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Evolutionary History of Alzheimer Disease-Causing Protein Family Presenilins with Pathological Implications

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Abstract

Presenilin proteins make the catalytic component of γ-secretase, a multiprotein transmembrane protease, and are type II transmembrane proteins. Amyloid protein, Notch, and beta catenin are among more than 90 substrates of Presenilins. Mutations in Presenilins lead to defects in proteolytic cleavage of its substrate resulting in some of the most devastating pathological conditions including Alzheimer disease (AD), developmental disorders, and cancer. In addition to catalytic roles, Presenilin protein is also shown to be involved in many non-catalytic roles, i.e., calcium homeostasis, regulation of autophagy, and protein trafficking, etc. These proteolytic proteins are highly conserved and are present in almost all the major eukaryotic groups. Studies, performed on a wide variety of organisms ranging from human to unicellular dictyostelium, have shown the important catalytic and non-catalytic roles of Presenilins. In this study, we infer the evolutionary patterns and history of Presenilins as well as of other γ-secretase proteins. We show that Presenilins are the most ancient of the γ-secretase proteins and that Presenilins may have their origin in the last common ancestor (LCA) of Eukaryotes. We also demonstrate that Presenilin proteins generally lack diversifying selection during the course of their evolution. Through evolutionary trace analysis, we show that Presenilin protein sites that undergo mutations in Familial Alzheimer disease, are highly conserved in metazoans. Finally, we discuss the evolutionary, physiological, and pathological implications of our findings and propose that the evolutionary profile of Presenilins supports the loss of function hypothesis of AD pathogenesis.

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taken from the work of Zhang et al. (2013). c Bar graph showing the frequency of rank values/conservation score (with 1 being for the most conserved and 10 being the least conserved residue) with their corresponding rank values/conservation scores in the transmembrane and non-transmembrane portion of the Presenilin-1 protein. d List of site-directed mutations (taken from UniProt database) which have been carried out in the Presenilin-1 gene. Column-1 represents the position of residues; column-2 shows the heatmap, depicting conservation profile of mutated sites; column-3 represents substituted residues on the left side of the arrow and replacement residues on the right side of the arrow with more than one replacement residues giving rise to a specific phenotype are separated by a comma, and finally, the phenotypic effects due to these mutations are given in columns 4 where Φ-Loss of interaction with GFAP, Ω-abolished protease activity, Ψ-increased protease activity, ∆-abolished caspase cleavage, α-alters γ-secretase specificity, Π-abolished PKA signaling, and β-reduced notch processing (Color figure online)

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Acknowledgements

We are grateful to Professor Dr. Khalid J. Siddiqui for spending time in improving the grammar and other language-related aspects of our manuscript.

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Correspondence to Ammad Aslam Khan.

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Handling editor: Joana Projecto-Garcia.

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Khan, A.A., Ali, R.H. & Mirza, B. Evolutionary History of Alzheimer Disease-Causing Protein Family Presenilins with Pathological Implications. J Mol Evol 88, 674–688 (2020). https://doi.org/10.1007/s00239-020-09966-w

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  • DOI: https://doi.org/10.1007/s00239-020-09966-w

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