TBL1XR1 mutations in Pierpont syndrome are not restricted to the recurrent p.Tyr446Cys mutation

C. Lemattre 1 J. Thevenon 2, 3, 4 Y. Duffourd 2, 5, 6, 7, 8 S. Nambot 2, 4 E. Haquet 1 B. Vuadelle 9 D. Geneviève 1, 10 P. Sarda 1 A.L. Bruel 2, 4 P. Kuentz 2, 4, 11 C.F. Wells 1 L. Faivre 2, 4, 6, 8 M. Willems 1, *
* Auteur correspondant
1 Service de génétique médicale [Montpellier]
2 Equipe GAD (LNC - U1231)
LNC - Lipides - Nutrition - Cancer [Dijon - U1231]
3 Service de génétique et procréation (Grenoble)
4 UBFC - Université Bourgogne Franche-Comté [COMUE]
5 Orphanomix
6 Centre de génétique - Centre de référence des maladies rares, anomalies du développement et syndromes malformatifs (CHU de Dijon)
7 UF6254 - Unité fonctionnelle d' Innovation en Diagnostic Génomique des Maladies Rares (CHU Dijon)
8 FHU TRANSLAD
9 Lycée Philippe Lamour (Nîmes)
10 Cellules Souches, Plasticité Cellulaire, Médecine Régénératrice et Immunothérapies (IRMB)
11 Laboratoire de Biologie Moléculaire ( CHRU Saint‐Jacques, Besançon)
Abstract : Pierpont syndrome is a rare and sporadic syndrome, including developmental delay, facial characteristics, and abnormal extremities. Recently, a recurrent de novo TBL1XR1 variant (c.1337A > G; p.Tyr446Cys) has been identified in eight patients by whole‐exome sequencing. A dominant‐negative effect of this mutation is strongly suspected, since patients with TBL1XR1 deletion and other variants predicting loss of function do not share the same phenotype. We report two patients with typical Pierpont‐like syndrome features. Exome sequencing allowed identifying a de novo heterozygous missense TBL1XR1 variant in both patients, different from those already reported: p.Cys325Tyr and p.Tyr446His. The localization of these mutations and clinical features of Pierpont‐like syndrome suggest that their functional consequences are comparable with the recurrent mutation previously described, and provided additional data to understand molecular mechanisms of TBL1XR1 anomalies.
Keywords : TBL1XR1 Pierpont syndrome
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https://hal-univ-bourgogne.archives-ouvertes.fr/hal-01915588
Contributeur : Lnc - Université de Bourgogne <>
Soumis le : mercredi 7 novembre 2018 - 17:19:20
Dernière modification le : vendredi 18 octobre 2019 - 01:23:00

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UNIV-BOURGOGNE | LNC-UMR866 | LNC-GAD | BS | UNIV-MONTPELLIER

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C. Lemattre, J. Thevenon, Y. Duffourd, S. Nambot, E. Haquet, et al.. TBL1XR1 mutations in Pierpont syndrome are not restricted to the recurrent p.Tyr446Cys mutation. American Journal of Medical Genetics Part A, Wiley, 2018, 176 (12), pp.2813-2818. ⟨10.1002/ajmg.a.40510⟩. ⟨hal-01915588⟩

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