Mitochondrial DNA Transmission Genetics in Crickets
AUTOR(ES)
Rand, David M.
RESUMO
This paper presents the results of a single generation study of the transmission genetics of mitochondrial DNA in the field cricket Gryllus firmus. In this species, individuals heteroplasmic for at least two different-sized mitochondrial genomes can be collected easily from natural populations. The frequencies of mtDNA size variants in heteroplasmic females and samples of their offspring were estimated by densitometry of autoradiographs. The variance in mitochondrial genotype frequencies among the offspring of heteroplasmic females indicates that, through genetic drift, fixation would take several hundred animal generations. Differences between the observations and data on mtDNA transmission in yeast and cows are discussed in light of the differences in organelle sampling regime and early developmental events in these species. Our data also show shifts in genotype frequencies in the transmission from mother to offspring that suggest a bias in favor of smaller genomes. The nature of mtDNA size variation in natural populations of crickets is discussed in reference to a mutation-selection balance.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1203023Documentos Relacionados
- Molecular Population Genetics of Mtdna Size Variation in Crickets
- Incomplete Maternal Transmission of Mitochondrial DNA in Drosophila
- Sex-Limited Mitochondrial DNA Transmission in the Marine Mussel Mytilus Edulis
- Male Transmission of Linear Plasmids and Mitochondrial DNA in the Fungus Neurospora
- Conflict between nuclear and mitochondrial DNA phylogenies of a recent species radiation: What mtDNA reveals and conceals about modes of speciation in Hawaiian crickets