Journal Article

16p13.11 microduplication in 45 new patients: refined clinical significance and genotype–phenotype correlations

Laroche, Cécile, De Pontual, Loïc, Gerard, Marion, Goldenberg, Alice, Le Meur, Nathalie, François-Fiquet, Caroline, Yardin, Catherine, Lebbar, Aziza, Chafai Elalaoui, Siham, Receveur, Aline, Benzacken, Brigitte, Dupont, Jean Michel, Andrieux, Joris, Edery, Patrick, Vago, Philippe, Mathieu-Dramard, Michèle, Marle, Nathalie, Lesca, Gaetan, Pipiras, Eva, Chantot-Bastaraud, Sandra, Rossi, Massimiliano, Doco Fenzy, Martine, Allach El Khattabi, Laïla, Missirian, Chantal, Plessis, Ghislaine, Boute-Benejean, Odile, Heide, Solveig, Afenjar, Alexandra, Masurel-Paulet, Alice, Delahaye-Duriez, Andrée, Sanlaville, Damien, Mosca-Boidron, Anne-Laure, Natiq, Abdelhafid, Vincent-Delorme, Caroline, Francannet, Christine, Ioos, Christine, Faivre, Laurence, Moncla, Anne, Tabet, Anne Claude, Suiro, Lesley, Caberg, Jean-Hubert, Cordier, Marie Pierre, Callier, Patrick, Garnier, Pascal

2020

Overview

BackgroundThe clinical significance of 16p13.11 duplications remains controversial while frequently detected in patients with developmental delay (DD), intellectual deficiency (ID) or autism spectrum disorder (ASD). Previously reported patients were not or poorly characterised. The absence of consensual recommendations leads to interpretation discrepancy and makes genetic counselling challenging. This study aims to decipher the genotype–phenotype correlations to improve genetic counselling and patients’ medical care.MethodsWe retrospectively analysed data from 16 013 patients referred to 12 genetic centers for DD, ID or ASD, and who had a chromosomal microarray analysis. The referring geneticists of patients for whom a 16p13.11 duplication was detected were asked to complete a questionnaire for detailed clinical and genetic data for the patients and their parents.ResultsClinical features are mainly speech delay and learning disabilities followed by ASD. A significant risk of cardiovascular disease was noted. About 90% of the patients inherited the duplication from a parent. At least one out of four parents carrying the duplication displayed a similar phenotype to the propositus. Genotype–phenotype correlations show no impact of the size of the duplicated segment on the severity of the phenotype. However, NDE1 and miR-484 seem to have an essential role in the neurocognitive phenotype.ConclusionOur study shows that 16p13.11 microduplications are likely pathogenic when detected in the context of DD/ID/ASD and supports an essential role of NDE1 and miR-484 in the neurocognitive phenotype. Moreover, it suggests the need for cardiac evaluation and follow-up and a large study to evaluate the aortic disease risk.

• Publisher: BMJ Publishing Group LTD,BMJ Publishing Group
• Subject: 16p13.11 duplication / Aorta / Autism / Cancer / Cardiovascular diseases / Clinical significance / Cognition / Congenital diseases / Genetic counseling / Genetics / Genetics & genetic processes / Genotype & phenotype / Genotypes / Génétique & processus génétiques / Human genetics / Learning disabilities / Life Sciences / miR-484 / MYH11 / NDE1 / neurodevelopmental disorder / Patients / Phenotypes / Population / Sciences du vivant