J Perinatol:母亲受教育程度影响孩子端粒长度,别让孩子输在起跑线上!

2015-12-09 QQduhq 译 MedSci原创

端粒缩短为自然现象。研究表明,机体出现心理问题和压力可加快这一进程。既往研究表明,新生儿端粒的长度各有不同,这可能由于遗传因素和一些外因(如母亲吸烟、吸毒或者怀孕期间营养缺乏)等造成。

端粒是存在于真核细胞线状染色体末端的一小段DNA-蛋白质复合体,它与端粒结合蛋白一起构成了特殊的"帽子"结构,作用是保持染色体的完整性和控制细胞分裂周期。端粒、着丝粒和复制原点是染色体保持完整和稳定的三大要素。端粒DNA是由简单的DNA高度重复序列组成,端粒酶可用于给端粒DNA加尾,DNA分子每次分裂复制,端粒就缩短一点,一旦端粒消耗殆尽,细胞将会立即激活凋亡机制,即细胞走向凋亡。所以端粒其长度反映细胞复制史及复制潜能,被称作细胞寿命的" 有丝分裂钟"。端粒长度的缩短促使民众寿命减少,并增加患糖尿病、肥胖和癌症等的风险。 


端粒缩短为自然现象。研究表明,机体出现心理问题和压力可加快这一进程。既往研究表明,新生儿端粒的长度各有不同,这可能由于遗传因素和一些外因(如母亲吸烟、吸毒或者怀孕期间营养缺乏)等造成。 

澳大利亚悉尼大学的研究人员发现,端粒长度较短的儿童于8岁前出现动脉厚度增加及早期血管疾病症状的风险增加。 

加州大学儿科副教授Janet Wojcicki博士及同事对数百名拉丁裔孩子从产前到青春期这一时期进行了随访调查。主要探究遗传、激素和环境因素导致儿童患慢性疾病的风险。 

研究小组于2012-2013年在扎克伯格旧金山综合医院的产前诊所招募了一些拉美裔母亲,并收集她们54个婴儿的脐带血样本。并对新生儿免疫细胞中端粒的长度进行了分析。然后,研究人员收集了一系列健康和社会人口资料,包括母亲的受教育程度、种族,产前体重指数(BMI)、父母年龄、孩子的性别、胎龄、出生体重、头围等信息。 

Wojcicki博士认为,结果表明,男性婴儿的端粒比女婴短5-6%,教育程度为中学的产妇所生育的婴儿端粒长度较高中毕业的产妇生育的婴儿短5-6%。此外,研究发现,端粒长度没有性别差异。这可能是因为墨西哥和中美洲的女性的基因相似。 

这是第一个表明母亲的受教育程度对孩子从出生便产生影响(在细胞水平)的研究。若孩子的母亲没有良好的受教育机会,则她们的孩子可能从一出生便输在起跑线上。

这表明,产妇的受教育程度及其重要,因为这一因素影响婴儿在宫内接受教育的机会。孩子在出生时便可能因母亲的受教育程度而处于弱势群体,由此可能形成恶性循环。那么社会需要对这些高危家庭采取辅助政策并提供更多的资源。但研究人员认为仍然需要更进一步的研究。

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    2016-10-01 feather89
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    2016-05-27 liye789132251
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    2016-01-28 1de3b290m83(暂无匿称)

    母亲的爱最重要

    0

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    2015-12-26 hixiaoluo

    好文章,值得看。

    0

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    2015-12-11 科研小旋风

    真的!

    0

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    2015-12-11 田田1746

    0

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