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Validation of the sperm chromatin dispersion (SCD) test in the Amphibian Xenopus laevis using in situ nick translation and comet assay

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The integrity of sperm DNA is becoming increasingly recognised as an important parameter of semen quality, but there are no published reports of this procedure for any amphibian. The primary aim of this study was to apply a modified sperm chromatin dispersion (SCD) test (Halomax) to an amphibian sperm model (African clawed frog; Xenopus laevis) and to validate the assay against in situ nick translation (ISNT) and the double-comet assay procedure. Inactivated spermatozoa were collected from fresh testes (n=3). Sperm DNA fragmentation (SDF) for each sperm sample was conducted immediately following activation (T0) and again after 1h (T1) and 24h (T24) of incubation at room temperature in order to produce a range of spermatozoa with differing levels of DNA damage. The SCD procedure resulted in the production of three nuclear morphotypes; amphibian sperm morphotype 1 (ASM-1) and ASM-2 showed no evidence of DNA damage, whereas ASM-3 spermatozoa were highly fragmented with large halos of dispersed DNA fragments and a reduced nuclear core. ISNT confirmed that ASM-3 nuclei contained damaged DNA. There was a significant correlation (r=0.9613) between the levels of ASM-3 detected by the SCD test and SDF revealed by the double-comet assay.

Original languageEnglish
Pages (from-to)1168-1174
JournalReproduction, Fertility and Development
Volume27
Issue number8
DOIs
Publication statusPublished - 3 Jun 2014

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  • Validation_of_the_sperm_chromatin

    Rights statement: Pollock, K., Gosálvez, J., Arroyo, F., López-Fernández, C., Guille, M., Noble, A., and Johnston, S. D. (2015). Validation of the sperm chromatin dispersion (SCD) test in the amphibian Xenopus laevis using in situ nick translation and comet assay. Reprod. Fertil. Dev. 27, 1168–1174. http://dx.doi.org/10.1071/RD14070

    Accepted author manuscript (Post-print), 783 KB, PDF document

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