Backgrounnd: The impact of Alzheimer's disease (AD) on the living quality and life expectancy has becoming increasingly severe, but the pathogenesis of AD is still being studied .This study aimed to investigate whether Family with sequence similarity 3 member C (FAM3C), which has been reported to be possibly associated with cognitive function, was associated with the incidence of AD.Methods: A total of 282 participants from Alzheimer’s Disease Neuroimaging Initiative (ADNI) were included. The demographic data, cerebrospinal fluid (CSF) FAM3C content, neuropsychological scores, CSF amyloid protein level, CSF tau protein level, and imaged data were collected. One-way analysis of variance and chi-square test were used to compare demographic data, neuropsychological test scores, CSF protein levels, and imaging data of three groups. Partial correlation analysis and multiple linear regression analysis were used to investigate the relationship between FAM3C and AD diagnostic indicators in different dimensions. An ordered multi-classification logistic regression model was established to determine whether FAM3C is related to the onset of AD. Results: Lower levels of FAM3C were observed in AD and mild cognitive impairment (MCI) groups. CSF FAM3C level was related to whole-brain atrophy and temporal lobe atrophy, worse cognitive performance, decreased amyloid β 1-42 (Aβ1-42), and lower regional cerebral glucose metabolism. Conclusion: CSF FAM3C might be a potential diagnostic biomarker of AD. Further study on concrete mechanisms may contribute to early diagnosis and treatment of AD.
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