Neurogenin3 delineates the earliest stages of spermatogenesis in the mouse testis

Shosei Yoshida, Ayumi Takakura, Kazuyuki Ohbo, Kuniya Abe, Junko Wakabayashi, Masayuki Yamamoto, Toshio Suda, Yo Ichi Nabeshima

研究成果: Article

202 被引用数 (Scopus)

抄録

In mammalian testis, a typical stem cell system ensures continuous spermatozoa production. Lines of experiments have demonstrated that stem cell activity resides in the most primitive small subset of germ cells, that is, As (Asingle), Apr (Apaired), and Aal (Aaligned) spermatogonia, also collectively called undifferentiated spermatogonia. However, their cellular or molecular nature is largely to be elucidated because a gene that is specifically expressed in these cells has not yet been identified, which makes it difficult to study them. In this study, we demonstrate that a class B basic helix-loop-helix (bHLH) transcription factor neurogenin3 (ngn3) is expressed specifically in A s, Apr, and Aal spermatogonia because ngn3 is expressed in c-Kit negative spermatogonia throughout the seminiferous cycle, and transgenic labeling with GFP revealed connection of 1, 2, 4, 8, 16, or 32 ngn3-positive cells via intercellular bridges. ngn3 is first expressed at the prepubertal stage in c-Kit negative prespermatogonia. Lineage tracing, using the Cre-loxP system, demonstrates that ngn3-positive germ cells give rise to eventually all the spermatogenesis in mature testis. To our knowledge, ngn3 is the first reported gene that delineates these earliest stages of spermatogenesis. Considering its molecular nature, ngn3 could be involved in their differentiation control. Moreover, visualization with GFP and targeting expression of exogenous genes are valuable tools to investigate the mammalian spermatogenic stem cell system.

本文言語English
ページ(範囲)447-458
ページ数12
ジャーナルDevelopmental Biology
269
2
DOI
出版ステータスPublished - 2004 5 15

ASJC Scopus subject areas

  • Developmental Biology

フィンガープリント 「Neurogenin3 delineates the earliest stages of spermatogenesis in the mouse testis」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル