Genetic Studies in the Genus Basidiobolus. I. Isozyme Variation among Isolates of Human and Natural Populations

Mycologia ◽  
1989 ◽  
Vol 81 (4) ◽  
pp. 504 ◽  
Author(s):  
Bruce J. Cochrane ◽  
Jill K. Brown ◽  
Richard P. Wain ◽  
Bienvenido G. Yangco ◽  
Diane Te Strake
Keyword(s):  
Natural Populations ◽  
Isozyme Variation ◽  
Genetic Studies

Genetic Studies in the GenusBasidiobolus.I. Isozyme Variation Among Isolates of Human and Natural Populations

Mycologia ◽  
1989 ◽  
Vol 81 (4) ◽  
pp. 504-513 ◽  
Author(s):  
Bruce J. Cochrane ◽  
Jill K. Brown ◽  
Richard P. Wain ◽  
Bienvenido G. Yangco ◽  
Diane Te Strake
Keyword(s):  
Natural Populations ◽  
Isozyme Variation ◽  
Genetic Studies

Epidemiology and genetics in the coevolution of parasites and hosts

1983 ◽  
Vol 219 (1216) ◽  
pp. 281-313 ◽  
Keyword(s):  
Genetic Diversity ◽  
Sexual Reproduction ◽  
Empirical Evidence ◽  
Population Biology ◽  
Natural Populations ◽  
Numerical Magnitude ◽  
Parasitic Infections ◽  
Genetic Studies ◽  
New Ideas ◽  
Host Parasite

Recent studies suggest that parasites (interpreted broadly to include viruses, bacteria, protozoans and helminths) may influence the numerical magnitude or geographical distribution of their host populations; most of such studies focus on the population biology and epidemiology of the host-parasite association, taking no explicit account of the genetics. Other researchers have explored the possibility that the coevolution of hosts and parasites may be responsible for much of the genetic diversity found in natural populations, and may even be the main reason for sexual reproduction; such genetic studies rarely take accurate account of the density- and frequency-dependent effects associated with the transmission and maintenance of parasitic infections. This paper aims to combine epidemiology and genetics, reviewing the way in which earlier studies fit into a wider scheme and offering some new ideas about host-parasite coevolution. One central conclusion is that ‘successful’ parasites need not necessarily evolve to be harmless: both theory and some empirical evidence (particularly from the myxoma-rabbit system) indicate that many coevolutionary paths are possible, depending on the relation between virulence and transmissibility of the parasite or pathogen.

scholarly journals The Plot Thickens: Haploid and Triploid-Like Thalli, Hybridization, and Biased Mating Type Ratios in Letharia

2021 ◽  
Vol 2 ◽  
Author(s):  
Sandra Lorena Ament-Velásquez ◽  
Veera Tuovinen ◽  
Linnea Bergström ◽  
Toby Spribille ◽  
Dan Vanderpool ◽  
...  
Keyword(s):  
Mating Type ◽  
Pure Culture ◽  
Natural Populations ◽  
Common Belief ◽  
Genetic Studies ◽  
Type Locus ◽  
Genomic Study ◽  
The Common ◽  
Mat Locus

The study of the reproductive biology of lichen fungal symbionts has been traditionally challenging due to their complex lifestyles. Against the common belief of haploidy, a recent genomic study found a triploid-like signal in Letharia. Here, we infer the genome organization and reproduction in Letharia by analyzing genomic data from a pure culture and from thalli, and performing a PCR survey of the MAT locus in natural populations. We found that the read count variation in the four Letharia specimens, including the pure culture derived from a single sexual spore of L. lupina, is consistent with haploidy. By contrast, the L. lupina read counts from a thallus' metagenome are triploid-like. Characterization of the mating-type locus revealed a conserved heterothallic configuration across the genus, along with auxiliary genes that we identified. We found that the mating-type distributions are balanced in North America for L. vulpina and L. lupina, suggesting widespread sexual reproduction, but highly skewed in Europe for L. vulpina, consistent with predominant asexuality. Taken together, we propose that Letharia fungi are heterothallic and typically haploid, and provide evidence that triploid-like individuals are hybrids between L. lupina and an unknown Letharia lineage, reconciling classic systematic and genetic studies with recent genomic observations.

scholarly journals Isozyme variation in natural populations

1971 ◽  
Vol 18 (1) ◽  
Author(s):  
M. M. Reddy ◽  
S. F.H. Threlkeld
Keyword(s):  
Natural Populations ◽  
Isozyme Variation

ISOZYME VARIATION IN NATURAL POPULATIONS OFDROSOPHILA BUZZATII

Evolution ◽  
1976 ◽  
Vol 30 (2) ◽  
pp. 213-233 ◽  
Author(s):  
J. S. F. Barker ◽  
J. C. Mulley
Keyword(s):  
Natural Populations ◽  
Isozyme Variation

scholarly journals Development of microsatellite loci and optimization of a multiplex assay for Latibulus argiolus (Hymenoptera: Ichneumonidae), the specialized parasitoid of paper wasps

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Agata Kostro-Ambroziak ◽  
Anna Siekiera ◽  
Magdalena Czajkowska ◽  
Jan J. Pomorski ◽  
Hanna Panagiotopoulou
Keyword(s):  
Microsatellite Loci ◽  
Population Genetic ◽  
Null Allele ◽  
Natural Populations ◽  
Multiplex Assay ◽  
Paper Wasps ◽  
Genetic Studies ◽  
Expected Heterozygosity ◽  
Null Allele Frequency ◽  
Polymorphic Microsatellite

Abstract Microsatellite loci are commonly used markers in population genetic studies. In this study, we present 40 novel and polymorphic microsatellite loci elaborated for the ichneumonid parasitoid Latibulus argiolus (Rossi, 1790). Reaction condition optimisation procedures allowed 14 of these loci to be co-amplified in two PCRs and loaded in two multiplex panels onto a genetic analyser. The assay was tested on 197 individuals of L. argiolus originating from ten natural populations obtained from the host nests of paper wasps. The validated loci were polymorphic with high allele numbers ranging from eight to 27 (average 17.6 alleles per locus). Both observed and expected heterozygosity values were high, ranging between 0.75 and 0.92 for HO (mean 0.83) and from 0.70 to 0.90 for HE (mean 0.85). The optimized assay showed low genotyping error rate and negligible null allele frequency. The designed multiplex panels could be successfully applied in relatedness analyses and genetic variability studies of L. argiolus populations, which would be particularly interesting considering the coevolutionary context of this species with its social host.

Isozyme Variation in Natural Populations of Drosophila buzzatii

Evolution ◽  
1976 ◽  
Vol 30 (2) ◽  
pp. 213 ◽  
Author(s):  
J. S. F. Barker ◽  
J. C. Mulley
Keyword(s):  
Natural Populations ◽  
Isozyme Variation ◽  
Drosophila Buzzatii
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