title: De novo copy number variations in cloned dogs from the same nuclear donor.
abstract: BACKGROUND
  Somatic mosaicism of copy number variants (CNVs) in human body organs and de novo CNV event in monozygotic twins suggest that de novo CNVs can occur during mitotic recombination. These de novo CNV events are important for understanding genetic background of evolution and diverse phenotypes. In this study, we explored de novo CNV event in cloned dogs with identical genetic background.
  
  
  RESULTS
  We analyzed CNVs in seven cloned dogs using the nuclear donor genome as reference by array-CGH, and identified five de novo CNVs in two of the seven clones. Genomic qPCR, dye-swap array-CGH analysis and B-allele profile analysis were used for their validation. Two larger de novo CNVs (5.2 Mb and 338 Kb) on chromosomes X and 19 in clone-3 were consistently validated by all three experiments. The other three smaller CNVs (sized from 36.1 to 76.4 Kb) on chromosomes 2, 15 and 32 in clone-3 and clone-6 were verified by at least one of the three validations. In addition to the de novo CNVs, we identified a 37 Mb-sized copy neutral de novo loss of heterozygosity event on chromosome 2 in clone-6.
  
  
  CONCLUSIONS
  To our knowledge, this is the first report of de novo CNVs in the cloned dogs which were generated by somatic cell nuclear transfer technology. To study de novo genetic events in cloned animals can help understand formation mechanisms of genetic variants and their biological implications.
authors: Seung-Hyun
authors: SH
authors: Jung
authors: Seon-Hee
authors: SH
authors: Yim
authors: Hyun Ju
authors: HJ
authors: Oh
authors: Jung Eun
authors: JE
authors: Park
authors: Min Jung
authors: MJ
authors: Kim
authors: Geon A
authors: GA
authors: Kim
authors: Tae-Min
authors: TM
authors: Kim
authors: Jin-Soo
authors: JS
authors: Kim
authors: Integrated Research Center for Genome Polymorphism, Department of Microbiology, The Catholic University of Korea, College of Medicine, 505 Banpo-dong, Seocho-gu, Seoul 137-701, Korea. bclee@snu.ac.kr.
authors: Byeong Chun
authors: BC
authors: Lee
authors: Yeun-Jun
authors: YJ
authors: Chung
mesh_terms: D000483:Alleles; D000818:Animals; D065150:Cellular Reprogramming; D019976:Cloning, Organism; D055028:Comparative Genomic Hybridization; D056915:DNA Copy Number Variations; D004285:Dogs; D005260:Female; D016678:Genome; D019656:Loss of Heterozygosity; D008297:Male; D015203:Reproducibility of Results; D056916:Segmental Duplications, Genomic; D014019:Tissue Donors