Sequence analysis of full length cDNA of Schistosoma japonicum egg miracidia genes harboring signal sequence
- VernacularTitle:日本血吸虫虫卵毛蚴中带信号序列基因的全长cDNA序列分析
- Author:
Chuanxin YU
;
Xuren YIN
;
Kikuchi MIHOKO
;
Kenji HIRAYAMA
;
Yinchang ZHU
- Publication Type:Journal Article
- Keywords:
Schistosoma japonicum;
Gene clone;
Full length cDNA sequence;
Splicing model
- From:
Chinese Journal of Schistosomiasis Control
1989;0(01):-
- CountryChina
- Language:Chinese
-
Abstract:
Objective To analyze the full length cDNA sequence of Schistosoma japonicum egg miracidia genes harboring signal sequence.Methods The gene specific primers were designed and synthesized according to S.japonicum egg miracidia cDNA fragment containing signal sequence identified by signal sequence trapping method previously. The 5′and 3′ end cDNA fragments of each egg miracidia cDNA fragment harboring signal sequence were amplified by nest PCR using the first strand cDNA of S.japonicum as the template. The specific PCR fragments were cloned by TA clone method and sequenced. The full length cDNA sequence of each gene with signal sequence was constructed by comparing the cDNA sequence identified with signal sequence trapping method and the 5′ end sequence, the 3′ end sequence and deleting the overlapping fragments. The splicing model between mRNA of signal sequence and one of mature portions of S.japonicum egg miracidia gene was checked by analyzing the genomic DNA sequence structure of some genes with signal sequence. Results The 5′ and 3′ end cDNA fragments of sixteen among thirty cDNA fragment with signal sequence were amplified successfully, and their DNA sequences were determined. The full length cDNA sequences of sixteen egg miracidia genes were obtained by sequence matching and splicing. The results of deduced amino acid analysis found that the signal peptide of gene SjP4001 was the same to the one of SjP1531 and the signal peptide of gene SjP1183 was similar to the one of gene SjP3742. It confirmed that different genes could share the same or similar signal peptide. The data of S.japonicum genomic DNA sequence analysis showed that the S.japonicum could obtain its signal sequence by alternative splicing model or trans-splicing model. Conclusions The full length cDNA sequences of sixteen S.japonicum egg miracidia genes with signal sequence have been defined, it indicated that the S.japonicum egg miracidia genes could get its signal sequence by alternative splicing model or trans-splicing model was found in this study.
