Somatic and de novo Germline Variants of MEDs in Human Neural Tube Defects
Open Access
- 4 March 2021
- journal article
- research article
- Published by Frontiers Media SA in Frontiers in Cell and Developmental Biology
Abstract
Background Neural tube defects (NTDs) are among the most common and severe congenital defects in humans. Their genetic etiology is complex and remains poorly understood. The Mediator complex (MED) plays a vital role in neural tube development in animal models. However, no studies have yet examined the role of its human homolog in the etiology of NTDs. Methods In this study, 48 pairs of neural lesion site and umbilical cord tissues from NTD and 21 case-parent trios were involved in screening for NTD-related somatic and germlinede novovariants. A series of functional cell assays were performed. We generated aMed12p.Arg1784Cys knock-in mouse using CRISPR/Cas9 technology to validate the human findings. Results One somatic variant,MED12p.Arg1782Cys, was identified in the lesion site tissue from an NTD fetus. This variant was absent in any other normal tissue from different germ layers of the same case. In 21 case-parent trios, onede novostop-gain variant,MED13Lp.Arg1760∗, was identified. Cellular functional studies showed thatMED12p.Arg1782Cys decreased MED12 protein level and affected the regulation ofMED12on the canonical-WNT signaling pathway. TheMed12p.Arg1784Cys knock-in mouse exhibited exencephaly and spina bifida. Conclusion These findings provide strong evidence that functional variants ofMEDgenes are associated with the etiology of some NTDs. We demonstrated a potentially important role for somatic variants in the occurrence of NTDs. Our study is the first study in which an NTD-related variant identified in humans was validated in mice using CRISPR/Cas9 technology.Keywords
This publication has 41 references indexed in Scilit:
- Two novel PIWI families: roles in inter-genomic conflicts in bacteria and Mediator-dependent modulation of transcription in eukaryotesBiology Direct, 2013
- Sturge–Weber Syndrome and Port-Wine Stains Caused by Somatic Mutation inGNAQNew England Journal of Medicine, 2013
- Physiologic brain activity causes DNA double-strand breaks in neurons, with exacerbation by amyloid-βNature Neuroscience, 2013
- The Continuing Challenge of Understanding, Preventing, and Treating Neural Tube DefectsScience, 2013
- De novo germline and postzygotic mutations in AKT3, PIK3R2 and PIK3CA cause a spectrum of related megalencephaly syndromesNature Genetics, 2012
- Somatic Activation of AKT3 Causes Hemispheric Developmental Brain MalformationsNeuron, 2012
- A Mosaic Activating Mutation inAKT1Associated with the Proteus SyndromeNew England Journal of Medicine, 2011
- Mediator Links Epigenetic Silencing of Neuronal Gene Expression with X-Linked Mental RetardationMolecular Cell, 2008
- Somatic mosaicism in neuronal precursor cells mediated by L1 retrotranspositionNature, 2005
- Mutation and Cancer: Statistical Study of RetinoblastomaProceedings of the National Academy of Sciences, 1971