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Mapping of monilethrix to the type II keratin gene cluster at chromosome 12q13 in three new families, including one with variable expressivity

Mapping of monilethrix to the type II keratin gene cluster at chromosome 12q13 in three new families, including one with variable expressivity
Mapping of monilethrix to the type II keratin gene cluster at chromosome 12q13 in three new families, including one with variable expressivity
Monilethrix is an autosomal dominant disorder chiefly affecting hair. The degree of hair dystrophy is highly variable, as is the presence of additional features, such as follicular keratoses. In three British families of monilethrix, linkage has recently been reported to the type II keratin gene cluster at chromosome 12q13, and it has been suggested that the disease is due to a defect in the hard keratins of hair and nail. If monilethrix is a keratin disorder, we would predict that some pedigrees might map to the type I keratin gene cluster on 17q where hard keratin genes are also found. We have now studied clinically and by linkage analysis three new and unrelated pedigrees from England, Scotland and Spain, the first of which showed a variant phenotype. In this family the disease was expressed in four of 12 cases only as a follicular keratosis of the neck, elbows and knees, and without clinical or historical evidence of hair anomalies: non-penetrance in an obligate carrier was also observed. In all three families, we have established linkage to a series of microsatellite markers at the type II locus at 12q13 (Zmax=6.34 at 0=0.00 for D12S368) and have excluded linkage from the type I keratin gene cluster on 17q. It remains probable that monilethrix is a disorder of hard keratins, but at present there is no evidence that it is due to defects in type I keratins.
0007-0963
339-343
Birch-Machin, M.A.
72530a10-22ba-43c9-997a-8c42077b9e9a
Healy, E.
400fc04d-f81a-474a-ae25-7ff894be0ebd
Turner, R.
75d54419-24e4-4f1e-9135-057491dce3cf
Haldane, F.
23ad2fbc-2769-49bc-83ab-4c5e5b076acb
Belgaid, C.E.
37cb14c7-ad83-4824-9987-af4f4fe80a8b
Darlington, S.
e67db940-ffb1-4c7e-a525-95b95e7638af
Stephenson, A.M.
03be1d24-824f-49af-ad4d-d361d70b6e4e
Munro, C.
ec84cd1c-fb1b-4337-8b4b-e4805a9b2bed
Messenger, A.G.
adebdb31-2864-425d-a769-0ffc6057756b
Rees, J.L.
4884fa5d-84c0-45da-b2a3-a096bfd21c9b
Birch-Machin, M.A.
72530a10-22ba-43c9-997a-8c42077b9e9a
Healy, E.
400fc04d-f81a-474a-ae25-7ff894be0ebd
Turner, R.
75d54419-24e4-4f1e-9135-057491dce3cf
Haldane, F.
23ad2fbc-2769-49bc-83ab-4c5e5b076acb
Belgaid, C.E.
37cb14c7-ad83-4824-9987-af4f4fe80a8b
Darlington, S.
e67db940-ffb1-4c7e-a525-95b95e7638af
Stephenson, A.M.
03be1d24-824f-49af-ad4d-d361d70b6e4e
Munro, C.
ec84cd1c-fb1b-4337-8b4b-e4805a9b2bed
Messenger, A.G.
adebdb31-2864-425d-a769-0ffc6057756b
Rees, J.L.
4884fa5d-84c0-45da-b2a3-a096bfd21c9b

Birch-Machin, M.A., Healy, E., Turner, R., Haldane, F., Belgaid, C.E., Darlington, S., Stephenson, A.M., Munro, C., Messenger, A.G. and Rees, J.L. (1997) Mapping of monilethrix to the type II keratin gene cluster at chromosome 12q13 in three new families, including one with variable expressivity. British Journal of Dermatology, 137 (3), 339-343. (doi:10.1046/j.1365-2133.1997.18461954.x). (PMID:9349326)

Record type: Article

Abstract

Monilethrix is an autosomal dominant disorder chiefly affecting hair. The degree of hair dystrophy is highly variable, as is the presence of additional features, such as follicular keratoses. In three British families of monilethrix, linkage has recently been reported to the type II keratin gene cluster at chromosome 12q13, and it has been suggested that the disease is due to a defect in the hard keratins of hair and nail. If monilethrix is a keratin disorder, we would predict that some pedigrees might map to the type I keratin gene cluster on 17q where hard keratin genes are also found. We have now studied clinically and by linkage analysis three new and unrelated pedigrees from England, Scotland and Spain, the first of which showed a variant phenotype. In this family the disease was expressed in four of 12 cases only as a follicular keratosis of the neck, elbows and knees, and without clinical or historical evidence of hair anomalies: non-penetrance in an obligate carrier was also observed. In all three families, we have established linkage to a series of microsatellite markers at the type II locus at 12q13 (Zmax=6.34 at 0=0.00 for D12S368) and have excluded linkage from the type I keratin gene cluster on 17q. It remains probable that monilethrix is a disorder of hard keratins, but at present there is no evidence that it is due to defects in type I keratins.

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Published date: September 1997
Organisations: Clinical & Experimental Sciences

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Local EPrints ID: 334242
URI: http://eprints.soton.ac.uk/id/eprint/334242
ISSN: 0007-0963
PURE UUID: c4f08855-1041-43b2-b449-22fb3ea460b5

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Date deposited: 15 Mar 2012 16:43
Last modified: 14 Mar 2024 10:34

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Contributors

Author: M.A. Birch-Machin
Author: E. Healy
Author: R. Turner
Author: F. Haldane
Author: C.E. Belgaid
Author: S. Darlington
Author: A.M. Stephenson
Author: C. Munro
Author: A.G. Messenger
Author: J.L. Rees

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