Journal Article

Long-read sequence analysis of the <i>MECP2</i> gene in Rett syndrome patients: correlation of disease severity with mutation type and location

Jeremy P. Cheadle, Harinder Gill, Nick Fleming, Julie Maynard, Alison Kerr, Helen Leonard, Michael Krawczak, David N. Cooper, Sally Lynch, Nick Thomas, Helen Hughes, Maj Hulten, David Ravine, Julian R. Sampson and Angus Clarke

in Human Molecular Genetics

Volume 9, issue 7, pages 1119-1129
Published in print April 2000 | ISSN: 0964-6906
Published online April 2000 | e-ISSN: 1460-2083 | DOI: http://dx.doi.org/10.1093/hmg/9.7.1119
Long-read sequence analysis of the MECP2 gene in Rett syndrome patients: correlation of disease severity with mutation type and location

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Mutations in the methyl-CpG-binding protein gene MECP2 at Xq28 cause Rett syndrome (RTT), an X-linked dominant neurodevelopmental disorder characterized by a period of stagnation followed by regression in the development of young girls. Mutations were sought in MECP2 in 48 females with classical sporadic RTT, seven families with possible familial RTT and five sporadic females with features suggestive, but not diagnostic of RTT. Long distance PCR coupled with long-read direct sequencing was employed to sequence the entire MECP2 gene coding region in all cases. Mutations were identified in 44/55 (80%) unrelated classical sporadic and familial RTT patients, but only 1/5 (20%) sporadic cases with suggestive but non-diagnostic features of RTT. Twenty-one different mutations were identified (12 missense, four nonsense and five frame-shift mutations); 14 of these were novel. All missense mutations were located either in the methyl-CpG-binding domain or in the transcription repression domain. Nine recurrent mutations were characterized in a total of 33 unrelated cases (73% of all cases with MECP2 mutations). Significantly milder disease was noted in patients carrying missense mutations as compared with those with truncating mutations (P = 0.0023), and milder disease was associated with late as compared with early truncating mutations (P = 0.0190).

Journal Article.  7376 words.  Illustrated.

Subjects: Genetics and Genomics

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