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用于测定和区分丸的DMRT1变体的表征

Yuki Kimura, Miki Okuno, Luisa Matiz-Ceron

Cytogenetic and genome research

|September 2, 2025

概括

雌性性决定涉及早期女性基因表达 (RSPO1) 之前的男性DMRT1,具有可能影响丸发育的特定物种DMRT1变异. 这突显了鸟类的性别差异化机制.

科学领域:

鸟类生物学
发育生物学
遗传学

背景情况:

在鸟类中DMRT1是一个关键的男性性别决定基因,在 (Neognathae) 中得到了很好的研究.
猫头 (Palaeognathae) 的性别染色体差异较小,为研究鸟类的性别确定提供了一个独特的模型.
有限的分子研究存在以确定驼的性别.

研究的目的:

调查驼的性别确定时间.
分析驼中关键性腺区分基因的表达.
在驼中描述DMRT1基因变异.

主要方法:

通过解剖比较分阶段的阴道分化.
通过mRNA-seq和RT-PCR对七个关键基因 (DMRT1,AMH,SOX9,NR5A1,FOXL2,CYP19A1,RSPO1) 的基因表达进行分析.
在分析和3' RACE中用于DMRT1拼接和替代多化 (APA) 变种.

主要成果:

在汉堡 - 汉密尔顿阶段 HH25-28 之间观察到淋巴细胞分化.
基因表达模式与不同;RSPO1在雌性中表达高 (HH24-25) 在雄性DMRT1表达之前 (HH28-29).
确定了三种DMRT1拼接变种和四种APA变种,其中1种变种占主导地位.

结论:

猫头的性别差异化与Neognathae有着相同的机制,但具有不同的特征.
在DMRT1介导的丸测定之前,女性早期的RSPO1表达可能会启动卵巢分化.
特定于EMU的DMRT1变异表明在丸发育中具有特定的物种作用.

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