Abstract
Basal forebrain cholinergic neuron (BFCN) degeneration is a hallmark of Down syndrome (DS) and Alzheimer’s disease (AD). Current therapeutics have been unsuccessful in slowing disease progression, likely due to complex pathological interactions and dysregulated pathways that are poorly understood. The Ts65Dn trisomic mouse model recapitulates both cognitive and morphological deficits of DS and AD, including BFCN degeneration. We utilized Ts65Dn mice to understand mechanisms underlying BFCN degeneration to identify novel targets for therapeutic intervention. We performed high-throughput, single population RNA sequencing (RNA-seq) to interrogate transcriptomic changes within medial septal nucleus (MSN) BFCNs, using laser capture microdissection to individually isolate ~500 choline acetyltransferase-immunopositive neurons in Ts65Dn and normal disomic (2N) mice at 6 months of age (MO). Ts65Dn mice had unique MSN BFCN transcriptomic profiles at ~6 MO clearly differentiating them from 2N mice. Leveraging Ingenuity Pathway Analysis and KEGG analysis, we linked differentially expressed gene (DEG) changes within MSN BFCNs to several canonical pathways and aberrant physiological functions. The dysregulated transcriptomic profile of trisomic BFCNs provides key information underscoring selective vulnerability within the septohippocampal circuit. We propose both expected and novel therapeutic targets for DS and AD, including specific DEGs within cholinergic, glutamatergic, GABAergic, and neurotrophin pathways, as well as select targets for repairing oxidative phosphorylation status in neurons. We demonstrate and validate this interrogative quantitative bioinformatic analysis of a key dysregulated neuronal population linking single population transcript changes to an established pathological hallmark associated with cognitive decline for therapeutic development in human DS and AD.
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Data Availability
Data analyzed within this study are included in this body of the manuscript and within the supplementary information files. Data are also available from the corresponding author upon request.
Change history
27 November 2021
A Correction to this paper has been published: https://doi.org/10.1007/s12035-021-02647-9
Abbreviations
- Adcy1 :
-
adenylate cyclase 1
- AD:
-
Alzheimer’s disease
- Apoe :
-
apolipoprotein E
- Atp5a1 :
-
ATP synthase H+ transporting mitochondrial F1 complex, alpha subunit 1
- Atp5o :
-
ATP synthase H+ transporting mitochondrial F1 complex, O subunit
- BFCN:
-
basal forebrain cholinergic neuron
- Bop1 :
-
block of proliferation 1 ribosomal biogenesis factor
- Bdnf :
-
brain derived neurotrophin factor
- Bysl :
-
bystin like
- Camk2a :
-
calcium/calmodulin dependent protein kinase II alpha
- Calm3 :
-
calmodulin 3
- Capn1 :
-
calpain 1
- ChAT:
-
choline acetyltransferase
- CPM:
-
counts per million
- Cox4i1 :
-
cytochrome c oxidase subunit 4I1
- Ddx5 :
-
DEAD-box helicase 5
- DEG:
-
differentially expressed gene
- Dlg4; also known as PSD-95 :
-
discs large MAGUK scaffold protein 4
- 2N:
-
disomic
- DS:
-
Down syndrome
- Dyrk1a :
-
dual specificity tyrosine phosphorylation regulated kinase 1A
- Ets2 :
-
E26 avian leukemia oncogene 2,3’ domain
- Eif5b :
-
eukaryotic translation initiation factor 5B
- FDR:
-
false discovery rate
- FAK:
-
focal adhesion kinase
- Gnb5 :
-
G protein subunit beta5
- Gusb :
-
glucuronidase beta
- Grin2a :
-
glutamate ionotropic receptor NDMA type subunit 2A
- Gria1 :
-
glutamate receptor, ionotropic, AMPA1
- Gapdh :
-
glyceraldehyde-3-phosphate dehydrogenase
- HSA21:
-
human chromosome 21
- IPA:
-
Ingenuity Pathway Analysis
- Jam2 :
-
junction adhesion molecule 2
- Kidins220/Arms :
-
kinase D interacting substrate 220
- KEGG:
-
Kyoto Encyclopedia of Genes and Genomes
- LCM:
-
laser capture microdissection
- Lca5l :
-
lebercilin congenital amaurosis 5-like
- LFC:
-
log-fold change
- LTD:
-
long-term depression
- LTP:
-
long-term potentiation
- MSN:
-
medial septal nucleus
- miRNAs:
-
microRNAs
- Mapk8 aka Erk2 :
-
mitogen-activated protein kinase 8
- Mapk3 :
-
mitogen-activated protein kinase 3
- MO:
-
months of age
- Chrm1 :
-
muscarinic cholinergic receptor 1
- Chrm2 :
-
muscarinic cholinergic receptor 2
- N6amt1 :
-
N-6 adenine-specific DNA mythltransferase1
- Mt-Nd1, Mt-Nd2, Mt-Nd 4, and Mt-Nd5 :
-
NADH dehydrogenases
- Ndufa6, Ndufab1, Ndufb2, Ndufb4, Ndufs1, Ndufs2, Ndufs4, Ndusf7, and Ndufs8 :
-
NADH:ubiquinone oxidoreductase subunits
- Mme :
-
neprilysin
- Ngfr/p75NTR :
-
