Hypomorphic Mutations in TONSL Cause SPONASTRIME Dysplasia

Hae Ryung Chang, Sung Yoon Cho, Jae Hoon Lee, Eunkyung Lee, Jieun Seo, Hye Ran Lee, Denise P. Cavalcanti, Outi Mäkitie, Helena Valta, Katta M. Girisha, Chung Lee, Kausthubham Neethukrishna, Gandham S. Bhavani, Anju Shukla, Sheela Nampoothiri, Shubha R. Phadke, Mi Jung Park, Shiro Ikegawa, Zheng Wang, Martin R. HiggsGrant S. Stewart, Eunyoung Jung, Myeong Sok Lee, Jong Hoon Park, Eun A. Lee, Hongtae Kim, Kyungjae Myung, Woosung Jeon, Kyoungyeul Lee, Dongsup Kim, Ok Hwa Kim, Murim Choi, Han Woong Lee, Yonghwan Kim, Tae Joon Cho

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Abstract

SPONASTRIME dysplasia is a rare, recessive skeletal dysplasia characterized by short stature, facial dysmorphism, and aberrant radiographic findings of the spine and long bone metaphysis. No causative genetic alterations for SPONASTRIME dysplasia have yet been determined. Using whole-exome sequencing (WES), we identified bi-allelic TONSL mutations in 10 of 13 individuals with SPONASTRIME dysplasia. TONSL is a multi-domain scaffold protein that interacts with DNA replication and repair factors and which plays critical roles in resistance to replication stress and the maintenance of genome integrity. We show here that cellular defects in dermal fibroblasts from affected individuals are complemented by the expression of wild-type TONSL. In addition, in vitro cell-based assays and in silico analyses of TONSL structure support the pathogenicity of those TONSL variants. Intriguingly, a knock-in (KI) Tonsl mouse model leads to embryonic lethality, implying the physiological importance of TONSL. Overall, these findings indicate that genetic variants resulting in reduced function of TONSL cause SPONASTRIME dysplasia and highlight the importance of TONSL in embryonic development and postnatal growth.

Original languageEnglish
Pages (from-to)439-453
Number of pages15
JournalAmerican Journal of Human Genetics
Volume104
Issue number3
DOIs
Publication statusPublished - 2019 Mar 7

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All Science Journal Classification (ASJC) codes

  • Genetics
  • Genetics(clinical)

Cite this

Chang, H. R., Cho, S. Y., Lee, J. H., Lee, E., Seo, J., Lee, H. R., Cavalcanti, D. P., Mäkitie, O., Valta, H., Girisha, K. M., Lee, C., Neethukrishna, K., Bhavani, G. S., Shukla, A., Nampoothiri, S., Phadke, S. R., Park, M. J., Ikegawa, S., Wang, Z., ... Cho, T. J. (2019). Hypomorphic Mutations in TONSL Cause SPONASTRIME Dysplasia. American Journal of Human Genetics, 104(3), 439-453. https://doi.org/10.1016/j.ajhg.2019.01.009