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GNG13 Is a Potential Marker of the State of Health of Alzheimer’s Disease Patients’ Cerebellum

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Abstract

Brain regions such as the cerebellum (CB) have been neglected for a long time in the study of Alzheimer’s disease (AD) pathogenesis. In reference to a new emerging hypothesis according to which there is an altered cerebellar synaptic processing in AD, we verified the possible role played by new biomarkers in the CB of AD patients compared with not-demented healthy control subjects (NDHS). Using a bioinformatics approach, we have collected several microarray datasets and obtained 626 cerebella sample biopsies belonging to subjects who did not die from causes related to neurological diseases and 199 cerebella belonging to AD. The analysis of logical relations between the transcriptome dataset highlighted guanine nucleotide–binding protein (G protein) gamma 13 (GNG13) as a potential new biomarker for Purkinje cells (PCs). We have correlated GNG13 expression levels with already widely existing bibliography of PC marker genes, such as Purkinje cell protein 2 (PCP2), Purkinje cell protein 4 (PCP4), and cerebellin 3 (CBLN3). We showed that expression levels of GNG13 and PCP2, PCP4, and CBLN3 were significantly correlated with each other in NDHS and in AD and significantly reduced in AD patients compared with NDHS subjects. In addition, we highlighted a negative correlation between the expression levels of PC biomarkers and age. From the outcome of our investigation, it is possible to conclude that the identification of GNG13 as a potentially biomarker in PCs represents also a state of health of CB, in association with the expression of PCP2, PCP4, and CBLN3.

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Abbreviations

AD:

Alzheimer’s disease

Aβ:

Amyloid beta

CNS:

Central nervous system

PFC:

Prefrontal cortex

TL:

The temporal lobes

PL:

Parietal lobe

PCP2:

Purkinje cell protein 2

PCP4:

Purkinje cell protein 4

CBLN3:

Cerebellin 3

GPCRs:

G protein–coupled receptors

NDHS:

Not-demented healthy control subjects

HPA:

Human Protein Atlas

G protein:

Guanine nucleotide binding protein

GNG13:

Gamma 13

SDEG:

Significant differentially expressed genes

MeV:

MultiExperiment Viewer

HIP:

Hippocampus

CB:

Cerebellum

PCs:

Purkinje cells

PCL:

Purkinje cell layer

LCMD:

Laser capture microdissection

EGFP:

Enhanced green fluorescent protein

APP:

Amyloid precursor protein

References

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Acknowledgments

We would like to show our gratitude to the authors of microarray datasets (Table 1) made available online, for consultation and re-analysis. We also want to thank the Sigur Rós band for realizing the song “hoppipolla,” an inspiration during the manuscript writing.

Funding

This work was supported by the University Research Project Grant (Triennial Research Plan 2020–2022), Department of Biomedical and Biotechnological Sciences (BIOMETEC), University of Catania, Italy.

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Authors and Affiliations

Authors

Contributions

Data curation, project administration, and software, M.D.; formal analysis, methodology, and writing of original draft, M.D. and C.S.; investigation, C.S.; resources, G.M. and V.M.; supervision, M.D. and G.M.; validation, P.C.; visualization, V.M. and M.K.; writing, reviewing, and editing, G.M. and R.I.

Corresponding author

Correspondence to Michelino Di Rosa.

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The authors declare that they have no competing interests.

Ethical Approval

This article does not contain any studies with human participants or animals performed by any of the authors.

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Electronic Supplementary Material

Figure S1

GNG13, PCP2, PCP4 and CBLN3 expression levels in cerebellar cortex and in cerebellum. Basal expression levels in healthy control subjects showed that GNG13, PCP2, PCP4 and CBLN3 expression levels were significantly higher in the cerebellar cortex than in the cerebellum. Data are expressed as z-score intensity expression levels and presented as violin dot plots. p values <0.05 were considered to be statistically significant (**p < 0.005; ****p < 0.00005). (PNG 732 kb)

High resolution image (TIF 995 kb)

Table s1

Anova results. (PDF 404 kb)

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Sanfilippo, C., Musumeci, G., Kazakova, M. et al. GNG13 Is a Potential Marker of the State of Health of Alzheimer’s Disease Patients’ Cerebellum. J Mol Neurosci 71, 1046–1060 (2021). https://doi.org/10.1007/s12031-020-01726-1

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  • DOI: https://doi.org/10.1007/s12031-020-01726-1

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