Mutations

PSEN1 N32N

Overview

Pathogenicity: Alzheimer's Disease : Unclear Pathogenicity
Clinical Phenotype: Alzheimer's Disease, None
Reference Assembly: GRCh37 (105)
Position: Chr14:73637513 T>C
dbSNP ID: NA
Coding/Non-Coding: Coding
Mutation Type: Point, Silent
Codon Change: AAT to AAC
Reference Isoform: PSEN1 isoform 1 (467 aa)
Genomic Region: Exon 4

Findings

This is a silent polymorphism, considered most likely not pathogenic. It was first reported in a Caucasian woman from northern Italy who was diagnosed with probable Alzheimer’s disease according to NINCDS-ADRDA criteria. She experienced symptom onset at age 81 and did not have a family history of dementia, consistent with sporadic AD. Segregation analysis was not possible in this case. The T>C polymorphism was absent in 114 healthy unrelated individuals, but the reporting authors indicated that the polymorphism was most likely not pathogenic due to the fact that it was a synonymous change and in a position not conserved in PSEN2 or in other species (Scacchi et al., 2007).

Consistent with this proposal, the variant was described as "most likely benign" or causing an "only small increase in risk" based on its allele count (12) and frequency (0.0043 percent) in the gnomAD variant database (Koriath et al., 2018). The penetrance was calculated to be two percent or less.

Neuropathology

Unknown.

Biological Effect

Unknown.

Last Updated: 16 Jul 2019

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References

Paper Citations

  1. Scacchi R, Gambina G, Moretto G, Corbo RM. A mutation screening by DHPLC of PSEN1 and APP genes reveals no significant variation associated with the sporadic late-onset form of Alzheimer's disease. Neurosci Lett. 2007 May 18;418(3):282-5. Epub 2007 Mar 21 PubMed.
  2. Koriath C, Kenny J, Adamson G, Druyeh R, Taylor W, Beck J, Quinn L, Mok TH, Dimitriadis A, Norsworthy P, Bass N, Carter J, Walker Z, Kipps C, Coulthard E, Polke JM, Bernal-Quiros M, Denning N, Thomas R, Raybould R, Williams J, Mummery CJ, Wild EJ, Houlden H, Tabrizi SJ, Rossor MN, Hummerich H, Warren JD, Rowe JB, Rohrer JD, Schott JM, Fox NC, Collinge J, Mead S. 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.

Further Reading

Learn More

  1. Alzheimer Disease & Frontotemporal Dementia Mutation Database

Protein Diagram

Primary Papers

  1. Scacchi R, Gambina G, Moretto G, Corbo RM. A mutation screening by DHPLC of PSEN1 and APP genes reveals no significant variation associated with the sporadic late-onset form of Alzheimer's disease. Neurosci Lett. 2007 May 18;418(3):282-5. Epub 2007 Mar 21 PubMed.

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