Assessing the contribution of 38 genetic loci to the risk of type 2 diabetes in the Saudi Arabian Population

Nasser M. Al-Daghri, Khalid M. Alkharfy, Majed S. Alokail, Amal M. Alenad, Omar S. Al-Attas, Abdul Khader Mohammed, Shaun Sabico, Omar Al Bagha

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Abstract

Background Previous genome-wide association studies have identified multiple type 2 diabetes (T2D) genetic risk loci in many populations. However, the contribution of these loci to T2D in the Middle Eastern populations with high T2D prevalence is unknown. Methods Here, we investigated the association of 38 T2D risk loci in the Saudi Arabian population (1166 patients with T2D and 1235 healthy controls), which has one of the world's highest prevalence of T2D. Results Eight common genetic variants showed a significant association with T2D in our study population. The effect sizes of these loci were comparable to those previously identified in other populations with the exception of HNF4A, which showed a trend for larger effect size in our study population (OR = 1·27) compared to that reported in South Asian populations (OR = 1·09; I 2 = 65·9). Analysis of risk allele scores (RASs) defined by the 8 loci showed that subjects in the top RAS quintile (n = 480) had 2·5-fold increase in disease risk compared to those in the bottom quintile (n = 480; P = 9·5 × 10-12). RASs were also associated with fasting glucose level (β = 0·12; P = 2·2 × 10-9), but not with BMI (P = 0·19). Analysis of a subgroup of subjects with BMI≤30 resulted in two additional loci (SLC30A8; P = 0·03, HMG20A; P = 0·02) showing significant association with T2D. Conclusions We have shown for the first time that variants at WFS1, JAZF1, SLC30A8, CDKN2A/B, TCF7L2, KCNQ1, HMG20A, HNF4A and DUSP9 are associated with T2D in the Saudi population. Our findings also suggest substantial overlap of T2D risk loci across many ethnic groups regardless of disease prevalence.

Original languageEnglish
Pages (from-to)532-537
Number of pages6
JournalClinical Endocrinology
Volume80
Issue number4
DOIs
Publication statusPublished - Apr 2014
Externally publishedYes

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Genetic Loci
Type 2 Diabetes Mellitus
Population
Alleles
Genome-Wide Association Study
Ethnic Groups
Fasting
Glucose

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism

Cite this

Al-Daghri, N. M., Alkharfy, K. M., Alokail, M. S., Alenad, A. M., Al-Attas, O. S., Mohammed, A. K., ... Al Bagha, O. (2014). Assessing the contribution of 38 genetic loci to the risk of type 2 diabetes in the Saudi Arabian Population. Clinical Endocrinology, 80(4), 532-537. https://doi.org/10.1111/cen.12187

Assessing the contribution of 38 genetic loci to the risk of type 2 diabetes in the Saudi Arabian Population. / Al-Daghri, Nasser M.; Alkharfy, Khalid M.; Alokail, Majed S.; Alenad, Amal M.; Al-Attas, Omar S.; Mohammed, Abdul Khader; Sabico, Shaun; Al Bagha, Omar.

In: Clinical Endocrinology, Vol. 80, No. 4, 04.2014, p. 532-537.

Research output: Contribution to journalArticle

Al-Daghri, NM, Alkharfy, KM, Alokail, MS, Alenad, AM, Al-Attas, OS, Mohammed, AK, Sabico, S & Al Bagha, O 2014, 'Assessing the contribution of 38 genetic loci to the risk of type 2 diabetes in the Saudi Arabian Population', Clinical Endocrinology, vol. 80, no. 4, pp. 532-537. https://doi.org/10.1111/cen.12187
Al-Daghri NM, Alkharfy KM, Alokail MS, Alenad AM, Al-Attas OS, Mohammed AK et al. Assessing the contribution of 38 genetic loci to the risk of type 2 diabetes in the Saudi Arabian Population. Clinical Endocrinology. 2014 Apr;80(4):532-537. https://doi.org/10.1111/cen.12187
Al-Daghri, Nasser M. ; Alkharfy, Khalid M. ; Alokail, Majed S. ; Alenad, Amal M. ; Al-Attas, Omar S. ; Mohammed, Abdul Khader ; Sabico, Shaun ; Al Bagha, Omar. / Assessing the contribution of 38 genetic loci to the risk of type 2 diabetes in the Saudi Arabian Population. In: Clinical Endocrinology. 2014 ; Vol. 80, No. 4. pp. 532-537.
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AU - Alenad, Amal M.

