deregulated sex chromosome gene expression with male germ cell-specific loss of dicer1管制性染色体基因表达与男性生殖特异性dicer1的损失.pdfVIP

deregulated sex chromosome gene expression with male germ cell-specific loss of dicer1管制性染色体基因表达与男性生殖特异性dicer1的损失.pdf

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deregulated sex chromosome gene expression with male germ cell-specific loss of dicer1管制性染色体基因表达与男性生殖特异性dicer1的损失

Deregulated Sex Chromosome Gene Expression with Male Germ Cell-Specific Loss of Dicer1 1 . 1.¤ 1 1 1 Anne R. Greenlee * , Meng-Shin Shiao , Elizabeth Snyder , F. William Buaas , Tongjun Gu , 1 1 2 3 1 Timothy M. Stearns , Manju Sharma , Elizabeth P. Murchison , Gabriella C. Puente , Robert E. Braun 1The Jackson Laboratory, Bar Harbor, Maine, United States of America, 2 Wellcome Trust Sanger Institute, Hinxton, United Kingdom, 3 Yale University, New Haven, Connecticut, United States of America Abstract MicroRNAs (miRNAs) are a class of endogenous, non-coding RNAs that mediate post-transcriptional gene silencing by inhibiting mRNA translation and promoting mRNA decay. DICER1, an RNase III endonuclease encoded by Dicer1, is required for processing short 21–22 nucleotide miRNAs from longer double-stranded RNA precursors. Here, we investigate the loss of Dicer1 in mouse postnatal male germ cells to determine how disruptions in the miRNA biogenesis pathway may contribute to infertility. Reduced levels of Dicer1 transcripts and DICER1 were confirmed in germ cell knock-out (GCKO) testes by postnatal day 18 (P18). Compared to wild-type (WT) at 8 weeks, GCKO males had no change in body weight; yet showed significant reductions in testis mass and sperm number. Histology and fertility tests confirmed spermatogenic failure in GCKO males. Array analyses at P18 showed that in comparison to WT testes, 75% of miRNA genes and 37% of protein coding genes were differentially expressed in GCKO testes. Among these, 96% of

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