EVIDENCE THAT THE MECHANISM OF GENE EXCHANGE IN TRYPANOSOMA-BRUCEI INVOLVES MEIOSIS AND SYNGAMY

CMR TURNER, J STERNBERG, N BUCHANAN, E SMITH, G HIDE, A TAIT

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Abstract

All pairwise combinations of three cloned stocks of Trypanosoma brucei (STIB 247L, STIB 386AA and TREU 927/4) were co-transmitted through tsetse flies (Glossina morsitans) and screened for the production of hybrid trypanosomes. Clones of metacyclic and bloodstream trypanosomes from flies harbouring mature infections containing hybrid trypanosomes were established and screened for several isoenzyme and restriction fragment length polymorphisms. For each of the three combinations of parents, some progeny clones were observed to be of a phenotype and genotype indicating that genetic exchange had occurred during development of the trypanosomes in flies. These hybrid clones shared three salient features: (1) where the parents were homozygous varients the progeny were heterozygous, (2) where one of the parents was heterozygous, allelic segregation was observed and (3) the progeny clones were shown to be recombinant when two or more markers for which one of the parents was heterozygous were examined. These results are consistent with the progeny being an F1 in a diploid mendelian genetic system involving meiosis and syngamy. Our observations show that all possible combinations of the three stocks may undergo genetic exchange. A marker analysis of a series of clones each derived from single metacyclic trypanosomes showed that individual flies transmit a mixture of trypanosome genotypes corresponding to F1 progeny and to parental types, indicating that genetic exchange was a non-obligatory event in the life-cycle of the trypanosome. In addition, a preliminary analysis of the phenotype of procyclic stage trypanosomes derived from flies infected with two stocks, indicates that genetic exchange is unlikely to occur at this stage.

Original languageEnglish
Pages (from-to)377-386
Number of pages10
JournalParasitology
Volume101
Publication statusPublished - Dec 1990

Keywords

  • TRYPANOSOMA-BRUCEI
  • GENETIC EXCHANGE
  • MEIOSIS
  • RECOMBINATION
  • AFRICAN TRYPANOSOMES
  • CYCLICAL TRANSMISSION
  • SUBGENUS TRYPANOZOON
  • GLOSSINA-MORSITANS
  • HYBRID FORMATION
  • TSETSE FLIES
  • FREQUENCY
  • DIPLOIDY
  • FORMS
  • LINES

Cite this

TURNER, CMR., STERNBERG, J., BUCHANAN, N., SMITH, E., HIDE, G., & TAIT, A. (1990). EVIDENCE THAT THE MECHANISM OF GENE EXCHANGE IN TRYPANOSOMA-BRUCEI INVOLVES MEIOSIS AND SYNGAMY. Parasitology, 101, 377-386.

EVIDENCE THAT THE MECHANISM OF GENE EXCHANGE IN TRYPANOSOMA-BRUCEI INVOLVES MEIOSIS AND SYNGAMY. / TURNER, CMR; STERNBERG, J; BUCHANAN, N; SMITH, E; HIDE, G; TAIT, A.

In: Parasitology, Vol. 101, 12.1990, p. 377-386.

Research output: Contribution to journalArticle

TURNER, CMR, STERNBERG, J, BUCHANAN, N, SMITH, E, HIDE, G & TAIT, A 1990, 'EVIDENCE THAT THE MECHANISM OF GENE EXCHANGE IN TRYPANOSOMA-BRUCEI INVOLVES MEIOSIS AND SYNGAMY' Parasitology, vol. 101, pp. 377-386.
TURNER, CMR ; STERNBERG, J ; BUCHANAN, N ; SMITH, E ; HIDE, G ; TAIT, A. / EVIDENCE THAT THE MECHANISM OF GENE EXCHANGE IN TRYPANOSOMA-BRUCEI INVOLVES MEIOSIS AND SYNGAMY. In: Parasitology. 1990 ; Vol. 101. pp. 377-386.
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abstract = "All pairwise combinations of three cloned stocks of Trypanosoma brucei (STIB 247L, STIB 386AA and TREU 927/4) were co-transmitted through tsetse flies (Glossina morsitans) and screened for the production of hybrid trypanosomes. Clones of metacyclic and bloodstream trypanosomes from flies harbouring mature infections containing hybrid trypanosomes were established and screened for several isoenzyme and restriction fragment length polymorphisms. For each of the three combinations of parents, some progeny clones were observed to be of a phenotype and genotype indicating that genetic exchange had occurred during development of the trypanosomes in flies. These hybrid clones shared three salient features: (1) where the parents were homozygous varients the progeny were heterozygous, (2) where one of the parents was heterozygous, allelic segregation was observed and (3) the progeny clones were shown to be recombinant when two or more markers for which one of the parents was heterozygous were examined. These results are consistent with the progeny being an F1 in a diploid mendelian genetic system involving meiosis and syngamy. Our observations show that all possible combinations of the three stocks may undergo genetic exchange. A marker analysis of a series of clones each derived from single metacyclic trypanosomes showed that individual flies transmit a mixture of trypanosome genotypes corresponding to F1 progeny and to parental types, indicating that genetic exchange was a non-obligatory event in the life-cycle of the trypanosome. In addition, a preliminary analysis of the phenotype of procyclic stage trypanosomes derived from flies infected with two stocks, indicates that genetic exchange is unlikely to occur at this stage.",
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AU - TURNER, CMR

