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Mucopolysaccharidosis III in Mainland China: natural history, clinical and molecular characteristics of 34 patients

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Veröffentlicht/Copyright: 24. Mai 2020

Abstract

Objectives

Sanfilippo syndrome (Mucopolysaccharidosis III, MPS III) is a rare autosomal recessive hereditary disease, which is caused by lysosomal enzyme deficiency. This study was operated to investigate clinical and molecular characteristics of patients with MPS III, which will improve the diagnosis and treatment of MPS III.

Method

Thirty four patients with MPS III were assessed using clinical evaluation, questionnaire, and scoring system.

Results

Among the 34 patients, 14 had MPS IIIA, 19 had MPS III B, and one had MPS III C. Speech delay (100%) and intellectual disability (100%) were the most prevalent clinical manifestations in this cohort, followed by hyperactivity (94.12%), hirsutism (91.18%), enlarged head circumference (73.52%), repeated diarrhea (67.64%), sparse teeth (67.64%), and Mongolian spots (64.71%). There were two clinical manifestations that were significantly different between IIIA and IIIB: Hepatosplenomegaly and serrated teeth. The most common initial symptoms at diagnosis were speech delay (52.94%), hyperactivity (35.29%), and mental retardation (29.41%). Genetic analysis of 25 patients was conducted, which identified 12 novel mutations.

Conclusion

When language retardation, mental retardation, and rough facial features occurred, MPS III should be considered. At same time, more examination should be operated, such as examination of changes in cranial magnetic resonance imaging of cerebral cortex atrophy. Hepatosplenomegaly and serrated teeth could be used clinically to preliminarily distinguish IIIA from IIIB.


Corresponding author: Yan Meng, Department of Pediatrics, Chinese PLA General Hospital, Beijing, 100853, China, E-mail:

Weijing Kong and Yan Meng contributed equally to this work.


Funding source: The National Key Research and Development Program of China

Award Identifier / Grant number: 2016YFC1000707

Acknowledgments

We acknowledge the participation of study patients and their families. The authors thank Dr. Cheng Lu for his assistance in biostatistics. The authors are grateful to Dr. Shunji Tomatsu for helping to make the questionnaire.

  1. Funding: This case report was supported by The National Key Research and Development Program of China (2016YFC1000707).

  2. Author contributions: YG, WJ and SXY managed and followed up the case. KWJ collected the data and wrote the manuscript. ZLP supervised the management and follow up of the case. MY supervised the management and follow up of the case, and the writing of the article. All authors read and approved the final manuscript.

  3. Competing interests: The authors declare that they have no competing interests.

  4. Ethics approval and consent to participate: We obtained informed consent from all participating patients (or their parents or carers) in accordance with the tenets of the Declaration of Helsinki. This study received approval from the Institutional Review Board of the Chinese PLA General Hospital in Beijing, China.

  5. Consent for publication: Not applicable.

  6. Availability of data and material: Data from patients can be made available from the corresponding author after discussion with the Institutional Review Board. Consent from participants for data sharing was not obtained but any shared data will be anonymised.

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Supplementary Material

The online version of this article offers supplementary material (https://doi.org/10.1515/jpem-2019-0505).

Received: 2019-10-27
Accepted: 2020-03-23
Published Online: 2020-05-24

© 2020 Walter de Gruyter GmbH, Berlin/Boston

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