数据日期 2026-10-29 · 生成时间 2026-10-29 06:03
研究问题
Dementia with Lewy bodies (DLB) is a progressive neurodegenerative disorder characterized by dementia accompanied by cognitive fluctuations, recurrent visual hallucinations, rapid eye movement sleep behavior disorder, and spontaneous parkinsonism [1].
方法
A total of 42 samples were included: 9 neurologically unaffected controls, 9 individuals with AD, 12 with DLB, and 12 with PDD.；No new biological samples were generated or experimentally processed, and no chemicals, reagents, laboratory instruments, commercial cell lines, or newly acquired biological materials were directly used in the present secondary analysi.；Source-level preprocessing included robust multi-array average (RMA) background correction, quantile normalization, log2 transformation, and median-polish summarization.；PCA was performed on the resulting centered sample-by-gene expression matrix, and the first two principal components were examined to assess global sample structure, diagnostic-group overlap, and potential outlying samples.
核心结论
The first principal component accounted for 26.86% of the total expression variance, whereas the second principal component accounted for 7.71%.；SLC19A2 exhibited a log2 fold change of −0.670 (95% CI, −0.912 to −0.427; p = 1.76 × 10−6; FDR = 0.02064), VAMP1 a log2 fold change of −1.299 (95% CI, −1.771 to −0.828; p = 1.83 × 10−6; FDR = 0.02064), and COX5B a log2 fold change of −0.869 (95% CI, −1.191 to −0.547; p = 2.59 × 10−6; FDR = 0.02064).；Among these genes, SLC19A2 additionally showed nominal evidence of lower expression in DLB than in AD (log2FC = −0.341, p = 0.01506), although the association did not remain significant after transcriptome-wide multiple-testing correction (FDR = 0.7674). ‖ 结论：The present study identified a limited set of candidate molecular differences among DLB, AD, and PDD rather than a robust transcriptome-wide disease-discriminatory signature.
局限
The observed VAMP1 expression pattern may therefore be compatible with altered synaptic or vesicular processes in DLB, although bulk-tissue data cannot establish whether this reflects regulation within surviving neurons or differences in cellular composition.；Genetic studies have likewise demonstrated heterogeneity within Lewy body disease, including genetic effects associated with dementia status, sex-specific X-chromosomal signals, and population-specific risk loci [23,24,25].；Future studies should determine whether the observed candidate-level differences reflect reproducible disease-related molecular alterations, cell-type-specific effects, or differences in tissue composition and…
对本项目的价值
★★☆☆☆ 脑老化是最大未满足需求，也是终点最难量化的领域；biomarker 与认知读数选择最敏感。最大样本量约 12；设计 孟德尔随机化、Meta 分析。
全文来源
PMC JATS 全文（正文 57,471 字符，已过标题/DOI 逐字归属校验）
原文题录
- 英文标题：Integrative Genetic and Transcriptomic Analysis Reveals Candidate Molecular Differences Among Dementia with Lewy Bodies, Alzheimer's Disease, and Parkinson's Disease Dementia.
- 期刊与标识：Int J Mol Sci · PMID 42941947 · DOI 10.3390/ijms27209173**
B 级证据分级：B 级（同行评议临床前研究，主要为动物模型）
本文核心结论来自动物模型或体外细胞学，属临床前证据，不能外推至人体。「延长健康寿命」「改善功能」等表述在小鼠中的意义，与人类临床结局之间仍有距离。
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