涨知识:聊聊人类的嵌合体胚胎发育

2016-12-30 佚名 醉心科学

几年前,网络上盛传着一个让人费斯所思的故事。国外有一对夫妻费劲辛苦造人无果之后,终于决定求助于科学的力量,在医院的帮助下,利用“试管婴儿”的技术(是指将卵子和精子都拿到体外来,在体外人工控制的环境中完成受精过程,然后把早期胚胎移植到女性的子宫中,在子宫中孕育成为孩子,这种利用体外受精技术产生的婴儿被称为试管婴儿),成功获得了一个健康可爱的宝宝。然而意想不到的,宝宝的血型与夫妻二人的血型完全对不上!

几年前,网络上盛传着一个让人费斯所思的故事。国外有一对夫妻费劲辛苦造人无果之后,终于决定求助于科学的力量,在医院的帮助下,利用“试管婴儿”的技术(是指将卵子和精子都拿到体外来,在体外人工控制的环境中完成受精过程,然后把早期胚胎移植到女性的子宫中,在子宫中孕育成为孩子,这种利用体外受精技术产生的婴儿被称为试管婴儿),成功获得了一个健康可爱的宝宝。
然而意想不到的,宝宝的血型与夫妻二人的血型完全对不上!

那么问题来了,为什么会出现这样的结果?这孩子会不会不是两人亲生的?

于是这对夫妻带着孩子去做了亲子鉴定,果然,孩子的母亲是妻子无误,可是父亲却另有其人!
既然这个宝宝是由试管婴儿技术获得的,那么有没有可能是当时的医院弄错了精子来源?于是夫妻二人寻找了律师,准备向医院讨要一个说法!

哼,总有一些刁民想要害朕!

然而医院坚决表示,那是不可能的,因为这对夫妻是那天来做试管婴儿的唯一一对白人夫妻,而你们的宝宝也是白人,我们并没有其他的白人精子...

正当事情陷入僵局的时候,一位斯坦福大学的教授建议他们去一家基因测试公司再次进行检测,这家公司更加神奇,他们不仅能进行亲子鉴定,还可以更深入的进行亲缘分析。

然而鉴定的结果却更加出乎意料,这个宝宝确实不是爸爸亲生的,生父竟然是他的同胞弟弟。

可是爸爸表示,作为独生子女长大的我根本没有兄弟姐妹好吗!蓝瘦香菇...
其实这个爸爸是一个双人嵌合体,既在受精过程中,如果两个精子分别使两个卵细胞受精,且在后续的发育过程中,这两个受精卵发生了融合,那么这个融合后的胚胎就会发育成一个嵌合体。该类型嵌合体又叫做“四配子嵌合体(Tetragametic chimerism)”,主要发生在胚胎发育的早期。

简单来说,在胚胎时期,这个爸爸还有一个双胞胎兄弟的存在,但随着孕育过程的进行,较弱一方的胚胎逐步被较强一方吞噬并整合,最终形成一个嵌合体胚胎,随着个体的发育,体内就存在具有两套DNA系统,而被吞噬掉的“兄弟”恰好整合到了这个爸爸的生殖系统当中,也就出现了上述的状况。

经过进一步的检测也正是,尽管爸爸的皮肤DNA与宝宝不符,但是与精子DNA是相符的,所以在生理上,宝宝是他消失的双胞胎兄弟的孩子。
在全球范围内被报道出来的病例只有不超过100例,这些少有的案例被报道,都恰好是因为器官移植,或者恰好嵌合在生殖系统当中,而有科学家表示,这样的嵌合体并不罕见,有1/8的人都有可能嵌合体,只不过嵌合的部位没有人注意到,比如内脏,或者肌肉,又或者也不是经常有人会去做亲子鉴定的... 

在当时,事情到这里也基本结束了,这个爸爸在当时吞噬掉了自己的双胞胎兄弟,而他却无法将自己的基因传递下去,所以在这场进化的战争中,究竟是谁取得了优势呢?

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    2020-09-09 ms4000000278133438

    了解了这个知识,以后有了孩子做亲子鉴定,假如跟父亲不符跟母亲相符先别急着下结论,要进一步检测一下精子基因和胎儿基因来确定是不是父子关系,要不可能*枉妻子。

    0

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    2017-06-17 millore
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    2017-01-01 ailian1202
  4. [GetPortalCommentsPageByObjectIdResponse(id=883765, encodeId=092e883e6559, content=了解了这个知识,以后有了孩子做亲子鉴定,假如跟父亲不符跟母亲相符先别急着下结论,要进一步检测一下精子基因和胎儿基因来确定是不是父子关系,要不可能*枉妻子。, beContent=null, objectType=article, channel=null, level=null, likeNumber=66, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=df0f5416792, createdName=ms4000000278133438, createdTime=Wed Sep 09 02:21:11 CST 2020, time=2020-09-09, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=2079629, encodeId=189320e962905, content=<a href='/topic/show?id=ec074e823ea' target=_blank style='color:#2F92EE;'>#嵌合体#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=36, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=47823, encryptionId=ec074e823ea, topicName=嵌合体)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=c0e3195, createdName=millore, createdTime=Sat Jun 17 07:53:00 CST 2017, time=2017-06-17, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1315323, encodeId=be0d13153236e, content=<a href='/topic/show?id=6fcc83e0554' target=_blank style='color:#2F92EE;'>#胚胎#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=41, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=83705, encryptionId=6fcc83e0554, topicName=胚胎)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=6393434, createdName=ailian1202, createdTime=Sun Jan 01 05:53:00 CST 2017, time=2017-01-01, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1347136, encodeId=ad92134e13647, content=<a href='/topic/show?id=88713e938c1' target=_blank style='color:#2F92EE;'>#发育#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=32, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=37938, encryptionId=88713e938c1, topicName=发育)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=f4c124, createdName=neurowu, createdTime=Sun Jan 01 05:53:00 CST 2017, time=2017-01-01, status=1, ipAttribution=)]
    2017-01-01 neurowu