Table 1 Allele frequencies for SNPs present on the genotyping array that exhibit a strong association with a phenotype (Phen-gen p-value < 10−8), and are in the 1q23 chromosomal region

From: Strong selection during the last millennium for African ancestry in the admixed population of Madagascar

 

SNP

Ref/alt

Associated phenotype

Observed frequency

Expected frequency (mean ± SD)

Probability of observed data

    

Africa (%)

East Asia (%)

Madagascar (%)

  

SD9

rs1101999

T/C

Asthma

31

0

32

19 ± 1.9%

<10−6

 

rs3026968

C/T

Chemokine CCL2

3

53

8

22 ± 2.1%

<10−6

 

rs3093059

A/G

C-reactive protein

32

15

35

25 ± 2.2%

2.10−5

 

rs12075

A/G

Leukocyte count

2

92

7

37 ± 2.4%

<10−6

SD6

rs6684514

G/A

Erythrocyte indices

8

23

7

14 ± 1.7%

4 × 10−6

 

rs1801274

G/A

Mucocutaneous lymph node syndrome

47

72

46

57 ± 2.5%

1.4 × 10−5

 

rs7528684

G/A

Diabetes mellitus, type 1

6

56

11

25 ± 2.1%

<10−6

 

rs1142287

T/C

Crohn disease

46

31

37

40 ± 2.5%

9.55 × 10−2

 

rs12566888

T/G

Platelet aggregation

35

51

36

41 ± 2.5%

1.84 × 10−2

 

rs13376333

C/T

Atrial fibrillation

30

3

23

20 ± 2.0%

4.87 × 10−2

  1. The frequency observed in Madagascar is compared with that observed in Africa and East Asia, and to the expected frequency produced by admixture without selection (based on one million computer simulations15). Probability of observed data is based on the quantile of the observed frequency in the distribution of the simulation results