Mutations

PSEN1 A137T

Overview

Pathogenicity: Frontotemporal Dementia : Not Classified
Clinical Phenotype: Frontotemporal Dementia
Reference Assembly: GRCh37/hg19
Position: Chr14:73640344 G>A
dbSNP ID: NA
Coding/Non-Coding: Coding
Mutation Type: Point, Missense
Codon Change: GCC to ACC
Reference Isoform: PSEN1 Isoform 1 (467 aa)
Genomic Region: Exon 5

Findings

This mutation was found in a U.K. genetic screen of more than 3,000 samples of patients with dementia (Koriath et al., 2018). The mutation carrier was a woman diagnosed with frontotemporal dementia with a known negative family history of the disease. Her age at onset was 47. The mutation was absent from genetic variant databases, including ExAC and gnomAD.

Neuropathology
Unknown

Biological Effect
The biological effect of this mutation is unknown. Several pathogenic mutations have been reported nearby. In silico algorithms to predict the effects of this variant on protein function (SIFT, Polyphen-2, LRT, MutationTaster, MutationAssessor, FATHMM, PROVEAN, CADD, REVEL, and Reve in the VarCards database) yielded conflicting results (Xiao et al., 2021).

Based on their proposed pathogenicity algorithm, Koriath and colleagues classified the mutation as likely deleterious.

Last Updated: 13 Sep 2021

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References

Paper Citations

  1. . Predictors for a dementia gene mutation based on gene-panel next-generation sequencing of a large dementia referral series. Mol Psychiatry. 2018 Oct 2; PubMed.
  2. . APP, PSEN1, and PSEN2 Variants in Alzheimer's Disease: Systematic Re-evaluation According to ACMG Guidelines. Front Aging Neurosci. 2021;13:695808. Epub 2021 Jun 18 PubMed.

Further Reading

No Available Further Reading

Protein Diagram

Primary Papers

  1. . Predictors for a dementia gene mutation based on gene-panel next-generation sequencing of a large dementia referral series. Mol Psychiatry. 2018 Oct 2; PubMed.

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