Full-sib mating can reduce deleterious effects associated with residual sperm inheritance in gynogenotes

A. Shirak, R. R. Avtalion

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Fertilization of Oreochromis aureus eggs with UV-irradiated sperm from the closely related species O. niloticus, followed by diploidy restoration, produced offspring with lower embryo viability and higher skeletal deformation rates than siblings generated with sperm from a genetically distant species (Tilapia zillii). Results showed that: (a) deleterious effects due to O. niloticus sperm accumulate in gynogenetic fish over generations; (b) such effects are eliminated when using T. zillii sperm to fertilize eggs from gynogenetic mothers produced by full-sib matings. These results suggest that: (a) deleterious effects are associated with residual male DNA fragments which may be passed on to descendent offspring; (b) such fragments are significantly purged following full-sib mating. These findings suggest that biparental reproduction may play an important role in the control of genome integrality by purging supernumerary chromosome fragments.

Original languageEnglish
Pages (from-to)15-22
Number of pages8
JournalIsraeli Journal of Aquaculture - Bamidgeh
Volume53
Issue number1
StatePublished - 2001

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