AU - Al-Attas, Omar S.

AU - Mohammed, Abdul Khader

AU - Sabico, Shaun

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N2 - Background Previous genome-wide association studies have identified multiple type 2 diabetes (T2D) genetic risk loci in many populations. However, the contribution of these loci to T2D in the Middle Eastern populations with high T2D prevalence is unknown. Methods Here, we investigated the association of 38 T2D risk loci in the Saudi Arabian population (1166 patients with T2D and 1235 healthy controls), which has one of the world's highest prevalence of T2D. Results Eight common genetic variants showed a significant association with T2D in our study population. The effect sizes of these loci were comparable to those previously identified in other populations with the exception of HNF4A, which showed a trend for larger effect size in our study population (OR = 1·27) compared to that reported in South Asian populations (OR = 1·09; I 2 = 65·9). Analysis of risk allele scores (RASs) defined by the 8 loci showed that subjects in the top RAS quintile (n = 480) had 2·5-fold increase in disease risk compared to those in the bottom quintile (n = 480; P = 9·5 × 10-12). RASs were also associated with fasting glucose level (β = 0·12; P = 2·2 × 10-9), but not with BMI (P = 0·19). Analysis of a subgroup of subjects with BMI≤30 resulted in two additional loci (SLC30A8; P = 0·03, HMG20A; P = 0·02) showing significant association with T2D. Conclusions We have shown for the first time that variants at WFS1, JAZF1, SLC30A8, CDKN2A/B, TCF7L2, KCNQ1, HMG20A, HNF4A and DUSP9 are associated with T2D in the Saudi population. Our findings also suggest substantial overlap of T2D risk loci across many ethnic groups regardless of disease prevalence.

AB - Background Previous genome-wide association studies have identified multiple type 2 diabetes (T2D) genetic risk loci in many populations. However, the contribution of these loci to T2D in the Middle Eastern populations with high T2D prevalence is unknown. Methods Here, we investigated the association of 38 T2D risk loci in the Saudi Arabian population (1166 patients with T2D and 1235 healthy controls), which has one of the world's highest prevalence of T2D. Results Eight common genetic variants showed a significant association with T2D in our study population. The effect sizes of these loci were comparable to those previously identified in other populations with the exception of HNF4A, which showed a trend for larger effect size in our study population (OR = 1·27) compared to that reported in South Asian populations (OR = 1·09; I 2 = 65·9). Analysis of risk allele scores (RASs) defined by the 8 loci showed that subjects in the top RAS quintile (n = 480) had 2·5-fold increase in disease risk compared to those in the bottom quintile (n = 480; P = 9·5 × 10-12). RASs were also associated with fasting glucose level (β = 0·12; P = 2·2 × 10-9), but not with BMI (P = 0·19). Analysis of a subgroup of subjects with BMI≤30 resulted in two additional loci (SLC30A8; P = 0·03, HMG20A; P = 0·02) showing significant association with T2D. Conclusions We have shown for the first time that variants at WFS1, JAZF1, SLC30A8, CDKN2A/B, TCF7L2, KCNQ1, HMG20A, HNF4A and DUSP9 are associated with T2D in the Saudi population. Our findings also suggest substantial overlap of T2D risk loci across many ethnic groups regardless of disease prevalence.

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