CSF Potential Biomarkers Aβ42 and Tau: associations of Apo E Genotype

  • Ramesh Kandimalla
  • KD Gill
  • SK Prabhakar
Open Access
Meeting abstract
  • 748 Downloads

Keywords

MMSE Score Allele Distribution Frequency Presymptomatic Stage Neurological Control Nehru Hospital 

Background

The most promising strategy to detect AD in preclinical or presymptomatic stage need specific biomarkers. In this study we elucidated the relationship between Apo E genotype and CSF biomarkers Aβ42 and Total tau in Alzheimer's Disease (AD) Patients, Non AD (NAD) patients, Neurological controls (NCs) and Healthy Controls (HCs).

Materials and methods

In this study we included 30 HC, 30 AD patients, 40 NAD, and 46 NC from Nehru Hospital, PGIMER, Chandigarh, India after obtaining informed consent from all the subjects. Apo E Genotyping was done according to the Wenham PR etal,1991. The levels of Aβ42 and total tau were determined by ELISA kits Innogenetics, Belgium.

Results

Our data of CSF Aβ42 and tau levels in conjunction with ε4 allele had shown specificity and sensitivity of 100% and 42.8% respectively for the detection of AD. Aβ42 and Apo E ε4 combination had shown specificity 80.8% and sensitivity 72.1 %. The ε4 allele distribution frequency was 40% and 2.5% in AD and NAD respectively, where as ε4/4 genotype and ε3/4 genotype distribution was 10 % and 50 % respectively. Our data has shown that ε4 allele in combination with Aβ42 to have better sensitivity and specificity in the diagnosis of AD. AD patients with at least one ε4 allele had significantly lower CSF Aβ42 levels than those without ε4 allele (P < 0.001). There was a positive correlation of Aβ42 with low MMSE scores.

Conclusions

Observation from our study suggest that decreased Aβ42 and increased tau level in CSF along with Apo E ε4 allele as risk factors for AD. Our study also shows ε4 allele incidence to be a risk factor for AD.

Notes

Acknowledgements

ICMR, New Delhi, India for funding this study and Senior Residents of department of neurology. Colleagues Nidhi, Deep raj and Aditya

References

  1. 1.
    Wenham PR, Price WH, Blandell G: Apolipoprotein E genotyping by one-stage PCR. Lancet. 1991, 337: 1158-9. 10.1016/0140-6736(91)92823-K.CrossRefPubMedGoogle Scholar
  2. 2.
    Tapiola T, Pirttila T, Mehta PD, Alafuzofff I, Lehtovirta M, Soininen H: Relationship between apoE genotype and CSF beta-amyloid (1-42) and tau in patients with probable and definite Alzheimer's disease. Neurobiol Aging. 2000, 2: 735-40. 10.1016/S0197-4580(00)00164-0.CrossRefGoogle Scholar
  3. 3.
    Riemenschneider M, Schmolke M, Lautenschlager N, Vanderstichele H, Vanmechelen E, Guder WG, et al: Association of CSF apolipoprotein E, Abeta42 and cognition in Alzheimer's disease. Neurobiol Aging. 2002, 23: 205-11. 10.1016/S0197-4580(01)00272-X.CrossRefPubMedGoogle Scholar
  4. 4.
    Petersen RC, Smith GE, Ivnik RJ, Tangalos EG, Schaid DJ, Thibodeau SN, et al: Apolipoprotein E status as a predictor of the development of Alzheimer's disease in memory-impaired individuals. JAMA. 1995, 273: 1274-8. 10.1001/jama.273.16.1274.CrossRefPubMedGoogle Scholar

Copyright information

© Kandimalla et al; licensee BioMed Central Ltd. 2009

This article is published under license to BioMed Central Ltd.

Authors and Affiliations

  • Ramesh Kandimalla
    • 1
  • KD Gill
    • 1
  • SK Prabhakar
    • 2
  1. 1.Department of BiochemistryPGIMERChandigarhIndia
  2. 2.Department of NeurologyPGIMERChandigarhIndia

Personalised recommendations