title: Deciphering the molecular profile of plaques, memory decline and neuron loss in two mouse models for Alzheimer's disease by deep sequencing.
abstract: One of the central research questions on the etiology of Alzheimer's disease (AD) is the elucidation of the molecular signatures triggered by the amyloid cascade of pathological events. Next-generation sequencing allows the identification of genes involved in disease processes in an unbiased manner. We have combined this technique with the analysis of two AD mouse models: (1) The 5XFAD model develops early plaque formation, intraneuronal Aβ aggregation, neuron loss, and behavioral deficits. (2) The Tg4-42 model expresses N-truncated Aβ4-42 and develops neuron loss and behavioral deficits albeit without plaque formation. Our results show that learning and memory deficits in the Morris water maze and fear conditioning tasks in Tg4-42 mice at 12 months of age are similar to the deficits in 5XFAD animals. This suggested that comparative gene expression analysis between the models would allow the dissection of plaque-related and -unrelated disease relevant factors. Using deep sequencing differentially expressed genes (DEGs) were identified and subsequently verified by quantitative PCR. Nineteen DEGs were identified in pre-symptomatic young 5XFAD mice, and none in young Tg4-42 mice. In the aged cohort, 131 DEGs were found in 5XFAD and 56 DEGs in Tg4-42 mice. Many of the DEGs specific to the 5XFAD model belong to neuroinflammatory processes typically associated with plaques. Interestingly, 36 DEGs were identified in both mouse models indicating common disease pathways associated with behavioral deficits and neuron loss.
authors.affiliation: Division of Molecular Psychiatry, Georg-August-University Goettingen, University Medicine Goettingen , Goettingen , Germany.
authors.forename: Yvonne
authors.initials: Y
authors.lastname: Bouter
authors.affiliation: Department of Bioinformatics, Institute of Biometrics and Medical Informatics, University Medicine Greifswald , Greifswald , Germany ; Department of Functional Genomics, Interfaculty Institute for Genetics and Functional Genomics, University Medicine Greifswald , Greifswald , Germany.
authors.forename: Tim
authors.initials: T
authors.lastname: Kacprowski
authors.affiliation: Human Molecular Genetics, Department for Human Genetics of the Institute for Genetics and Functional Genomics, Institute for Human Genetics, University Medicine Greifswald, Ernst-Moritz-Arndt University Greifswald , Greifswald , Germany.
authors.forename: Robert
authors.initials: R
authors.lastname: Weissmann
authors.affiliation: Division of Molecular Psychiatry, Georg-August-University Goettingen, University Medicine Goettingen , Goettingen , Germany.
authors.forename: Katharina
authors.initials: K
authors.lastname: Dietrich
authors.affiliation: Division of Molecular Psychiatry, Georg-August-University Goettingen, University Medicine Goettingen , Goettingen , Germany.
authors.forename: Henning
authors.initials: H
authors.lastname: Borgers
authors.affiliation: Division of Molecular Psychiatry, Georg-August-University Goettingen, University Medicine Goettingen , Goettingen , Germany.
authors.forename: Andreas
authors.initials: A
authors.lastname: Brauß
authors.affiliation: Human Molecular Genetics, Department for Human Genetics of the Institute for Genetics and Functional Genomics, Institute for Human Genetics, University Medicine Greifswald, Ernst-Moritz-Arndt University Greifswald , Greifswald , Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Sperling
authors.affiliation: Division of Molecular Psychiatry, Georg-August-University Goettingen, University Medicine Goettingen , Goettingen , Germany.
authors.forename: Oliver
authors.initials: O
authors.lastname: Wirths
authors.affiliation: Department of Bioinformatics, Institute of Biometrics and Medical Informatics, University Medicine Greifswald , Greifswald , Germany ; Institute for Knowledge Discovery, Graz University of Technology , Graz , Austria.
authors.forename: Mario
authors.initials: M
authors.lastname: Albrecht
authors.affiliation: Human Molecular Genetics, Department for Human Genetics of the Institute for Genetics and Functional Genomics, Institute for Human Genetics, University Medicine Greifswald, Ernst-Moritz-Arndt University Greifswald , Greifswald , Germany.
authors.forename: Lars R
authors.initials: LR
authors.lastname: Jensen
authors.affiliation: Human Molecular Genetics, Department for Human Genetics of the Institute for Genetics and Functional Genomics, Institute for Human Genetics, University Medicine Greifswald, Ernst-Moritz-Arndt University Greifswald , Greifswald , Germany.
authors.forename: Andreas W
authors.initials: AW
authors.lastname: Kuss
authors.affiliation: Division of Molecular Psychiatry, Georg-August-University Goettingen, University Medicine Goettingen , Goettingen , Germany.
authors.forename: Thomas A
authors.initials: TA
authors.lastname: Bayer
keywords: 5xFAD; Morris water maze; N-truncated abeta; Tg4–42; deep sequencing; fear conditioning; spatial reference memory; transcriptome