Polymorphic markers suggest a gene flow of CFTR gene from sub-Saharan/Arabian and Meditteranean to Brazilian population

Article Abstract:

A study analyzes genetic cystic fibrosis transmembrane conductance regulator (CFTR) polymorphisms to estimate allele and haplotypes frequencies and measures linkage disequilibrium between markers with the CFTR gene, to trace the origin and evolution of different cystic fibrosis (CF) mutations in Brazilian populations. Results suggest that recombination events from the original haplotypes and gene flow among different ethnic groups, namely sub-Saharan and Mediterranean, result in CF mutations associated with different haplotypes by independent introductions.

Brazil, Genetic recombination, Sahara

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The influence of maternal lineages on social affiliations among humpback whales (Megaptera novaeangliae) on their feeding grounds in the southern Gulf of Maine

Article Abstract:

A hypothesis is tested that inspite of the apparent absence of close kinship bonds, the fluid associations amongst feeding whales are influenced by 'maternal lineages' as represented by mtDNA haplotypes of individual humpback whales in the Gulf of Maine. Results provide evidence for the influence of maternal lineages on social affiliations and among humpback whales on their feeding grounds.

Atlantic Ocean, Analysis, Food and nutrition, Polymerase chain reaction, Monte Carlo method, Monte Carlo methods, North Atlantic Ocean, Humpback whale

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A case study: Looking at the effects of fragmentation on genetic structure in different life history stages of old-growth mountain hemlock (Tsuga mertensiana)

Article Abstract:

Fine-scale genetic structure of mountain hemlock (Tsuga mertensiana) as inferred by variation at microsatellite loci was examined to detect the effects of fragmentation. It is hypothesized that seedling populations, which have regenerated after fragmentation, will demonstrate a loss of local genetic structure due to increased gene flow.

Canada, Environmental aspects, Hemlocks (Trees)

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