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Single-nucleotide and copy-number variance related to severity of hypospadias

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Abstract

Background

The genetic association of hypospadias-risk studies has been conducted in Caucasians, Chinese-Han populations and few in Indian populations. However, no comprehensive approach has been followed to assess genetic involvement in the severity of the disorder.

Methods

The study evaluated to establish the correlation between genotyped single nucleotide and copy number variants (SNPs/CNVs) and severity of hypospadias by an association in a total 30 SNPs in genes related to sex hormone-biosynthesis and metabolism; embryonic-development and phospholipase-d-signalling pathways on 138 surgery-confirmed hypospadias-cases from North India (84 penile and 28 cases of penoscrotal-hypospadias as compared with 31 cases of glanular + coronal), and analyzed and identified CNVs in four familial cases (18 members) and three paired-sporadic cases (6 members) using array-based comparative-genomic-hybridization and validated in 32 hypospadias samples by TaqMan assay.

Results

Based on odds ratio at 95% CI, Z Statistic and Significance Levels, STS gene-rs17268974 was associated with Penile-Hypospadias and 9-SNPs [seven-SNPs (rs5934740; rs5934842; rs5934913; rs6639811; rs3923341; rs17268974; rs5934937)] of STS gene; rs7562326-SRD5A2 and rs1877031-STARD3 were associated with penoscrotal-hypospadias. On aggregate analysis with p < 0.001, we identified homozygous-loss of Ch7:q34 (PRSS3P2, PRSS2). On validation in previously CNV-characterized and new (32 hypospadias cases), we identified PRSS3P2-loss in most of the grade 3 and 4 hypospadias. Hence, Grade 1 and 2 (coronal and granular) show no-PRSS3P2-loss and no-association with SNPs in STS; SRD5A2; STARD3-gene but Grade 3 and 4 (Penile and Penoscrotal) show PRSS3P2-loss accompanied with the association of SNPs in STS; SRD5A2; STARD3.

Conclusions

Hence, homozygous-loss of PRSS3P2 accompanied with the association of STS; SRD5A2; STARD3 may link to the severity of the disease.

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Acknowledgements

We are grateful to Dr. Paras Yadav, Senior Application Scientist Imperial Life Sciences for technical assistance. Previously, the abstract has been submitted to “European Paediatric Surgeons’ Association-15th Congress Dublin, Ireland-2014”.

Funding

This study was funded by University Grant from King George Medical University, Lucknow, India.

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Correspondence to Neetu Singh or Devendra Kumar Gupta.

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All Authors declares that he/she has no conflict of interest.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of Institutional Review Board of the King George Medical University (Lucknow, India).

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Informed consent was obtained from all individual participants included in the study for blood collection as well as for the release of all medical records.

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Singh, N., Gupta, D.K., Sharma, S. et al. Single-nucleotide and copy-number variance related to severity of hypospadias. Pediatr Surg Int 34, 991–1008 (2018). https://doi.org/10.1007/s00383-018-4330-5

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