The structure of DNA from the rye (Secale cereale) NOR R1 locus and its behaviour in wheat backgrounds

R. Appels, L. B. Moran, J. P. Gustafson
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引用次数: 89

Abstract

The nucleotide sequence of a 4.5-kilobase (kb) segment of rye DNA (in the clone pScR4) containing the major spacer region of ribosomal DNA, 0.25 kb of the 5′ end of the 18S gene and approximately 1.2 kb of the 3′ end of the 26S gene is presented. The 5′ end of the 18S gene, and most of the 3′ end of the 26S gene, could be readily defined by comparisons with previously published sequences. The major spacer region was dominated by the presence of 10 repeating units, with a basic length of 134 base pairs (bp), which showed sequence variability in that deletions of sections of the sequence as well as base-pair changes were common. A portion of the sequence which was common to almost all the spacer repeats and is also found in the corresponding wheat spacer repeats (in pTa250), with only two mismatches (using a consensus sequence of the rye spacer repeats as a comparison), is GCGACATGGAAAACCGGGCAAAACCACGTAC. The occurrence of this conserved sequence between more divergent sequences in both wheat and rye sugges...
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黑麦NOR R1基因座的DNA结构及其在小麦背景下的表现
黑麦DNA(克隆pScR4)中包含核糖体DNA的主要间隔区,18S基因5 '端0.25 kb和26S基因3 '端约1.2 kb的核苷酸序列。18S基因的5 '端和26S基因的大部分3 '端可以很容易地通过与先前发表的序列进行比较来定义。主要间隔区以10个重复单元为主,基本长度为134个碱基对(bp),具有序列变异特征,序列片段缺失和碱基对变化较为常见。该序列的一部分是GCGACATGGAAAACCGGGCAAAACCACGTAC,它几乎是所有间隔序列所共有的,也存在于相应的小麦间隔序列中(在pTa250中),只有两个不匹配(使用黑麦间隔序列的一致序列作为比较)。这一保守序列在小麦和黑麦中差异较大的序列之间的出现表明……
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