Mutations

MAPT N255N

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Overview

Pathogenicity: : Not Classified
Clinical Phenotype Studied: None
Position: (GRCh38/hg38):Chr17:45996607 T>C
Position: (GRCh37/hg19):Chr17:44073973 T>C
Transcript: NM_005910; ENST00000351559
dbSNP ID: rs17652121
Coding/Non-Coding: Coding
DNA Change: Substitution
Expected RNA Consequence: Substitution
Expected Protein Consequence: Silent
Codon Change: AAT to AAC
Reference Isoform: Tau Isoform Tau-F (441 aa)
Genomic Region: Exon 9

Findings

This synonymous variant in exon 9 is a common polymorphism and has not been associated with neurodegenerative disease. It was originally detected in 21 percent of the 22 controls screened (Poorkaj et al., 1998) and since has been found in multiple data sets of both healthy controls and affected individuals (e.g., Rizzu et al., 1999; Houlden et al., 1999; Guerreiro et al., 2010).

It is reported in the gnomAD variant database at a global frequency of 0.19 (gnomAD v.4.1.0, April 2024).

This variant's PHRED-scaled CADD score (5.87), which integrates diverse information in silico, was well below the commonly used threshold of 20 to predict deleteriousness (CADD v1.7, April 2024).

Last Updated: 13 Oct 2025

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References

Paper Citations

  1. Poorkaj P, Bird TD, Wijsman E, Nemens E, Garruto RM, Anderson L, Andreadis A, Wiederholt WC, Raskind M, Schellenberg GD. Tau is a candidate gene for chromosome 17 frontotemporal dementia. Ann Neurol. 1998 Jun;43(6):815-25. PubMed.
  2. Rizzu P, Van Swieten JC, Joosse M, Hasegawa M, Stevens M, Tibben A, Niermeijer MF, Hillebrand M, Ravid R, Oostra BA, Goedert M, van Duijn CM, Heutink P. High prevalence of mutations in the microtubule-associated protein tau in a population study of frontotemporal dementia in the Netherlands. Am J Hum Genet. 1999 Feb;64(2):414-21. PubMed.
  3. Houlden H, Baker M, Adamson J, Grover A, Waring S, Dickson D, Lynch T, Boeve B, Petersen RC, Pickering-Brown S, Owen F, Neary D, Craufurd D, Snowden J, Mann D, Hutton M. Frequency of tau mutations in three series of non-Alzheimer's degenerative dementia. Ann Neurol. 1999 Aug;46(2):243-8. PubMed.
  4. Guerreiro RJ, Washecka N, Hardy J, Singleton A. A thorough assessment of benign genetic variability in GRN and MAPT. Hum Mutat. 2010 Feb;31(2):E1126-40. PubMed.

Further Reading

Papers

  1. Stanford PM, Brooks WS, Teber ET, Hallupp M, McLean C, Halliday GM, Martins RN, Kwok JB, Schofield PR. Frequency of tau mutations in familial and sporadic frontotemporal dementia and other tauopathies. J Neurol. 2004 Sep;251(9):1098-104. PubMed.
  2. Roks G, Dermaut B, Heutink P, Julliams A, Backhovens H, Van de Broeck M, Serneels S, Hofman A, Van Broeckhoven C, van Duijn CM, Cruts M. Mutation screening of the tau gene in patients with early-onset Alzheimer's disease. Neurosci Lett. 1999 Dec 24;277(2):137-9. PubMed.
  3. Poorkaj P, Grossman M, Steinbart E, Payami H, Sadovnick A, Nochlin D, Tabira T, Trojanowski JQ, Borson S, Galasko D, Reich S, Quinn B, Schellenberg G, Bird TD. Frequency of tau gene mutations in familial and sporadic cases of non-Alzheimer dementia. Arch Neurol. 2001 Mar;58(3):383-7. PubMed.
  4. Ingelson M, Fabre SF, Lilius L, Andersen C, Viitanen M, Almkvist O, Wahlund LO, Lannfelt L. Increased risk for frontotemporal dementia through interaction between tau polymorphisms and apolipoprotein E epsilon4. Neuroreport. 2001 Apr 17;12(5):905-9. PubMed.

Protein Diagram

Primary Papers

  1. Poorkaj P, Bird TD, Wijsman E, Nemens E, Garruto RM, Anderson L, Andreadis A, Wiederholt WC, Raskind M, Schellenberg GD. Tau is a candidate gene for chromosome 17 frontotemporal dementia. Ann Neurol. 1998 Jun;43(6):815-25. PubMed.

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