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Prenatal exome sequencing in 65 fetuses with abnormality of the corpus callosum: contribution to further diagnostic delineation.
Genetics in Medicine ( IF 8.8 ) Pub Date : 2020-06-22 , DOI: 10.1038/s41436-020-0872-8
Solveig Heide 1 , Myrtille Spentchian 1 , Stéphanie Valence 2 , Julien Buratti 3 , Corinne Mach 3 , Elodie Lejeune 3 , Valérie Olin 3 , Marta Massimello 1 , Daphné Lehalle 1 , Linda Mouthon 1 , Sandra Whalen 4 , Anne Faudet 1 , Cyril Mignot 1 , Catherine Garel 5 , Eleonore Blondiaux 5 , Mathilde Lefebvre 6 , Geneviève Quenum-Miraillet 7 , Sandra Chantot-Bastaraud 7 , Mathieu Milh 8 , Florence Bretelle 9 , Vincent des Portes 10 , Laurent Guibaud 11 , Audrey Putoux 12 , Vassili Tsatsaris 13 , Marta Spodenkiewic 14 , Valérie Layet 15 , Rodolphe Dard 16 , Laurent Mandelbrot 17 , Agnès Guet 18 , Sébastien Moutton 19 , Magali Gorce 20 , Mathilde Nizon 21 , Marie Vincent 21 , Claire Beneteau 21 , Marie-Amélie Rocchisanni 22 , Alexandra Benachi 23 , Julien Saada 23 , Tania Attié-Bitach 24 , Lucie Guilbaud 25 , Paul Maurice 25 , Stéphanie Friszer 25 , Jean-Marie Jouannic 25 , Thierry Billette de Villemeur 2 , Marie-Laure Moutard 2 , Boris Keren 3 , Delphine Héron 1
Affiliation  

Purpose

Abnormality of the corpus callosum (AbnCC) is etiologically a heterogeneous condition and the prognosis in prenatally diagnosed cases is difficult to predict. The purpose of our research was to establish the diagnostic yield using chromosomal microarray (CMA) and exome sequencing (ES) in cases with prenatally diagnosed isolated (iAbnCC) and nonisolated AbnCC (niAbnCC).

Methods

CMA and prenatal trio ES (pES) were done on 65 fetuses with iAbnCC and niAbnCC. Only pathogenic gene variants known to be associated with AbnCC and/or intellectual disability were considered.

Results

pES results were available within a median of 21.5 days (9–53 days). A pathogenic single-nucleotide variant (SNV) was identified in 12 cases (18%) and a pathogenic CNV was identified in 3 cases (4.5%). Thus, the genetic etiology was determined in 23% of cases. In all diagnosed cases, the results provided sufficient information regarding the neurodevelopmental prognosis and helped the parents to make an informed decision regarding the outcome of the pregnancy.

Conclusion

Our results show the significant diagnostic and prognostic contribution of CMA and pES in cases with prenatally diagnosed AbnCC. Further prospective cohort studies with long-term follow-up of the born children will be needed to provide accurate prenatal counseling after a negative pES result.



中文翻译:

65 例胼胝体异常胎儿的产前外显子组测序:有助于进一步诊断。

目的

胼胝体异常 (AbnCC) 在病因学上是一种异质性疾病,产前诊断病例的预后难以预测。我们研究的目的是确定使用染色体微阵列 (CMA) 和外显子组测序 (ES) 在产前诊断的分离型 (iAbnCC) 和非分离型 AbnCC (niAbnCC) 病例中的诊断率。

方法

对 65 名患有 iAbnCC 和 niAbnCC 的胎儿进行了 CMA 和产前三重奏 ES (pES)。仅考虑了已知与 AbnCC 和/或智力残疾相关的致病基因变异。

结果

pES 结果可在中位数 21.5 天(9-53 天)内获得。在 12 例 (18%) 中鉴定出致病性单核苷酸变异 (SNV),在 3 例 (4.5%) 中鉴定出致病性 CNV。因此,在 23% 的病例中确定了遗传病因。在所有确诊病例中,结果提供了有关神经发育预后的充分信息,并帮助父母就妊娠结果做出明智的决定。

结论

我们的研究结果显示 CMA 和 pES 在产前诊断的 AbnCC 病例中的显着诊断和预后贡献。在 pES 结果阴性后,需要对出生儿童进行长期随访的进一步前瞻性队列研究,以提供准确的产前咨询。

更新日期:2020-06-22
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