人之初，性本善。這句說話在現今科學上究竟站不站著腳呢?644Please respect copyright.ＰＥＮＡＮＡecoeujoZT2
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(圖2)我們腦部有一隻蛋白酶名為Monoamine oxidase A (MAOA)，它的功用是分解多巴胺(Dopamine)及血清素(Serotonin)，防止這些物質過量聚集在腦部，避免神經線因這些物質過量聚集而影響正常運作。644Please respect copyright.ＰＥＮＡＮＡePp3qBSITv
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另一方面來看，若MAOA蛋白酶過量產生在大腦裡頭的話，人們便會因血清素過低而陷入抑鬱症狀，因此早期亦有抗抑鬱藥物的設計是抑制MAOA的運作，盡量減少血清素的分解。644Please respect copyright.ＰＥＮＡＮＡk8Koyx4t5y
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(圖3)研究發現，無論人類、老鼠及馬騮，若MAOA基因出現先天性的變異，因而導致腦部的MAOA蛋白酶數量偏少的話，腦部相關的神經物質過量類累積，導致暴力舉動及情緒激動等負面傾向的出現，醫學界命名此疾病為Brunner syndrome，病人較大傾向會犯下縱火、暴力及性罪行。644Please respect copyright.ＰＥＮＡＮＡ6AV8uqHK8I
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而基於這MAOA的基因是位於X染色體裡，男性(只有一條X染色體)出現此病的機率會高於女性(擁有兩條X染色體)，這是因為兩條X染色體同時出現變異的機率比一條X染色體出現變異較低。644Please respect copyright.ＰＥＮＡＮＡpo6NaMblQb
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雖則後天教育對個人發展有著極為深厚的影響，但在先天性MAOA基因變異的前提下，有一部份人一出生便已經不是性本善了。644Please respect copyright.ＰＥＮＡＮＡtSTKrFb79O
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如果想我快啲出文的話，請入去Penana網站科普專欄–薯不揀單俾一個like以及Bookmark，這對我非常之重要。644Please respect copyright.ＰＥＮＡＮＡPAsQT2LxLY
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同時亦可以在Penana網站裡按「買一嚿/半嚿薯仔」，以課金的方式推動我繼續搜羅資料寫文，多謝。644Please respect copyright.ＰＥＮＡＮＡVf7t3GyEX9
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Link:644Please respect copyright.ＰＥＮＡＮＡrQaajQrvBt
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio644Please respect copyright.ＰＥＮＡＮＡCJoeQGWijS
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Ref1:https://science.sciencemag.org/content/304/5672/818.1.full644Please respect copyright.ＰＥＮＡＮＡIhiwvmjWuc
Ref2:https://science.sciencemag.org/content/sci/262/5133/578.full.pdf
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