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61.
  • Gottlieb, Bruce, et al. (författare)
  • Making Sense of Intratumor Genetic Heterogeneity : Altered Frequency of Androgen Receptor CAG Repeat Length Variants in Breast Cancer Tissues
  • 2013
  • Ingår i: Human Mutation. - : Hindawi Limited. - 1059-7794 .- 1098-1004. ; 34:4, s. 610-618
  • Tidskriftsartikel (refereegranskat)abstract
    • To examine the significance of intratumor genetic heterogeneity (ITGH) of the androgen receptor (AR) gene in breast cancer, patient-matched samples of laser capture microdissected breast tumor cells, adjacent normal breast epithelia cells, and peripheral blood leukocytes were sequenced using a novel next generation sequencing protocol. This protocol measured the frequency of distribution of a variable AR CAG repeat length, a functional polymorphism associated with breast cancer risk. All samples exhibited some degree of ITGH with up to 30 CAG repeat length variants identified. Each type of tissue exhibited a different distribution profile of CAG repeat lengths with substantial differences in the frequencies of zero and 1825 CAG AR variants. Tissue differences in the frequency of ARs with each of these CAG repeat lengths were significant as measured by paired, twin t-tests. These results suggest that preferential selection of 1825 CAG repeat length variants in breast tumors may be associated with breast cancer, and support the observation that shorter CAG repeats may protect against breast cancer. They also suggest that merely identifying variant genes will be insufficient to determine the critical mutational events of oncogenesis, which will require measuring the frequency of distribution of mutations within cancerous and matching normal tissues.
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63.
  • Grahn, Ammi, 1961, et al. (författare)
  • Determination of Lewis FUT3 gene mutations by PCR using sequence-specific primers enables efficient genotyping of clinical samples.
  • 2001
  • Ingår i: Human mutation. - : Hindawi Limited. - 1098-1004 .- 1059-7794. ; 18:4, s. 358-9
  • Tidskriftsartikel (refereegranskat)abstract
    • We have developed a polymerase chain reaction method using sequence-specific primers (PCR-SSP) for rapid and correct genotyping of the common Lewis (FUT3) gene mutations 59T>G, 202T>C, 314C>T, 508G>A, and 1067T>A. The PCR-SSP method was validated on 20 healthy blood donors and 16 non-insulin-dependent diabetic patients. All individuals were in parallel genotyped by our established polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) analysis. The FUT3 genotypes, determined with the PCR-SSP method, were in complete accordance with the results of the PCR-RFLP reference method. The PCR-SSP method could also be adapted to assign the presence of a specific mutation to the respective FUT3 alleles. We found the method to be reliable, rapid and cheap with no requirements for restriction enzyme processing.
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68.
  • Harnevik, Lotta, et al. (författare)
  • Identification of 12 novel mutations in the SLC3A1 gene in Swedish cystinuria patients
  • 2001
  • Ingår i: Human Mutation. - : Hindawi Limited. - 1059-7794 .- 1098-1004. ; 18:6, s. 516-525
  • Tidskriftsartikel (refereegranskat)abstract
    • Cystinuria is an autosomal recessive disorder that affects luminal transport of cystine and dibasic amino acids in the kidneys and the small intestine. Three subtypes of cystinuria can be defined biochemically, and the classical form (type I) has been associated with mutations in the amino acid transporter gene SLC3A1. The mutations detected in SLC3A1 tend to be population specific and have not been previously investigated in Sweden. We have screened the entire coding sequence and the intron/exon boundaries of the SLC3A1 gene in 53 cystinuria patients by means of single strand conformation polymorphism (SSCP) and DNA sequencing. We identified 12 novel mutations (a 2 bp deletion, one splice site mutation, and 10 missense mutations) and detected another three mutations that were previously reported. Five polymorphisms were also identified, four of which were formerly described. The most frequent mutation in this study was the previously reported M467T and it was also detected in the normal population with an allelic frequency of 0.5%. Thirty-seven patients were homozygous for mutations in the SLC3A1 gene and another seven were heterozygous which implies that other genes may be involved in cystinuria. Future investigation of the non-type I cystinuria gene SLC7A9 may complement our results but recent studies also suggest the presence of other potential disease genes.
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