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MCT8 mutation analysis and identification of the first female with Allan–Herndon–Dudley syndrome due to loss of MCT8 expression.
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- Author(s): Frints, Suzanna Gerarda Maria; Lenzner, Steffen; Bauters, Mareike; Jensen, Lars Riff; Van Esch, Hilde; des Portes, Vincent; Moog, Ute; Macville, Merryn Victor Erik; van Roozendaal, Kees; Schrander-Stumpel, Constance Theresia Rimbertha Maria; Tzschach, Andreas; Marynen, Peter; Fryns, Jean-Pierre; Hamel, Ben; van Bokhoven, Hans; Chelly, Jamel; Beldjord, Chérif; Turner, Gillian; Gecz, Jozef; Moraine, Claude
- Source:
European Journal of Human Genetics. Sep2008, Vol. 16 Issue 9, p1029-1037. 9p. 3 Black and White Photographs, 2 Diagrams, 1 Chart, 1 Graph. - Source:
- Additional Information
- Subject Terms:
- Abstract: Mutations in the thyroid monocarboxylate transporter 8 gene (MCT8/SLC16A2) have been reported to result in X-linked mental retardation (XLMR) in patients with clinical features of the Allan–Herndon–Dudley syndrome (AHDS). We performed MCT8 mutation analysis including 13 XLMR families with LOD scores >2.0, 401 male MR sibships and 47 sporadic male patients with AHDS-like clinical features. One nonsense mutation (c.629insA) and two missense changes (c.1A>T and c.1673G>A) were identified. Consistent with previous reports on MCT8 missense changes, the patient with c.1673G>A showed elevated serum T3 level. The c.1A>T change in another patient affects a putative translation start codon, but the same change was present in his healthy brother. In addition normal serum T3 levels were present, suggesting that the c.1A>T (NM_006517) variation is not responsible for the MR phenotype but indicates that MCT8 translation likely starts with a methionine at position p.75. Moreover, we characterized a de novo translocation t(X;9)(q13.2;p24) in a female patient with full blown AHDS clinical features including elevated serum T3 levels. The MCT8 gene was disrupted at the X-breakpoint. A complete loss of MCT8 expression was observed in a fibroblast cell-line derived from this patient because of unfavorable nonrandom X-inactivation. Taken together, these data indicate that MCT8 mutations are not common in non-AHDS MR patients yet they support that elevated serum T3 levels can be indicative for AHDS and that AHDS clinical features can be present in female MCT8 mutation carriers whenever there is unfavorable nonrandom X-inactivation.European Journal of Human Genetics (2008) 16, 1029–1037; doi:10.1038/ejhg.2008.66; published online 9 April 2008 [ABSTRACT FROM AUTHOR]
- Abstract: Copyright of European Journal of Human Genetics is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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