Loss of RAD9B impairs early neural development and contributes to the risk for human spina bifida

Xuanye Cao, Tian Tian, John W. Steele, Robert M. Cabrera, Vanessa Aguiar-Pulido, Shruti Wadhwa, Nikitha Bhavani, Patrick Bi, Nick H. Gargurevich, Ethan N. Hoffman, Chun Quan Cai, Nicholas J. Marini, Wei Yang, Gary M. Shaw, Margaret E. Ross, Richard H. Finnell, Yunping Lei

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

DNA damage response (DDR) genes orchestrating the network of DNA repair, cell cycle control, are essential for the rapid proliferation of neural progenitor cells. To date, the potential association between specific DDR genes and the risk of human neural tube defects (NTDs) has not been investigated. Using whole-genome sequencing and targeted sequencing, we identified significant enrichment of rare deleterious RAD9B variants in spina bifida cases compared to controls (8/409 vs. 0/298; p =.0241). Among the eight identified variants, the two frameshift mutants and p.Gln146Glu affected RAD9B nuclear localization. The two frameshift mutants also decreased the protein level of RAD9B. p.Ser354Gly, as well as the two frameshifts, affected the cell proliferation rate. Finally, p.Ser354Gly, p.Ser10Gly, p.Ile112Met, p.Gln146Glu, and the two frameshift variants showed a decreased ability for activating JNK phosphorylation. RAD9B knockdowns in human embryonic stem cells profoundly affected early differentiation through impairing PAX6 and OCT4 expression. RAD9B deficiency impeded in vitro formation of neural organoids, a 3D cell culture model for human neural development. Furthermore, the RNA-seq data revealed that loss of RAD9B dysregulates cell adhesion genes during organoid formation. These results represent the first demonstration of a DDR gene as an NTD risk factor in humans.

Original languageEnglish (US)
Pages (from-to)786-799
Number of pages14
JournalHuman mutation
Volume41
Issue number4
DOIs
StatePublished - Apr 1 2020
Externally publishedYes

Keywords

  • DNA damage response
  • RAD9B
  • spina bifida
  • stem cell

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

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