所以通过比较这两种双胞胎的自闭症罹患率，使研究者得以对遗传因素和相同外部环境因素的影响做出比较。

So comparing autism rates in both types of twins can enable researchers to measure the importance of genes versus Shared environment.

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群组研究和遗传研究得到了相同的结论，即低同型半胱氨酸水平是一种保护性因素，尽管可能误差不同。

The cohort studies and genetic studies yielded similar results, indicating a protective effect from lower homocysteine levels, even though they did not share the same sources of possible error.

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在自闭症群体中，遗传因素导致的占相当一部分。基因突变引发的孤独症、合并癫痫和智力发育迟缓有很多相同的共病基因。

Genetic etiology play a part of role in ASD, and genes mutated causing autism and epileptic encephalopathy and mental retardation have an overlap.

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