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A 25 Mainland Chinese cohort of patients with PURA-related neurodevelopmental disorders: clinical delineation and genotype–phenotype correlations

Abstract

PURA-related neurodevelopmental disorders (PURA-NDDs) include 5q31.3 microdeletion syndrome and PURA syndrome. PURA has been proposed as a candidate gene responsible for 5q31.3 microdeletion syndrome. Phenotype comparisons between patients with PURA mutations and 5q31.3 microdeletions encompassing more than PURA gene are lacking. A total of 25 previously undescribed Mainland China patients were evaluated. Clinical data were obtained from medical record review and standardized medical history questionnaire. Clinical profile and genetic spectrum of the patients with PURA syndrome and genotype–phenotype correlations between PURA mutations group and 5q31.3 microdeletions group were analyzed. Our identified seventeen de nove PURA variants were novel, and two recurrent frameshift variants, c.697_699del (p.F233del) and c.159dup (p.L54Afs*147) were detected in the four independent pedigrees. One patient with 5q31.3 microdeletion further supported the shortest overlapping region only contains PURA and IGIP gene. Developmental delay/intellectual disability, neonatal hypotonia, neonatal feeding difficulties, hypersomnolence and dysmorphic features were prominent clinical features in PURA syndrome. There was no significant difference between two groups in incidence of neonatal problems, developmental delay and common medical comorbidities. We observed a higher frequency of abnormal brain MRI and specific facial dysmorphism in 5q31.3 microdeletion group. This is the first work describing a largest cohort of Mainland China patients broaden the clinical and molecular spectrum of PURA-NDDs. Our findings not only demonstrated that PURA haploinsufficiency was a major contributor to the important phenotypes of 5q31.3 microdeletion, but also implied that additional genes still played a role in the 5q31.3 microdeletion.

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Fig. 1: Genetic characterization of PURA syndrome in our cohort.
Fig. 2: The effects of PURA variants located in different domain on protein structure.
Fig. 3: Genetic characterization of 5q31.3 microdeletion syndrome in our cohort and previously reported cohort.
Fig. 4: Representative images of seven patients with PURA mutations.

Data availability

All data generated or analyzed during this study are included in this published article (and its Supplementary Information files).

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Acknowledgements

We would like to acknowledge the affected patients and their families for the participation in the study. We also acknowledged Yue Tao for structural protein model.

Funding

This work was supported by the National Key R&D Program of China (No. 2019YFC1005100, to YGY); the National Natural Science Foundation of China (No. 82101950, to NX); Shanghai Municipal Commission of Health and Family Planning (No. 20204Y0453, to NX); the National Natural Science Foundation of China (No.81873671 and No. 82070914, to YGY); the Shanghai Science and Technology Commission (No. 19140904500, to YGY); Shanghai Municipal Education Commission-Gaofeng Clinical Medicine Grant Support (No. 20191908, to YGY).

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Authors

Contributions

KS, YY and NX: conception and design of the study; WD and NX: drafting the paper or figures; YS: review and editing the paper; BX and WD: evaluation of the pictures of individuals for the morphological analysis; YF, YG, LW and YZ: acquisition and analysis of data. BX, WQ and XG: providing partial clinical data. All authors read and approved the final paper.

Corresponding authors

Correspondence to Kun Sun, Yongguo Yu or Na Xu.

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The authors declare no competing interests.

Ethics approval

The study was conducted with the approval of Ethics Committee of Xinhua Hospital, School of Medicine, Shanghai Jiao Tong University (XHEC-D-2022-064).

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Dai, W., Sun, Y., Fan, Y. et al. A 25 Mainland Chinese cohort of patients with PURA-related neurodevelopmental disorders: clinical delineation and genotype–phenotype correlations. Eur J Hum Genet 31, 112–121 (2023). https://doi.org/10.1038/s41431-022-01217-4

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