The DAZL1 gene is expressed in human male and female embryonic gonads before meiosis
作者:Vera Brekhman、Josef Itskovitz-Eldor、Elena Yodko、Michael Deutsch、Judith Seligman
DOI:10.1093/molehr/6.5.465
日期:2000.5
The human DAZL1 gene (known also as DAZH or DAZLA) is the autosomal homologue of the Y-chromosomal DAZ gene which has been found to be deleted in azoospermic males. Evidence suggests that the role of DAZL1 may not be restricted to spermatogenesis, but may include oogenesis as well. In order to study the function of human DAZL1 gene in the ovary, we observed its expression pattern during embryonic development. RNA in-situ hybridization showed that DAZL1 transcripts were localized to a subset of cells (somatic versus germ cells) in human embryonic ovary (23 weeks of gestation) and testis (21 weeks gestation). In the ovary, DAZL1 transcripts were found in oogonia and in oocytes and granulosa cells of primordial follicles. In the testis, DAZL1 transcripts were identified exclusively in the germ cells. Our results demonstrate high similarity between the human DAZL1 and the mouse Dazl1 gene expression patterns during embryonic development, suggesting that the human gene functions at the first phase of gametogenesis, just as in the mouse, where Dazl1 mutations cause male and female sterility.
人类 DAZL1 基因(又称 DAZH 或 DAZLA)是 Y 染色体 DAZ 基因的常染色体同源基因,在无精子症男性中被发现缺失。有证据表明,DAZL1 的作用可能不仅限于精子发生,还包括卵子的发生。为了研究人DAZL1基因在卵巢中的功能,我们观察了它在胚胎发育过程中的表达模式。RNA 原位杂交显示,在人类胚胎卵巢(妊娠 23 周)和睾丸(妊娠 21 周)中,DAZL1 转录物定位于一部分细胞(体细胞和生殖细胞)。在卵巢中,DAZL1 转录本出现在卵原细胞、卵母细胞和原始卵泡的颗粒细胞中。在睾丸中,DAZL1转录本只在生殖细胞中被发现。我们的研究结果表明,人类DAZL1基因与小鼠Dazl1基因在胚胎发育过程中的表达模式高度相似,这表明人类基因在配子发生的第一阶段发挥作用,就像小鼠一样,Dazl1基因突变会导致雌雄不育。