nerve growth factor receptor
- Nos1 :
-
nitric oxide synthase 1
- ncRNA:
-
noncoding RNA
- Pik3ca :
-
phosphatidylinositol 3- kinase catalytic subunit
- Plcb1 :
-
phospholipase C beta 1
- Plcb2 :
-
phospholipase C beta 2
- PEN:
-
polyethylene naphthalate
- PCA:
-
principal component analysis
- Pa2g4 :
-
proliferation-associated 2G4
- Prkcg :
-
protein kinase C gamma
- QC:
-
quality control
- RNA-seq:
-
RNA sequencing
- RT:
-
room temperature
- Setd4 :
-
SET domain containing 4
- Son :
-
Son DNA binding protein
- Stx1a :
-
syntaxin 1A
- Tiam1 :
-
T cell lymphoma invasion and metastasis 1
- Ttc3 :
-
tetratricopeptide repeat domain 3
- TEG:
-
transcript expression
- Ntrk1 :
-
TrkA
- Ts:
-
Ts65Dn
- Rela:
-
v-rel reticuloendotheliosis viral oncogene homolog A
- WGCNA:
-
weighted gene co-expression network analysis
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Acknowledgments
We thank Arthur Saltzman, M.S. and Paul Zappile, M.S. for expert technical assistance.
Funding
Funding was provided by support from grants AG014449, AG043375, AG055328, and AG017617 from the National Institutes of Health and the Alzheimer’s Association.
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Contributions
MJA, SCP, AH, PR, and SDG designed the experiments. MJA and SCP performed the experiments. MJA, SCP, PR, and SDG performed the statistical analysis. MJA and SDG wrote manuscript. All authors read and approved final manuscript.
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Animal protocols were approved by the Nathan Kline Institute/NYU Grossman School of Medicine Animal Care and Use Committee (IACUC) in accordance with NIH guidelines.
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The authors declare that they have no competing interests.
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Supplementary information
Supplemental Figure 1
Covariate analysis utilizing voom. A Bar graph represents weight of each sample for RNA input covariate. B voom mean variance plot represents individual gene spread along the log2 path prior to RNA input covariate analysis. C voom mean variance plot represents individual gene spread along the log2 path after normalizing for RNA input covariate. (PNG 6130 kb)
Supplemental Figure 2
Comparison of DEGs and TEGs. A Overlap of genes identified at (p < 0.05) for gene and transcript analysis. B Listing of TEG -log(p value) and z-scores for pathways identified by DEG IPA analysis as most relevant. C-E Individual pathways with common genes from DEG and TEG highlighted in Blue (pink fill 2N > Ts, green fill Ts > 2N). Red outlines indicate genes that are only significant in DEG (gray fill). Purple outlines indicate genes that are only significant in TEG. C Glutamate receptor pathway, D CREB Signaling Pathway, E Synaptic Long-Term Potentiation F Oxidative Phosphorylation. (PNG 9274 kb)
Supplemental Figure 3
STRING protein network plots using Cytoscape. A STRING Cytoscape of entire gene list for Blue module using confidence score cutoff of 0.8, of which 1721 proteins were identified from the Blue module gene list of 2124 genes, forming 2999 interactions. B-E Highlighted in the insets of B-E are close groupings of protein-protein interactions with high confidence. (PNG 17145 kb)
Supplemental Table 1
Key Resources (XLSX 11 kb)
Supplemental Table 2
Metadata for RNA-seq library preparation samples including LCM, RNA QA/QC, RNA-seq library preparation, and sequencing. (XLSX 19 kb)
Supplemental Table 3
Gene expression changes (p < 0.05) comparing Ts MSN BFCNs to 2N littermates are identified by LFC, p value (p < 0.05) and FDR. (XLSX 177 kb)
Supplemental Table 4
Comparison of top 20 pathways identified by DEG IPA analysis and TEG utilizing (p < 0.05) criteria. While TEG IPA -log(p values) were often higher, the z-scores were lower, indicating discrepancy in transcripts compared to gene levels in MSN BFCNs. (DOCX 24 kb)
Supplemental Table 5
IPA canonical pathways identified with all genes in the Blue module. (XLSX 21 kb)
Supplemental Table 6
IPA canonical pathways identified with all genes in the Black module. (XLSX 17 kb)
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Alldred, M.J., Penikalapati, S.C., Lee, S.H. et al. Profiling Basal Forebrain Cholinergic Neurons Reveals a Molecular Basis for Vulnerability Within the Ts65Dn Model of Down Syndrome and Alzheimer’s Disease. Mol Neurobiol 58, 5141–5162 (2021). https://doi.org/10.1007/s12035-021-02453-3
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DOI: https://doi.org/10.1007/s12035-021-02453-3