Neurofilament light chain (NfL) is a promising fluid biomarker of disease progression for various cerebral proteopathies. Here we leverage the unique characteristics of the Dominantly Inherited Alzheimer Network and ultrasensitive immunoassay technology to demonstrate that NfL levels in the cerebrospinal fluid (n = 187) and serum (n = 405) are correlated with one another and are elevated at the presymptomatic stages of familial Alzheimer’s disease. Longitudinal, within-person analysis of serum NfL dynamics (n = 196) confirmed this elevation and further revealed that the rate of change of serum NfL could discriminate mutation carriers from non-mutation carriers almost a decade earlier than cross-sectional absolute NfL levels (that is, 16.2 versus 6.8 years before the estimated symptom onset). Serum NfL rate of change peaked in participants converting from the presymptomatic to the symptomatic stage and was associated with cortical thinning assessed by magnetic resonance imaging, but less so with amyloid-β deposition or glucose metabolism (assessed by positron emission tomography). Serum NfL was predictive for both the rate of cortical thinning and cognitive changes assessed by the Mini–Mental State Examination and Logical Memory test. Thus, NfL dynamics in serum predict disease progression and brain neurodegeneration at the early presymptomatic stages of familial Alzheimer’s disease, which supports its potential utility as a clinically useful biomarker.
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Data that support the findings of this study are available from DIAN at https://dian.wustl.edu/our-research/observational-study/dian-observational-study-investigator-resources/.
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We would like to thank M. Staufenbiel and M. Eichner for support and helpful comments and C. Haass and M. Suarez (Munich) for experimental and logistic support. Data collection and sharing for this project was supported by DIAN (grant no. UF1AG032438) funded by the National Institute on Aging and the German Center for Neurodegenerative Diseases (DZNE). Additional support came from the National Institutes of Health-funded NINDS Center Core for Brain Imaging (grant no. P30NS098577), the National Science Foundation (grant no. DGE-1745038), National Institutes of Health (grant no. UL1TR001873 to J.M.N.), the Swiss National Science Foundation (grant no. 320030-160221 to J.K.), the National Institute for Health Research University College London Hospitals Biomedical Research Centre, and the MRC Dementias Platform UK (grant nos. MR/L023784/1 and MR/009076/1). We acknowledge the altruism of the participants and their families and input of the DIAN research and support staff at each of the participating sites for their contributions to this study.
A.M.G. has consulted for Cognition Therapeutics, Biogen, GlaxoSmithKline, Illumina, Eisai, AbbVie, and Pfizer and served on the Scientific Advisory Board for Denali Therapeutics. A.M.F. is a member of the Scientific Advisory Boards for AbbVie, Genentech and Roche Diagnostics and provides consultation for Araclon/Grifols and DiamiR.
Publisher’s note: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Extended Data Fig. 1 Difference distribution curve for baseline (cross-sectional) CSF and serum NfL levels in mutation carriers and non-carriers.
a,b, Difference of posterior distribution for baseline CSF NfL (n = 187) (a) and baseline serum NfL (n = 405) (b) as a function of EYO. The solid red lines depict the median of the difference distribution; the shaded area represents the 99% equal-tailed credible intervals. EYO was considered statistically significant if the 99% equal-tailed credible intervals of the posterior distribution did not overlap 0 (6.8 years before EYO for both baseline CSF and serum NfL). For the absolute values of baseline CSF and serum NfL, see Fig. 1a,b.
Extended Data Fig. 2 No difference in baseline CSF and serum NfL levels among APP, PSEN1, and PSEN2 mutation carriers.
a, Two-tailed pairwise Student’s t-test comparisons of CSF NfL levels of carriers of a mutation in APP (n = 14), PSEN1 (n = 82), or PSEN2 (n = 11). b, Same analysis, using a two-tailed pairwise Student’s t-test for the serum NfL of carriers of a mutation in APP (n = 39), PSEN1 (n = 185), or PSEN2 (n = 19). No differences in log(CSF NfL) or log(serum NfL) were found between the groups (F(2, 104) = 1.8108, P = 0.1686 and F(2, 240) = 1.9205, P = 0.1488, respectively). Similarly, no differences were found by two-tailed pairwise Student’s t-test when age and disease status (presymptomatic, symptomatic) were treated as covariates. The boxes map to the median, 25th and 75th quintiles, and the whiskers extend to the 1.5 × IQR.
a, Spaghetti plot showing longitudinal serum NfL for non-carriers (NC, n = 63, blue) and mutation carriers (MC, n = 133, red) as a function of EYO. These are the same data as in Fig. 2a but with a logarithmic scale on the y axis to better appreciate the changes during the presymptomatic stage (for details, see Fig. 2a). b, Difference of posterior distribution for serum NfL rate of change between mutation carriers and non-carriers, as a function of EYO (n = 196). The solid red line depicts the median of the difference distribution, and the shaded area represents the 99% equal-tailed credible intervals. EYO was considered statistically significant if the 99% equal-tailed credible intervals of the posterior distribution did not overlap 0 (16.2 years before EYO). c, Individual estimated rate of change in serum NfL (same data as in Fig. 2b, n = 63 for non-carriers and n = 133 for mutation carriers). A regression analysis was performed with two breaks of slope (see Methods for calculation). With this model the first bifurcation point was found at −18.6 years before EYO, the second at −5.8 years before EYO.
Extended Data Fig. 4 Rate of change per year of serum NfL is a better parameter to distinguish presymptomatic and symptomatic mutation carriers from non-carriers compared to single cross-sectional serum NfL.
Receiver operating characteristic analysis for non-carriers (NC) versus presymptomatic mutation carriers (MC) and non-carriers versus symptomatic mutation carriers with cross-sectional (baseline serum NfL) and longitudinal (serum NfL rate of change per year) data. The true positive fraction (sensitivity) is on the y axis and the false positive fraction (1-specificity) on the x axis. The area under the curve (AUC, accuracy), as well as the cutoff value and χ2 P value from the logistic regression are shown. The chance level of the area under the curve is 0.50. Converters (for rate of change, see Fig. 2c) were considered presymptomatic mutation carriers.
Extended Data Fig. 5 No difference in serum NfL rate of change among APP, PSEN1, and PSEN2 mutation carriers and no association with estimated age of onset.
a, Using two-tailed pairwise Student’s t-tests, no differences in the rate of change of log(serum NfL) (year−1) levels among APP (n = 24), PSEN1 (n = 104), and PSEN2 (n = 5) mutation carriers (F(2, 130) = 0.4678, P = 0.6274) was found. Similarly, no differences were found when age and disease status (presymptomatic, symptomatic) were treated as covariates in a two-tailed pairwise Student’s t-test. b, No difference between an individual’s deviation from the EYO-adjusted median rate of change in NfL and their expected age of symptom onset using LMEMs. Individuals were grouped in 4 categories with expected symptom onset at 20–39 (n = 17), 40–49 (n = 54), 50–59 (n = 56), and over 60 years of age (n = 6); group comparisons, P > 0.146. See Methods for the calculations. The boxes map to the median, 25th and 75th quintiles, and the whiskers extend to the 1.5 × IQR.
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Preische, O., Schultz, S.A., Apel, A. et al. Serum neurofilament dynamics predicts neurodegeneration and clinical progression in presymptomatic Alzheimer’s disease. Nat Med 25, 277–283 (2019). https://doi.org/10.1038/s41591-018-0304-3
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