AU - STERNBERG, J

AU - BUCHANAN, N

AU - SMITH, E

AU - HIDE, G

AU - TAIT, A

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N2 - All pairwise combinations of three cloned stocks of Trypanosoma brucei (STIB 247L, STIB 386AA and TREU 927/4) were co-transmitted through tsetse flies (Glossina morsitans) and screened for the production of hybrid trypanosomes. Clones of metacyclic and bloodstream trypanosomes from flies harbouring mature infections containing hybrid trypanosomes were established and screened for several isoenzyme and restriction fragment length polymorphisms. For each of the three combinations of parents, some progeny clones were observed to be of a phenotype and genotype indicating that genetic exchange had occurred during development of the trypanosomes in flies. These hybrid clones shared three salient features: (1) where the parents were homozygous varients the progeny were heterozygous, (2) where one of the parents was heterozygous, allelic segregation was observed and (3) the progeny clones were shown to be recombinant when two or more markers for which one of the parents was heterozygous were examined. These results are consistent with the progeny being an F1 in a diploid mendelian genetic system involving meiosis and syngamy. Our observations show that all possible combinations of the three stocks may undergo genetic exchange. A marker analysis of a series of clones each derived from single metacyclic trypanosomes showed that individual flies transmit a mixture of trypanosome genotypes corresponding to F1 progeny and to parental types, indicating that genetic exchange was a non-obligatory event in the life-cycle of the trypanosome. In addition, a preliminary analysis of the phenotype of procyclic stage trypanosomes derived from flies infected with two stocks, indicates that genetic exchange is unlikely to occur at this stage.

AB - All pairwise combinations of three cloned stocks of Trypanosoma brucei (STIB 247L, STIB 386AA and TREU 927/4) were co-transmitted through tsetse flies (Glossina morsitans) and screened for the production of hybrid trypanosomes. Clones of metacyclic and bloodstream trypanosomes from flies harbouring mature infections containing hybrid trypanosomes were established and screened for several isoenzyme and restriction fragment length polymorphisms. For each of the three combinations of parents, some progeny clones were observed to be of a phenotype and genotype indicating that genetic exchange had occurred during development of the trypanosomes in flies. These hybrid clones shared three salient features: (1) where the parents were homozygous varients the progeny were heterozygous, (2) where one of the parents was heterozygous, allelic segregation was observed and (3) the progeny clones were shown to be recombinant when two or more markers for which one of the parents was heterozygous were examined. These results are consistent with the progeny being an F1 in a diploid mendelian genetic system involving meiosis and syngamy. Our observations show that all possible combinations of the three stocks may undergo genetic exchange. A marker analysis of a series of clones each derived from single metacyclic trypanosomes showed that individual flies transmit a mixture of trypanosome genotypes corresponding to F1 progeny and to parental types, indicating that genetic exchange was a non-obligatory event in the life-cycle of the trypanosome. In addition, a preliminary analysis of the phenotype of procyclic stage trypanosomes derived from flies infected with two stocks, indicates that genetic exchange is unlikely to occur at this stage.

KW - TRYPANOSOMA-BRUCEI

KW - GENETIC EXCHANGE

KW - MEIOSIS

KW - RECOMBINATION

KW - AFRICAN TRYPANOSOMES

KW - CYCLICAL TRANSMISSION

KW - SUBGENUS TRYPANOZOON

KW - GLOSSINA-MORSITANS

KW - HYBRID FORMATION

KW - TSETSE FLIES

KW - FREQUENCY

KW - DIPLOIDY

KW - FORMS

KW - LINES

M3 - Article

VL - 101

SP - 377

EP - 386

JO - Parasitology

JF - Parasitology

SN - 0031-1820

ER -