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A novel missense variant in CUL3 shows altered binding ability to BTB-adaptor proteins leading to diverse phenotypes of CUL3-related disorders

Journal of Human Genetics volume 66, pages 491–498 (2021)Cite this article

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Abstract

CUL3 forms Cullin-Ring ubiquitin ligases (CRL) with Ring-box protein and BTB-adaptor proteins. A variety of BTB-adaptor proteins have been reported to interact with the N-terminus of CUL3, which makes it possible to recognize various substrates for degradation. Regarding the association of CUL3 with neurodevelopmental disorders, a recent study reported three patients with global developmental delay, who carried de novo variants in CUL3. Here, we describe a novel de novo CUL3 variant (c.158G > A, p.Ser53Asn) identified in a patient with global developmental delay, who presented some novel dysmorphic features, including macrocephaly, characteristic facial features, and cutis marmorata. Immunoprecipitation and immunoblot analyses identified significantly weaker binding ability to some BTB proteins in CUL3-S53N compared to wild-type. Interestingly, label-free quantification proteomics analysis of samples immunoprecipitated by CUL3-S53N showed a significantly decreased interaction with some BTB proteins, while almost equal interaction or significantly increased interaction was observed with other BTB proteins. The binding between CUL3 and BTB proteins is essential for CRL substrate recognition, and alteration of their interaction is thought to result in the quantitative alteration in substrate proteins. It is possible that the difference of dysmorphic features between the present case and previously reported cases is caused by the distinctive effect of each CUL3 variant on substrate proteins. The clinical information of the present case will expand the picture of CUL3-related global developmental disorders, and subsequent cell biological analysis of the novel mutation will provide insight into the underlying molecular mechanism of how CUL3 pathogenic variants cause neurological disorders.

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Acknowledgements

The authors thank the patient and his parents for participating in this study. We thank Dr Kentaro Taki for technical assistance with proteomics analysis. We thank Drs Mitsuko Nakashima and Hirotomo Saitsu for providing the plasmid constructs.

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Authors and Affiliations

  1. Department of Pediatrics and Neonatology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan

    Kohji Kato & Shinji Saitoh

  2. Department of Pediatrics, Aichi Developmental Disability Center, Aichi, Japan

    Kohji Kato & Seiji Mizuno

  3. Department of Genetics, Research Institute of Environmental Medicine, Nagoya University, Nagoya, Japan

    Kohji Kato & Yasuyoshi Oka

  4. Department of Medical Science Mathematics, Medical Research Institute, Tokyo Medical and Dental University, Tokyo, Japan

    Fuyuki Miya

  5. Laboratory for Medical Science Mathematics, RIKEN Center for Investigative Medical Sciences, Yokohama, Japan

    Fuyuki Miya

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  1. Kohji Kato
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  4. Seiji Mizuno
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Correspondence to Shinji Saitoh.

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The authors declare that they have no conflict of interest.

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This study was approved by the Institutional Review Board of Nagoya City University Graduate School of Medical Sciences, and written informed consent was obtained from the patient’s parents.

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Kato, K., Miya, F., Oka, Y. et al. A novel missense variant in CUL3 shows altered binding ability to BTB-adaptor proteins leading to diverse phenotypes of CUL3-related disorders. J Hum Genet 66, 491–498 (2021). https://doi.org/10.1038/s10038-020-00868-9

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