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Generating Genetically Modified Plasmodium berghei Sporozoites

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Mutations Increasing Asexual Plasmodium Formation in PHYSARUM POLYCEPHALUM.

P N Adler¹, C E Holt

¹Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139.

|November 1, 1977

Summary

This study identified mutations affecting plasmodium formation in amoebae, revealing temperature and mating-type allele influences. Two mutant groups, GAD and ALC, exhibit altered asexual differentiation and life cycles, respectively.

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Area of Science:

Cell Biology
Genetics
Developmental Biology

Background:

Plasmodium formation is a critical developmental process in heterothallic amoebae.
Understanding mutations affecting this process is key to deciphering developmental pathways.

Purpose of the Study:

To identify and characterize mutations that influence plasmodium formation in heterothallic amoebae.
To investigate the effects of temperature and mating-type alleles on mutation frequency and expression.

Main Methods:

Analysis of rare plasmodia formed in clones of heterothallic amoebae.
Genetic analysis of identified mutant strains.
Phenotypic analysis of mutant spores and resulting amoebae under varying temperatures.

Main Results:

Mutation frequency varied significantly with temperature and mating-type allele.
Two distinct mutant classes were identified: GAD (greater asexual differentiation) and ALC (amoebaless life cycle).
GAD mutants showed increased asexual plasmodium formation, with some mutations linked to mating-type and others unlinked; temperature sensitivity varied.
ALC mutants bypassed the amoebal phase, with some mutations unlinked to mating-type and exhibiting complex inheritance patterns.

Conclusions:

Environmental factors like temperature and genetic background (mating-type alleles) critically influence mutation rates and phenotypes.
Discovered mutations provide insights into the genetic regulation of asexual differentiation and life cycle progression in amoebae.
Unlinked mutations (gad-12, alc-1) suggest complex genetic interactions and potential regulatory networks controlling plasmodium formation.