Overview

Pathogenicity: Alzheimer's Disease : Not Classified
ACMG/AMP Pathogenicity Criteria: PM2, PP3
Clinical Phenotype: Alzheimer's Disease
Position: (GRCh38/hg38):Chr21:26000162 G>A
Position: (GRCh37/hg19):Chr21:27372477 G>A
dbSNP ID: rs751737009
Coding/Non-Coding: Coding
DNA Change: Substitution
Expected RNA Consequence: Substitution
Expected Protein Consequence: Missense
Codon Change: GAG to AAG
Reference Isoform: APP Isoform APP770 (770 aa)
Genomic Region: Exon 7

Findings

This APP variant was identified in one of 424 French people with early onset AD by whole-exome sequencing (Nicolas et al., 2015). Because it is located in exon 7, the E296K variant is considered unlikely to be pathogenic.

Two alleles of this variant are reported in the gnomAD variant database, both from individuals of South Asian ancestry (gnomAD v2.1.1, Oct 2021).

Neuropathology

Unknown.

Biological Effects

The biological effects of this variant are unknown, but the PHRED-scaled CADD score, which integrates diverse information in silico, was above 20, suggesting a deleterious effect (CADD v.1.6, Oct 2021). 

Pathogenicity

Alzheimer's Disease : Not Classified*

*This variant fulfilled some ACMG-AMP criteria, but it was not classified by Alzforum, because data for either a pathogenic or benign classification are lacking: only one affected carrier has been reported without co-segregation data, and the variant is absent—or very rare—in the gnomAD database.

This variant fulfilled the following criteria based on the ACMG/AMP guidelines. See a full list of the criteria in the Methods page.

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References

Paper Citations

1. Nicolas G, Wallon D, Charbonnier C, Quenez O, Rousseau S, Richard AC, Rovelet-Lecrux A, Coutant S, Le Guennec K, Bacq D, Garnier JG, Olaso R, Boland A, Meyer V, Deleuze JF, Munter HM, Bourque G, Auld D, Montpetit A, Lathrop M, Guyant-Maréchal L, Martinaud O, Pariente J, Rollin-Sillaire A, Pasquier F, Le Ber I, Sarazin M, Croisile B, Boutoleau-Bretonnière C, Thomas-Antérion C, Paquet C, Sauvée M, Moreaud O, Gabelle A, Sellal F, Ceccaldi M, Chamard L, Blanc F, Frebourg T, Campion D, Hannequin D. Screening of dementia genes by whole-exome sequencing in early-onset Alzheimer disease: input and lessons. Eur J Hum Genet. 2015 Aug 5; PubMed.

External Citations

1. gnomAD v2.1.1
2. CADD v.1.6

Further Reading

No Available Further Reading