Owing to the large size of the APC gene, responsible for familial adenomatous polyposis, direct screening for individual mutations is not a practical approach. In the present study we establish the methodology of fluorescence based semi-automated DNA analysis to perform presymptomatic diagnosis of members at risk from 11 Portuguese FAP families with three (CA)n markers flanking the APC gene, MB...

Drainage systems of the Great Plains and western Gulf Slope underwent substantial changes through diversions and stream captures during the Pleistocene, either as the result of the glacial advances or through independent geologic processes. The distributions of a variety of fishes that range across west-central North America, such as the plains killifish (Fundulus zebrinus), are thought to be t...

Some genetic studies have shown a linkage between malignant hyperthermia susceptibility (MHS) and chromosome 19q or the skeletal muscle ryanodine receptor (RYR1) gene. Some types of MHS seem to be caused by an abnormality of calcium-induced calcium release (CICR). We analyzed the linkage of RYR1 gene polymorphisms in Japanese MHS families and investigated the correlation between genetic evidenc...

Ardinger et al. (1989) hypothesized that there might be a nonrandom association between clefting and RFLPs of candidate genes which have a role in palate formation. They reported a significant association between two RFLPs of transforming growth-factor alpha (TGFa) and clefting in a group of 80 patients with nonsyndromic cleft lip with or without cleft palate (CLIP) and in a group of 102 contro...

Single nucleotide polymorphisms (SNPs) are among the most common types of polymorphism used for genetic association studies. A method to allow the accurate quantitation of their allele frequencies from DNA pools would both increase throughput and decrease costs for large-scale genotyping. However, to date, most DNA pooling studies have concentrated on the use of microsatellite polymorphisms. In...

Restriction fragment length polymorphisms (RFLPs) of EcoRI-and ClaI-digested chloroplast DNA (cpDNA) within the genus Glycine subgenus Soja were characterized. Two mutations were found to be responsible for the EcoRI and ClaI restriction site polymorphisms, and both were located in a region in which many ribosomal protein genes are clustered. This region is within the large single copy region o...

The rapid development of molecular techniques offers a palette of technical approaches for population biologists interested in a wide range of questions. For example, these tools can be used to determine individual reproductive success or to measure rates of genetic divergence among populations. Which technique is most appropriate for a particular question depends upon (1) the extent of genetic...

While compiling genetic linkage maps in several plant species based upon restriction fragment length polymorphisms (RFLPs), it was noted that the incidence of polymorphism differs among species. The basis of this disparity was investigated in this study by examining the nucleotide sequence at homologous loci among distinct cultivars within two species which exhibit considerably different levels...