title: The methylation patterns of the IGF2 and IGF2R genes in bovine spermatozoa are not affected by flow-cytometric sex sorting.
abstract: The objectives of this study were to investigate the effect of sexing by flow cytometry on the methylation patterns of the IGF2 and IGF2R genes. Frozen-thawed, unsorted, and sex-sorted sperm samples from four Nellore bulls were used. Each ejaculate was separated into three fractions: non-sexed (NS), sexed for X-sperm (SX), and sexed for Y-sperm (SY). Sperm were isolated from the extender, cryoprotectant, and other cell types by centrifugation on a 40:70% Percoll gradient, and sperm pellets were used for genomic DNA isolation. DNA was used for analyses of the methylation patterns by bisulfite sequencing. Methylation status of the IGF2 and IGF2R genes were evaluated by sequencing 195 and 147 individual clones, respectively. No global differences in DNA methylation were found between NS, SX, and SY groups for the IGF2 (P = 0.09) or IGF2R genes (P = 0.38). Very specific methylation patterns were observed in the 25th and 26th CpG sites in the IGF2R gene. representing higher methylation in NS than in the SX and SY groups compared with the other CpG sites. Further, individual variation in methylation patterns was found among bulls. In conclusion, the sex-sorting procedure by flow cytometry did not affect the overall DNA methylation patterns of the IGF2 and IGF2R genes, although individual variation in their methylation patterns among bulls was observed.
authors: Department of Animal Science, ESALQ, University of São Paulo, Piracicaba, São Paulo, Brazil.
authors: José O
authors: JO
authors: Carvalho
authors: Valquíria A
authors: VA
authors: Michalczechen-Lacerda
authors: Roberto
authors: R
authors: Sartori
authors: Fernanda C
authors: FC
authors: Rodrigues
authors: Otávio
authors: O
authors: Bravim
authors: Maurício M
authors: MM
authors: Franco
authors: Margot A N
authors: MA
authors: Dode
mesh_terms: D000818:Animals; D002417:Cattle / Q000235:genetics / Q000378:metabolism; D019175:DNA Methylation / Q000502:physiology; D005434:Flow Cytometry / Q000379:methods / Q000662:veterinary; D020869:Gene Expression Profiling; D005786:Gene Expression Regulation; D007206:Individuality; D007335:Insulin-Like Growth Factor II / Q000235:genetics* / Q000378:metabolism; D008297:Male; D017527:Receptor, IGF Type 2 / Q000235:genetics* / Q000378:metabolism; D012743:Sex Preselection / Q000379:methods* / Q000662:veterinary; D013094:Spermatozoa / Q000378:metabolism*
chemical_list: D017527:Receptor, IGF Type 2; D007335:Insulin-Like Growth Factor II