Novel combined insulin-like 3 variations of a single nucleotide in cryptorchidism

Author:

Sinopidis Xenophon,Mourelatou Roza,Kostopoulou Eirini,Karvela Alexia,Rojas-Gil Andrea-Paola,Tsekoura Efstathia,Georgiou George,Spiliotis Bessie E.

Abstract

AbstractBackgroundInsulin-like 3 hormone (INSL3) is involved in the process of testicular descent, and has been thoroughly studied in cryptorchidism. However, INSL3 allelic variations found in the human genome were heterozygous and only a few of them were found exclusively in patients with cryptorchidism. Under this perspective, we aimed to study the presence of INSL3 allelic variations in a cohort of patients with cryptorchidism and to estimate their potential consequences.MethodsBlood samples were collected from 46 male patients with non-syndromic cryptorchidism and from 43 age-matched controls. DNA extraction and polymerase chain reaction (PCR) were performed for exons 1 and 2 of theINSL3gene in all subjects. Sequencing analysis was carried out on the PCR products. All data were grouped according to testicular location.ResultsSeven variations of a single nucleotide (SNVs) were identified both in patients with cryptorchidism and in controls: rs2286663 (c.27G > A), rs1047233 (c.126A > G) and rs6523 (c.178A > G) at exon 1, rs74531687 (c.191-30C > T) at the intron, rs121912556 (c.305G > A) at exon 2 and rs17750642 (c.*101C > A) and rs1003887 (c.*263G > A) at the untranslated region (UTR). The allelic variants rs74531687 and rs121912556 were found for the first time in the Greek population. The novel homozygotic combination of the three allelic variants rs1047233-rs6523-rs1003887 seemed to present a stronger correlation with more severe forms of cryptorchidism.ConclusionsThe combination of specific INSL3 SNVs rather than the existence of each one of them alone may offer a new insight into the involvement of allelic variants in phenotypic variability and severity.

Publisher

Walter de Gruyter GmbH

Subject

Endocrinology,Endocrinology, Diabetes and Metabolism,Pediatrics, Perinatology and Child Health

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