title: Detection of rare Leydig cell hypoplasia in somatic cell cloned male piglets.
abstract: In this investigation, 22 cloned male piglets were obtained by male fetal fibroblast-cell-derived nuclear transfer. Eighteen of the cloned animals died. The two cell lines did not differ significantly with regard to efficiency of live piglet production. The gross anatomy of the testes of male piglets that died was normal. However, one piglet displayed Leydig cell hypoplasia (LCH). No anatomical defects were detected in the testes of other cloned male piglets. TUNEL analysis of the testis with LCH revealed significant apoptosis in the Leydig cells, while apoptosis was rarely detected in Sertoli cells and spermatogonia. In contrast, testes from the remaining 17 piglets that died appeared normal in size, and their Sertoli and Leydig cell numbers were comparable to those in control piglet testes. Although cloned piglets were derived from fibroblasts obtained from the same fetus, phenotypic instability between cells used for the production of somatic cell cloned piglets suggests that abnormalities in male cloned piglets are caused not by technical problems and/or reprogramming effects, but rather by epigenetically and/or genetically damaged cell-specific effects.
authors.affiliation: Division of Applied Life Science, GyeongSang National University, Jinju, GyeongNam, Korea.
authors.forename: Mi-Rung
authors.initials: MR
authors.lastname: Park
authors.forename: Seong-Keun
authors.initials: SK
authors.lastname: Cho
authors.forename: Jong-Yi
authors.initials: JY
authors.lastname: Park
authors.forename: So-Young
authors.initials: SY
authors.lastname: Lee
authors.forename: Yun-Jung
authors.initials: YJ
authors.lastname: Choi
authors.forename: Deug-Nam
authors.initials: DN
authors.lastname: Kwon
authors.forename: Woo-Jin
authors.initials: WJ
authors.lastname: Son
authors.forename: Han-Geuk
authors.initials: HG
authors.lastname: Seo
authors.forename: Jin-Hoi
authors.initials: JH
authors.lastname: Kim
mesh_terms: D000818:Animals; D019976:Cloning, Organism; D020732:Cytogenetic Analysis; D012734:Disorders of Sex Development / Q000473:pathology / Q000662:veterinary*; D005260:Female; D005347:Fibroblasts / Q000502:physiology; D020287:In Situ Nick-End Labeling; D007985:Leydig Cells / Q000473:pathology*; D008297:Male; D018895:Microsatellite Repeats / Q000235:genetics; D053652:Nuclear Transfer Techniques; D010641:Phenotype; D016133:Polymerase Chain Reaction; D034421:Sus scrofa; D013553:Swine Diseases / Q000473:pathology*