Sequence diversity of serine repeat antigen gene exon II of Plasmodium falciparum in worldwide collected wild isolates.

Sequence diversity of serine repeat antigen gene exon II of Plasmodium falciparum in worldwide collected wild isolates.
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全球收集的野生分离株恶性疟原虫丝氨酸重复抗原基因外显子 II 的序列多样性。

DOI:
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发表时间:
2000
影响因子:
0.2
通讯作者:
F. Kawamoto
F. Kawamoto
中科院分区:
医学4区
文献类型:
--
作者:
Qing Liu;Marcelo U. Ferreira;Benedict T. Ndawi;Hiroshi Ohmae;I. S. Adagu;Tomohiro Morikawa;Toshihiro Horii;Shin Isomura;F. Kawamoto

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对采自东南亚、所罗门群岛、热带非洲国家和巴西等地的恶性疟原虫野外分离株进行了基因组DNA测序,分析了恶性疟原虫丝氨酸重复抗原基因外显子II的遗传多样性。在69株分离株中,与已报道的FCR3、K1和洪都拉斯-1型外显子II序列相比,在23株FCR3型、36株K1型和10株洪都拉斯-1型分离株中发现了5、9和20种新的等位基因形式。在外显子II的八聚体重复区(OR)发现了一组新的非同义替换、4个新插入和3个新缺失的八聚体单位,其中大部分聚集在一个40个残基的区域内。在OR中发现的一个八聚体“SNPVSSEP”被确认为一个新的重复单位。根据外显子II丝氨酸重复序列推测,洪都拉斯-1型等位基因可能是K1型和FCR3型之间的重组型。与已报道的21个丝氨酸残基相比,在SR的丝氨酸延伸部分重复丝氨酸残基较少或更多的K1型等位基因形式具有最大的OR变异。此外,还观察到等位基因形式的地理分布存在偏差。来自非洲和东南亚国家的分离物占新等位基因形式的大部分(29/33)。在东南亚发现了所有这三种类型的病毒,但在非洲没有发现FCR3型。两组FCR3新等位基因中的一组仅在巴西发现,另一组主要在所罗门群岛发现。
Field isolates of Plasmodium falciparum collected from endemic areas of Southeast Asia, Solomon Islands, tropical African countries and Brazil were analyzed for the genetic diversity of the exon II of serine repeat antigen gene (SERA) by sequencing of genomic DNA. Of sixty-nine isolates, as compared to the reported FCR3, K1 and Honduras-1 types of exon II sequences, 5, 9 and 20 new allelic forms were found in 23 isolates of the FCR3 type, 36 of the K1 type and 10 of the Honduras-1 type. A group of novel non-synonymous substitutions, 4 new insertions and 3 new deletions of octamer units were found in the octamer repeat region (OR) of the exon II, and most of them clustered within a 40-residues domain. An octamer "SNPVSSEP" revealed in the OR was confirmed as a new repeat unit. Based on the sequences of the serine repeat region (SR) of the exon II, the allelic forms of the Honduras-1 type were conjectured to be the recombinant forms between the K1 type and FCR3 type. The allelic forms of K1 type with less or more repeat serine residues in the serine stretch of the SR than the reported 21 serine residues had most of the variations in the OR. Moreover, a biased geographical distribution of allelic forms was observed. Isolates from African and Southeast Asian countries accounted for most of the new allelic forms (29/33). All of the three types were detected in Southeast Asia but none of the FCR3 type in Africa. One of two groups of FCR3 new allelic forms was found solely in Brazil while another was mainly in Solomon Islands.
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