

64.4

  1. Abbreviations: PP denotes, posterior prediction probability; N, count; Accuracy, imputation accuracy.
  2. *HLA*IMP:02 is described in Dilthey et al. 2013. In this version of the software, reference data for HLA-DPB1 was not available for the African ancestry reference panel.
  3. †HIBAG African ancestry model (published online 8/10/2012).
  4. ‡The models trained on the subset of ACCESS African Americans with training samples selected at random (from a total of 325) to match the number of subjects used to construct the published HIBAG African ancestry models: HLA-DRB1 (n = 161), HLA-DQB1 (n = 137), and HLA-DPB1 (n = 75).
  5. §One- and two-field estimates will be very similar for HLA-DPB1 as the first field uniquely identifies the two-field alleles, with the exceptions of *02:01 and *0202, and *04:01 and *04:02.