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An n-allele model for progressive amplification in the FMR1 locus

An n-allele model for progressive amplification in the FMR1 locus
An n-allele model for progressive amplification in the FMR1 locus

An n-allele model is developed for the FMR1 locus, which causes the fragile X syndrome, where n is the number of triplet repeats in the first exon. Frequencies in the general population and in index families are used to generate an n to n + δ transition matrix that predicts specific risks in satisfactory agreement with observation. However, until sequencing distinguishes between stable and unstable alleles with the same value of n, it is premature to infer whether allelic frequencies at the FMR1 locus are at equilibrium or, as some have suggested, are evolving toward higher frequencies of the pathogenic allele.

fragile X syndrome, mutation
0027-8424
4833-4837
Morris, A.
6e00b629-f6bb-4541-a4e2-f87abd7c7527
Morton, N. E.
c668e2be-074a-4a0a-a2ca-e8f51830ebb7
Collins, A.
7daa83eb-0b21-43b2-af1a-e38fb36e2a64
Macpherson, J.
8a0efba7-4e0f-44f2-bc47-8c006cbd2d8c
Nelson, D.
e8b6beba-0f54-4c4b-9143-d53ef997e671
Sherman, S.
5ccafb6e-ca3e-4019-9db7-e64a6cb3c11f
Morris, A.
6e00b629-f6bb-4541-a4e2-f87abd7c7527
Morton, N. E.
c668e2be-074a-4a0a-a2ca-e8f51830ebb7
Collins, A.
7daa83eb-0b21-43b2-af1a-e38fb36e2a64
Macpherson, J.
8a0efba7-4e0f-44f2-bc47-8c006cbd2d8c
Nelson, D.
e8b6beba-0f54-4c4b-9143-d53ef997e671
Sherman, S.
5ccafb6e-ca3e-4019-9db7-e64a6cb3c11f

Morris, A., Morton, N. E., Collins, A., Macpherson, J., Nelson, D. and Sherman, S. (1995) An n-allele model for progressive amplification in the FMR1 locus. Proceedings of the National Academy of Sciences, 92 (11), 4833-4837. (doi:10.1073/pnas.92.11.4833).

Record type: Article

Abstract

An n-allele model is developed for the FMR1 locus, which causes the fragile X syndrome, where n is the number of triplet repeats in the first exon. Frequencies in the general population and in index families are used to generate an n to n + δ transition matrix that predicts specific risks in satisfactory agreement with observation. However, until sequencing distinguishes between stable and unstable alleles with the same value of n, it is premature to infer whether allelic frequencies at the FMR1 locus are at equilibrium or, as some have suggested, are evolving toward higher frequencies of the pathogenic allele.

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More information

Published date: 23 May 1995
Keywords: fragile X syndrome, mutation

Identifiers

Local EPrints ID: 479983
URI: http://eprints.soton.ac.uk/id/eprint/479983
ISSN: 0027-8424
PURE UUID: 5e8a4d62-bb16-44f7-baef-2aa9c9db0693
ORCID for A. Collins: ORCID iD orcid.org/0000-0001-7108-0771

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Date deposited: 31 Jul 2023 17:02
Last modified: 17 Mar 2024 02:38

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Contributors

Author: A. Morris
Author: N. E. Morton
Author: A. Collins ORCID iD
Author: J. Macpherson
Author: D. Nelson
Author: S. Sherman

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