Self-organizing map approaches for the haplotype assembly problem

Self-organizing map approaches for the haplotype assembly problem
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单倍型组装问题的自组织图谱方法

DOI:
10.1016/j.matcom.2009.01.021
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发表时间:
2009-06
影响因子:
4.6
通讯作者:
Li, Zhenping
Li, Zhenping
中科院分区:
数学3区
文献类型:
--
作者:
Chen, Luonan;Wu, Ling-Yun;Wang, Rui-Sheng;Zhang, Xiang-Sun;Li, Zhenping

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单倍型组装是根据在一组单个DNA片段中观察到的SNP值重建一对单倍型。本文重点研究了单倍型组装问题的最小误差修正(MEC)模型,并对该问题的自组织映射(SOM)方法进行了探索。具体地说,MEC的单倍型组装被描述为一个整数线性规划模型。由于MEC问题是NP-Hard问题,因此不能在大规模实例可接受的运行时间内精确求解,因此我们利用MEC模型研究了经典SOM解决单倍型组装问题的能力。然后,针对经典SOM的局限性,提出了一种新的SOM方法。在合成数据集和真实数据集上的大量计算实验表明,新的基于SOM的算法在真实参数设置下能够以非常高的精度高效地重建单倍型对。与以往方法的比较也证实了新的自组织映射方法的优越性能。
Haplotype assembly is to reconstruct a pair of haplotypes from SNP values observed in a set of individual DNA fragments. In this paper, we focus on studying minimum error correction (MEC) model for the haplotype assembly problem and explore self-organizing map (SOM) methods for this problem. Specifically, haplotype assembly by MEC is formulated into an integer linear programming model. Since the MEC problem is NP-hard and thus cannot be solved exactly within acceptable running time for large-scale instances, we investigate the ability of classical SOMs to solve the haplotype assembly problem with MEC model. Then, aiming to overcome the limits of classical SOMs, a novel SOM approach is proposed for the problem. Extensive computational experiments on both synthesized and real datasets show that the new SOM-based algorithm can efficiently reconstruct haplotype pairs in a very high accuracy under realistic parameter settings. Comparison with previous methods also confirms the superior performance of the new SOM approach.
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