유전체 시대에 반수체 육종의 재발견
Rediscovery of haploid breeding in the genomics era
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초록
DNA 염기서열 분석기술의 진보는 많은 근본적인 생명현상을 이해하는데 기여해왔다. 유례없는 저비용에 염기서열을 대량으로 분석을 할 수 있게 되어 단일 규모의 실험실에서도 관심이 있는 종의 신규유전체를 해독할 수 있다. 게다가 유전집단의 전체 염기서열을 편향되지 않은채 분석하여 무수한 분자마커를 발굴할 수 있게 됨에 따라 집단유전학 연구도 두드러지게 가속화되어 왔다. 그러나 식물의 유전체가 이형접합성, 반복염기서열, 배수성과 같은 복잡한 특성이 있다는 것을 고려해 볼 때 기술이 매우 빠르게 진화함에 따라 적절한 개체 혹은 집단을확보하는 것이 식물 연구에서 주요한 문제가 되었다. 이러한 난제는 오래되었지만 매우 효율적인 기술인 반수체육성을 통하여 극복될 수 있을 것이다. 정상적인 개체가갖는 염색체의 절반을 보유하는 반수체 식물은 주로 자방이나 화분과 같은 배우체 세포를 배양함으로써 빠르게구축될 수 있다. 뒤이은 반수체 식물의 염색체 배수화는완벽한 동형접합성을 보이는 안정된 배가반수체를 만든다. 본 논문에서는 반수체 식물을 육성하고 판별하기 위한 고전적인 방법론을 요약할 것이다. 게다가 동원체의히스톤을 후성적으로 조절함으로써 반수체를 유도하는방법을 설명할 것이다. 마지막으로, 유전체 시대에 반수체 식물의 활용 방안을 유전체 해독과 집단 유전학의 측면에서 논의할 것이다.
Abstract
Advances in DNA sequencing technologies have contributed to revolutionary understanding of many fundamental biological processes. With unprecedented cost-effective and high-throughput sequencing, a single laboratory can afford to de novo sequence the whole genome for species of interest. In addition, population genetic studies have been remarkably accelerated by numerous molecular markers identified from unbiased genome-wide sequences of population samples. As sequencing technologies have evolved very rapidly, acquiring appropriate individual plants or populations is a major bottleneck in plant research considering the complex nature of plant genome, such as heterozygosity, repetitiveness, and polyploidy. This challenge could be overcome by the old but effective method known as haploid induction. Haploid plants containing half of their sporophytic chromosomes can be rapidly generated mainly by culturing gametophytic cells such as ovules or pollens. Subsequent chromosome doubling in haploid plants can generate stable doubled haploid (DH) with perfect homozygosity. Here, classical methodology to generate and identify haploid plants or DH are summarized. In addition, haploid induction by epigenetic regulation of centromeric histone is explained. Furthermore, the utilization of haploid plant in the genomics era is discussed in the aspect of genome sequencing project and population genetic studies.
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