Y染色体毒性不会导致长寿的性别差异
Rénald Delanoue1, Charlène Clot2, Chloé Leray2
1Institut de Biologie Valrose, Université Côte d'Azur, CNRS, INSERM, Nice, France. renald.delanoue@univ-cotedazur.fr.
Nature ecology & evolution
|June 12, 2023
概括
这是Y染色体.
科学领域:
- 遗传学 遗传学 是一个
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 发展生物学 发展生物学
背景情况:
- 性染色体在大小和组成上不同于自体,通常含有重复的DNA.
- Y染色体表现出结构上的差异,但它们的功能意义,特别是关于异染色体的意义,尚未完全理解.
- 以前的研究表明,Y染色体异染色体可能会影响男性特有的特征,如长寿,但实验证据有限.
研究的目的:
- 在体细胞中研究Y染色体异染色素在体细胞中的作用.
- 为了确定Y染色体异性染色素水平是否会影响基因沉默和生理性性别差异,包括寿命.
- 测试关于XY个体寿命缩短的"有毒Y"假设.
主要方法:
- 使用Drosophila melanogaster作为一个模型生物.
- 使用CRISPR-Cas9.9生成了一个Y染色体库,具有不同的异性染色体水平.
- 评估了Y染色体异染色体对基因沉默和寿命的影响.
主要成果:
- 增加的Y染色体异性染色体通过隔离异性染色体机械部件来破坏转基因沉默.
- 由Y染色体引起的全基因组异染色质破坏的程度与长寿的生理性性别差异无关.
- 性别之间的寿命差异是由表型性别决定的,而不是Y染色体的存在.
结论:
- Y染色体的异染色素含量可以干扰全基因组的基因沉默.
- "有毒Y"假设被驳斥;Y染色体本身并没有减少XY个体的寿命.
- 现型性,而不是Y染色体本身,驱动性别特异的寿命差异.
相关概念视频
02:32X and Y Chromosomes
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Among mammals, the gender of an organism is determined by the sex chromosomes. Humans have two sex chromosomes, X and Y. Every human diploid cell has 22 pairs of autosomes and one pair of sex chromosomes. A human female has two X chromosomes, while a male has one X chromosome and one Y chromosome.
The germline cells such as egg and sperm cells carry only half the number of chromosomes, i.e., 22 autosomes and one sex chromosome. All eggs have an X chromosome, while sperm cells can carry an X or...
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The Y chromosome is a sex chromosome found in several vertebrates and mammals, including humans. In addition to 22 pairs of autosomes, the human males have one X chromosome and one Y chromosome. In these organisms, the presence or absence of the Y chromosome determines the development of male traits.
Evolution
Around 300 million years ago, the two sex chromosomes diverged from two identical autosomal chromosomes. Over time, the Y chromosome has lost most of its genes, shrinking in size....
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01:43Sex-linked Disorders
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Like autosomes, sex chromosomes contain a variety of genes necessary for normal body function. When a mutation in one of these genes results in biological deficits, the disorder is considered sex-linked.
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02:50Dosage Compensation
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In addition to sexual development, the X chromosome has genes involved in autosomal functions such as brain development and the immune system. Therefore, males and females with distinct numbers of X chromosomes will...
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Overview
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