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Identification of noval mutations in basic hair keratins hHb1 and hHb6 in monilethrix: implications for protein structure and clinical phenotype

Record type: Article

Monilethrix is an hereditary hair dystrophy recently shown to be due to mutations in the helix termination motif of two type II (basic) human hair keratin genes, hHb1 and hHb6. It has been suggested that mutation in hHb1 produces a less severe phenotype. We have studied hair keratin genes and clinical features in 18 unrelated pedigrees of monilethrix from Germany, Scotland, Northern Ireland, and Portugal, in 13 of which mutations have not previously been identified. By examining the rod domains of hHb1, hHb3 and hHb6, we have identified mutations in nine of the new pedigrees. We again found the glutamine-lysine substitution (E413K) in the helix termination motif of hHb6 in two families, and in another, the corresponding E413K substitution in the hHb1 gene. In four families a similar substitution E402K was present in a nearby residue. In addition two novel mutations within the helix initiation motif of hHb6 were found in Scottish and Portuguese cases, in whom the same highly conserved asparagine residue N114 was mutated to histidine (N114H) or aspartic acid (N114D) residues, respectively. In four other monilethrix pedigrees mutations in these domains of hHb1, hHb3, and hHb6 were not found. The mutations identified predict a variety of possible structural consequences for the keratin molecule. A comparison of clinical features and severity between cases with hHb1 and hHb6 mutations does not suggest distinct effects on phenotype, with the possible exception of nail dystrophy, commoner with hHb1 defects. Other factors are required to explain the marked variation in clinical severity within and between cases.

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Citation

Korge, Bernhard P., Hamm, Henning, Jury, Catherine S., Traupe, Heiko, Irvine, Alan D., Healy, Eugene, Birch-Machin, Mark, Rees, Jonthan L., Messenger, Andrew G., Holmes, Susan C., Parry, David A. D. and Munro, Colin S. (1999) Identification of noval mutations in basic hair keratins hHb1 and hHb6 in monilethrix: implications for protein structure and clinical phenotype Journal of Investigative Dermatology, 113, (4), pp. 607-612. (doi:10.1046/j.1523-1747.1999.00722.x). (PMID:10504448).

More information

Published date: October 1999
Keywords: hair diseases, hair keratins, intermediate filaments, monilethrix, protein structure
Organisations: Clinical & Experimental Sciences

Identifiers

Local EPrints ID: 334294
URI: http://eprints.soton.ac.uk/id/eprint/334294
ISSN: 0022-202X
PURE UUID: f1e61061-cd6f-4b01-9714-b181fd614731

Catalogue record

Date deposited: 13 Mar 2012 12:15
Last modified: 18 Jul 2017 06:12

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Contributors

Author: Bernhard P. Korge
Author: Henning Hamm
Author: Catherine S. Jury
Author: Heiko Traupe
Author: Alan D. Irvine
Author: Eugene Healy
Author: Mark Birch-Machin
Author: Jonthan L. Rees
Author: Andrew G. Messenger
Author: Susan C. Holmes
Author: David A. D. Parry
Author: Colin S. Munro

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