title: No association of CDK5 genetic variants with Alzheimer's disease risk.
abstract: BACKGROUND
  As cyclin-dependent kinase 5 (CDK5) has been implicated in the abnormal hyperphosphorylation of tau in Alzheimer's disease (AD) brain, and the development of neurofibrillary tangles, we examined the contribution of this gene to the susceptibility for AD.
  
  
  METHODS
  We examined genetic variations of CDK5 by genotyping haplotype tagging SNPs (htSNPs) (rs9278, rs2069459, rs891507, rs2069454, rs1549759 and rs2069442) in a group of 408 Spanish AD cases and 444 controls.
  
  
  RESULTS
  There were no differences in the genotypic, allelic or haplotypic distributions between cases and controls in the overall analysis or after stratification by APOE epsilon4 allele.
  
  
  CONCLUSIONS
  Our negative findings in the Spanish population argue against the hypothesis that CDK5 genetic variations are causally related to AD risk. Still, additional studies using different sets of patients and control subjects deserve further attention, since supporting evidence for association between CDK5 gene and AD risk in the Dutch population exists.
authors.affiliation: Neurology Service and Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas, University Hospital Marqués de Valdecilla (University of Cantabria), Santander, Spain. josevazquezhiguera@hotmail.com
authors.forename: José Luis
authors.initials: JL
authors.lastname: Vázquez-Higuera
authors.forename: Ignacio
authors.initials: I
authors.lastname: Mateo
authors.forename: Pascual
authors.initials: P
authors.lastname: Sánchez-Juan
authors.forename: Eloy
authors.initials: E
authors.lastname: Rodríguez-Rodríguez
authors.forename: Jon
authors.initials: J
authors.lastname: Infante
authors.forename: José
authors.initials: J
authors.lastname: Berciano
authors.forename: Onofre
authors.initials: O
authors.lastname: Combarros
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000483:Alleles; D000544:Alzheimer Disease / Q000235:genetics*; D016022:Case-Control Studies; D051360:Cyclin-Dependent Kinase 5 / Q000235:genetics*; D005260:Female; D005787:Gene Frequency; D020022:Genetic Predisposition to Disease; D006239:Haplotypes; D006801:Humans; D008297:Male; D008875:Middle Aged; D020641:Polymorphism, Single Nucleotide; D012307:Risk Factors; D013030:Spain
chemical_list: D051360:Cyclin-Dependent Kinase 5; C495905:CDK5 protein, human