The relationship among sperm global DNA methylation, telomere length, and DNA fragmentation in varicocele: a cross-sectional study of 20 cases

Autor(es)

Santana, Viviane Paiva ^[1] ; Miranda-Furtado, Cristiana Libardi ^[1] ; Chielli Pedroso, Daiana Cristina ^[1] ; Eiras, Matheus Credendio ^{[2, 1]} ; Carneiro Vasconcelos, Maria Aparecida ^[1] ; Ramos, Ester Silveira ^[2] ; Calado, Rodrigo Tocantins ^[3] ; Ferriani, Rui Alberto ^[1] ; Esteves, Sandro Cassiano ^[4] ; dos Reis, Rosana Maria ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Ribeirao Preto Med Sch, Dept Gynecol & Obstet, 3900 Bandeirantes Ave, BR-14049900 Ribeirao Preto, SP - Brazil

^[2] Univ Sao Paulo, Ribeirao Preto Med Sch, Dept Genet, Ribeirao Preto, SP - Brazil

^[3] Univ Sao Paulo, Ribeirao Preto Med Sch, Dept Internal Med, Ribeirao Preto, SP - Brazil

^[4] Androfert Androl & Human Reprod Clin, Campinas, SP - Brazil

• Tipo de documento: Artigo de Revisão
• Fonte: SYSTEMS BIOLOGY IN REPRODUCTIVE MEDICINE; v. 65, n. 2, p. 95-104, MAR 4 2019.
• Citações Web of Science: 1

Resumo

Varicocele pathophysiology is related to increased oxidative stress, which might result in loss sperm DNA integrity as well as in genomic instability. Sperm telomere shortening and loss of global DNA methylation are the main features of genomic instability, leading to cell senescence and death, whereas sperm DNA fragmentation (SDF) characterizes the loss of chromatin integrity. We hypothesize that sperm genomic stability and DNA integrity is reduced in infertile men with moderate and large-sized varicoceles, thus being candidate markers of sperm quality in varicocele-related infertility. Here, we assessed the sperm global DNA methylation, telomere length, and SDF in men with and without clinically palpable varicoceles. While the rates of SDF and telomere length were not statistically different between varicocele patients and controls, global sperm DNA methylation seems to be lower in men with varicocele (49.7% +/- 20.7%) than controls (64.7% +/- 17.1%). A negative correlation between SDF and sperm motility and a positive correlation between sperm morphology and telomere length were observed. Our results suggest that varicocele may result in genomic instability, in particular, global DNA hypomethylation. However, a large sample size may confirm these findings. The understanding of the molecular mechanisms involved in the pathophysiology of varicocele-related infertility may help to better select candidates for varicocele repair. (AU)

• Processo FAPESP: 12/11069-9 - Polimorfismo cag do receptor de andrógenos e comprimento do telômero em pacientes com falência ovariana prematura
• Beneficiário: Cristiana Libardi Miranda Furtado
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado