Recombination within a subclass of restriction fragment length polymorphisms may help link classical and molecular genetics.

Recombination within a subclass of restriction fragment length polymorphisms may help link classical and molecular genetics.
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限制性片段长度多态性子类内的重组可能有助于将经典遗传学和分子遗传学联系起来。

DOI:
10.1093/genetics/120.3.809
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发表时间:
1988
期刊:
影响因子:
3.3
通讯作者:
Arnold,J
Arnold,J
中科院分区:
生物学2区
文献类型:
--
作者:
Meagher,RB;McLean,MD;Arnold,J

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限制性片段长度多态性(RFLP)被用于构建许多真核生物基因组的完整连锁图谱。这些RFLP图谱可用于预测重要表型基因座的遗传,并将有助于影响科学、医学和农学重要表型的连锁基因的分子克隆。然而,遗传连锁几乎不意味着基因座之间的实际物理距离。描述了一种测定法,其使用遗传重组体来测量从DNA探针到连锁的表型基因座的物理距离。我们已经定义的子集的所有RFLP的多态性限制性位点的两端作为II类RFLP。II类RFLP的频率计算作为一个功能的序列分歧和总RFLP频率高度分歧的基因组。DNA序列差异超过7%的生物体之间存在有用的频率。II类RFLP内的扩增将产生新大小的片段,其可通过脉冲场电泳测定以估计连锁RFLP和表型基因座之间的内切酶对中的物理距离。这种拟议的测定应具有特殊的应用,作物高度分歧和多态性的物种往往是遗传相容的,因此,II类RFLP将是最常见的。
Restriction fragment length polymorphisms (RFLPs) are being used to construct complete linkage maps for many eukaryotic genomes. These RFLP maps can be used to predict the inheritance of important phenotypic loci and will assist in the molecular cloning of linked gene(s) which affect phenotypes of scientific, medical and agronomic importance. However, genetic linkage implies very little about the actual physical distances between loci. An assay is described which uses genetic recombinants to measure physical distance from a DNA probe to linked phenotypic loci. We have defined the subset of all RFLPs which have polymorphic restriction sites at both ends as class II RFLPs. The frequency of class II RFLPs is computed as a function of sequence divergence and total RFLP frequency for highly divergent genomes. Useful frequencies exist between organisms which differ by more than 7% in DNA sequence. Recombination within class II RFLPs will produce fragments of novel sizes which can be assayed by pulsed field electrophoresis to estimate physical distance in kilobase pairs between linked RFLP and phenotypic loci. This proposed assay should have particular applications to crop plants where highly divergent and polymorphic species are often genetically compatible and thus, where class II RFLPs will be most frequent.
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