Mutations

PSEN1 I437V

Overview

Pathogenicity: Alzheimer's Disease : Pathogenic
Clinical Phenotype: Alzheimer's Disease
Reference Assembly: GRCh37 (105)
Position: Chr14:73685902 A>G
dbSNP ID: NA
Coding/Non-Coding: Coding
Mutation Type: Point, Missense
Codon Change: ATC to GTC
Reference Isoform: PSEN1 isoform 1 (467 aa)
Genomic Region: Exon 12

Findings

This mutation was identified by whole exome sequencing in a Frenchwoman diagnosed with Alzheimer’s disease according to NINDCS-ADRDA criteria (Nicolas et al., 2015). She was 57 years old when symptoms first appeared. Her clinical presentation was consistent with typical AD. Her APOE genotype was E3/E4. She had no family history of AD.

Neuropathology

Unknown.

Biological Effect

An in vitro assay using purified proteins to test the ability of this mutant to cleave the APP-C99 substrate revealed reduced production of Aβ40 and Aβ42 compared with wildtype PSEN1, and an Aβ42/Aβ40 ratio that was elevated more than fivefold (Sun et al., 2017).

Last Updated: 23 Nov 2019

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References

Paper Citations

  1. . Screening of dementia genes by whole-exome sequencing in early-onset Alzheimer disease: input and lessons. Eur J Hum Genet. 2015 Aug 5; PubMed.
  2. . Analysis of 138 pathogenic mutations in presenilin-1 on the in vitro production of Aβ42 and Aβ40 peptides by γ-secretase. Proc Natl Acad Sci U S A. 2017 Jan 24;114(4):E476-E485. Epub 2016 Dec 5 PubMed.

Further Reading

No Available Further Reading

Protein Diagram

Primary Papers

  1. . Screening of dementia genes by whole-exome sequencing in early-onset Alzheimer disease: input and lessons. Eur J Hum Genet. 2015 Aug 5; PubMed.

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