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GAB2 gene does not modify the risk of Alzheimer’s disease in Spanish APOE 4 carriers

  • GAB2 Gene Does Not Modify the Risk of Alzheimer’s Disease in Spanish APOE 4 Carriers
  • Published:
JNHA - The Journal of Nutrition, Health and Aging

Abstract

Objectives

The genetic basis of Alzheimer’s disease (AD) is being analyzed in multiple whole genome association studies (WGAS). The GAB2 gene has been proposed as a modifying factor of APOE ε4 allele in a recent case-control WGAS conducted in the US. Given the potential application of these novel results in AD diagnostics, we decided to make an independent replication to examine the GAB2 gene effect in our series.

Design

We are conducting a multicenter population-based study of AD in Spain.

Participants

We analyzed a total of 1116 Spanish individuals. Specifically, 521 AD patients, 475 controls from the general population and 120 neurologically-normal elderly controls (NNE controls).

Methods

We have genotyped GAB2 (rs2373115 G/T) and APOE rs429358 (SNP112)/rs7412 (SNP158) polymorphisms using real time-PCR technologies.

Results

As previously reported in Spain, APOE ε4 allele was strongly associated with AD in our series (OR=2.88 [95% C.I. 2.16–3.84], p=7.38E-11). Moreover, a large effect for ε4/ ε4 genotype was also observed (OR=14.45 [95% C.I., 3.34–125.2], p=1.8E-6). No difference between the general population and the NNE controls series were observed for APOE genotypes (P>0.61). Next, we explored GAB2 rs2373115 SNP single-locus association using different genetic models and comparing AD versus controls or NNE controls. No evidence of association with AD was observed for this GAB2 marker (p>0.17). To evaluate GAB2-APOE gene-gene interactions, we stratified our series according to APOE genotype and case-control status, in accordance with the original studies. Again, no evidence of genetic association with AD was observed in any strata of GAB2-APOE loci pair (p>0.34).

Conclusion

GAB2 rs2373115 marker does not modify the risk of Alzheimer’s disease in Spanish APOE ε4 carriers.

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Authors and Affiliations

  1. Department of Structural Genomics, NeoCodex, Sevilla, Spain

    Reposo Ramírez-Lorca, M. E. Saez, M. Gutierrez, L. M. Real, J. Gayan, A. Gonzalez-Perez & A. Ruiz

  2. ACE Foundation, Catalan Institute of Applied Neurosciences, Catalan, Spain

    M. Boada, I. Hernandez, A. Mauleon, M. Rosende-Roca, P. Martinez-Lage & L. Tarraga

  3. Neurology Service, University General Hospital Vall d’Hebron, Barcelona, Spain

    M. Boada

  4. Memory Unit, University Hospital La Paz- Cantoblanco, Madrid, Spain

    J. Lopez-Arrieta

  5. Dementia Unit, University Hospital Virgen de la Arrixaca, Murcia, Spain

    C. Antunez

  6. Alzheimur Foundation, Murcia, Spain

    C. Antunez

  7. Neocodex, Avda Charles Darwin, n6, Acc A, Spain

    Reposo Ramírez-Lorca

  8. Isla de la Cartuja, 41092, Sevilla, Spain

    Reposo Ramírez-Lorca

Authors
  1. Reposo Ramírez-Lorca
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  2. M. Boada
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  3. M. E. Saez
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  4. I. Hernandez
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  5. A. Mauleon
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  6. M. Rosende-Roca
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  7. P. Martinez-Lage
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  8. M. Gutierrez
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  9. L. M. Real
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  10. J. Lopez-Arrieta
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  11. J. Gayan
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  12. C. Antunez
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  13. A. Gonzalez-Perez
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  14. L. Tarraga
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  15. A. Ruiz
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Corresponding author

Correspondence to Reposo Ramírez-Lorca.

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Ramírez-Lorca, R., Boada, M., Saez, M.E. et al. GAB2 gene does not modify the risk of Alzheimer’s disease in Spanish APOE 4 carriers. J Nutr Health Aging 13, 214–219 (2009). https://doi.org/10.1007/s12603-009-0061-6

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  • DOI: https://doi.org/10.1007/s12603-009-0061-6

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