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Case Reports
. 2016 May;37(5):469-72.
doi: 10.1002/humu.22966. Epub 2016 Feb 23.

Mutations of the RTEL1 Helicase in a Hoyeraal-Hreidarsson Syndrome Patient Highlight the Importance of the ARCH Domain

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Case Reports

Mutations of the RTEL1 Helicase in a Hoyeraal-Hreidarsson Syndrome Patient Highlight the Importance of the ARCH Domain

Laurent Jullien et al. Hum Mutat. .

Abstract

The DNA helicase RTEL1 participates in telomere maintenance and genome stability. Biallelic mutations in the RTEL1 gene account for the severe telomere biology disorder characteristic of the Hoyeraal-Hreidarsson syndrome (HH). Here, we report a HH patient (P4) carrying two novel compound heterozygous mutations in RTEL1: a premature stop codon (c.949A>T, p.Lys317*) and an intronic deletion leading to an exon skipping and an in-frame deletion of 25 amino-acids (p.Ile398_Lys422). P4's cells exhibit short and dysfunctional telomeres similarly to other RTEL1-deficient patients. 3D structure predictions indicated that the p.Ile398_Lys422 deletion affects a part of the helicase ARCH domain, which lines the pore formed with the core HD and the iron-sulfur cluster domains and is highly specific of sequences from the eukaryotic XPD family members.

Keywords: ARCH domain; Hoyeraal-Hreidarsson syndrome; RTEL1; Telomere; XPD.

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