Abstract:
INTRODUCTION:Thyroid dysgenesis (TD) is the main cause of congenital hypothyroidism (CH), affecting nearly 1 in 2000-3000 newborns worldwide, as the most common neonatal endocrine disorder. Paired box gene 8 (PAX8), expressed during all stages of thyroid follicular cell, plays a key role in thyroid morphogenesis by a complex regulatory network. In conclusion, the genetic mechanism of PAX8 mutant in TD is still ambiguous; therefore, further research is needed. MATERIAL AND METHODS:Blood samples were collected from 289 TD patients in Shandong Province, China. Genomic DNA was extracted from peripheral blood. All the exons of PAX8 along with their exon-intro boundaries were amplified by PCR and analysed by Sanger sequencing. RESULTS:We identified three novel PAX8 nonsense mutations in three patients by sequence analysis of PAX8: Patient 1 (c.285C>G, p.Tyr95Ter), Patient 2 (c.747T>G, p.Tyr249Ter), and Patient 3 (c.786C>A, p.Tyr262Ter). All the three patients carrying PAX8 variants had obvious clinical phenotypes of thyroid anomaly, such as hypoplasia and athyreosis. CONCLUSION:We conducted the largest worldwide PAX8 mutation screening so far in TD patients. Three presumably pathogenic PAX8 mutations were detected in 289 TD cases for the first time, showing the mutation rate of PAX8 is 1.04% in Chinese TD patients. In addition, our study expands the gene mutation spectrum of TD.
journal_name
Endokrynol Poljournal_title
Endokrynologia Polskaauthors
Li M,Wang F,Wang X,Zang Y,Liu W,Wang F,Zhang L,Tang Q,Liu S,Zhao Ddoi
10.5603/EP.a2020.0004subject
Has Abstractpub_date
2020-01-01 00:00:00pages
153-159issue
2eissn
0423-104Xissn
2299-8306pii
VM/OJS/J/66225journal_volume
71pub_type
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