Abstract
Anorectal malformations (ARM) are rare congenital malformations of the gastrointestinal tract. Approximately 60 % of the patients have additional congenital malformations, such as hypospadias. A recently published article showed that deletion of one single gene, dickkopf WNT signaling pathway inhibitor-1 (Dkk1), resulted in an imperforate anus with rectourinary fistula and preputial hypospadias in mice. To determine whether DKK1 also plays a role in the etiology of ARM and hypospadias in humans, we sequenced the four exons of the DKK1 gene in 17 patients affected with both ARM and hypospadias. No new potential disease-causing variant was identified. However, we detected a known non-synonymous variant in one patient, which was predicted in silico to be damaging, and the corresponding unaffected amino acid is highly conserved.
Conclusion: In this human study, a potential interesting non-synonymous variant was found in the DKK1 gene. Whether this variant plays a contributory role in the genesis of ARM or hypospadias would require a much larger study.
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Abbreviations
- ARM:
-
Anorectal malformations
- PCR:
-
Polymerase chain reaction
- UTR:
-
Untranslated region
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Acknowledgments
We thank the surgical and other staff members of the Departments of Surgery-Pediatric surgery and Urology-Pediatric urology, Radboudumc Amalia Children’s Hospital of the Radboud university medical center in Nijmegen, the Department of Pediatric Surgery of the Sophia Children’s Hospital, and the Department of Clinical Genetics of the Erasmus Medical Centre in Rotterdam for their collaboration in collecting data from patients. We also thank the staff members of the Department of Human Genetics from the Radboud university medical center in Nijmegen for their guidance and assistance with Sanger sequencing. Finally, we are grateful to the patients who participated in this study. This study was funded by the Radboud university medical center, Nijmegen, The Netherlands.
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The authors have no conflict of interest to disclose.
Ethical standards
The AGORA study protocol was approved by the Regional Committee on Research Involving Human Subjects Arnhem-Nijmegen, and written informed consent was obtained from all participants and/or their parents.
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Communicated by Beat Steinmann
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van de Putte, R., Wijers, C.H.W., de Blaauw, I. et al. Sequencing of the DKK1 gene in patients with anorectal malformations and hypospadias. Eur J Pediatr 174, 583–587 (2015). https://doi.org/10.1007/s00431-014-2436-x
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DOI: https://doi.org/10.1007/s00431-014-2436-x