Abstract:SummaryTNR/11q#1 is a polymorphic trinucleotide (GCC)n repeat located within the minimal region of the 11q deletion in chronic lymphocytic leukemia (CLL). It was recently shown that certain alleles of this repeat are associated with a worse prognosis in CLL patients. To investigate the role of TNR/11q#1 variants as risk-modifying factors in leukemogenesis, we conducted a case-control study on 113 acute lymphotic leukemia (ALL) patients, 82 CLL patients and 146 healthy controls of Russian origin. Comparison of … Show more
SummaryCommon genetic variants are thought to increase the risk of chronic lymphocytic leukaemia (CLL), and case-control studies provide an approach to detect these variants. There have been multiple candidate gene studies published to date, but relatively few disease pathway studies or large genomic association studies. We summarize the results of these previous studies, as well as present results from our recent large pathway study of 9412 single nucleotide polymorphisms from 1253 immunity and inflammation genes in a study of 126 CLL cases and 484 frequency-matched controls. Several promising genes have been identified as susceptibility genes for risk of CLL across all of these association studies. However, a number of candidate gene studies have not been replicated in follow-up studies, whereas the results from disease pathway and large genomic studies have yet to be replicated in an independent sample. The challenge of future studies of this type will be overcoming study design issues, including definition of CLL, sample size limitations and multiple testing issues.Keywords: genetic association, case-control, candidate gene, disease pathway, genomic studies.Chronic lymphocytic leukaemia (CLL) is the most common adult leukaemia in the United States and, as reviewed in Goldin and Caporaso (2007), the evidence is strong that a genetic component exists in the aetiology of CLL. One commonly used approach to identify susceptibility genes is association studies. These are typically case-control studies that involve collecting a sample of well-characterized diseased individuals and a sample of appropriate controls who are representative of the underlying source population that generated the cases (Wacholder et al, 1992a,b). Multiple candidate gene studies, disease pathway studies and large genomic association studies have been undertaken to identify susceptibility genes for CLL. This article will review and highlight the recent progress that has been made, present new results from our Mayo Clinic case-control study, and outline the challenges for the future studies.
Materials and methods
Selection and searches of genetic association studies of CLLTo provide a thorough review of published genetic association studies of CLL, we searched PubMed (http://www.ncbi.nlm. nih.gov/sites/entrez/) and Medline databases. Our search strategy for PubMed used the following two searches: (i) CLL or non-Hodgkin lymphoma (NHL) and polymorphisms or single nucleotide polymorphisms (SNPs); or (ii) CLL and germline. Our search strategy for Medline included the following MeSH headings and keywords: chronic lymphocytic leukaemia, non-Hodgkin lymphoma and genetic association. Because the World Health Organization (WHO) classifies CLL and small lymphocytic leukaemia (SLL) as the same disease entity (Jaffe et al, 2001), we also included SLL as a keyword in our Medline search. We limited our search to the years 1997-2007, human studies and English language studies. The literature search was also supplemented with bibliography review of key stud...
SummaryCommon genetic variants are thought to increase the risk of chronic lymphocytic leukaemia (CLL), and case-control studies provide an approach to detect these variants. There have been multiple candidate gene studies published to date, but relatively few disease pathway studies or large genomic association studies. We summarize the results of these previous studies, as well as present results from our recent large pathway study of 9412 single nucleotide polymorphisms from 1253 immunity and inflammation genes in a study of 126 CLL cases and 484 frequency-matched controls. Several promising genes have been identified as susceptibility genes for risk of CLL across all of these association studies. However, a number of candidate gene studies have not been replicated in follow-up studies, whereas the results from disease pathway and large genomic studies have yet to be replicated in an independent sample. The challenge of future studies of this type will be overcoming study design issues, including definition of CLL, sample size limitations and multiple testing issues.Keywords: genetic association, case-control, candidate gene, disease pathway, genomic studies.Chronic lymphocytic leukaemia (CLL) is the most common adult leukaemia in the United States and, as reviewed in Goldin and Caporaso (2007), the evidence is strong that a genetic component exists in the aetiology of CLL. One commonly used approach to identify susceptibility genes is association studies. These are typically case-control studies that involve collecting a sample of well-characterized diseased individuals and a sample of appropriate controls who are representative of the underlying source population that generated the cases (Wacholder et al, 1992a,b). Multiple candidate gene studies, disease pathway studies and large genomic association studies have been undertaken to identify susceptibility genes for CLL. This article will review and highlight the recent progress that has been made, present new results from our Mayo Clinic case-control study, and outline the challenges for the future studies.
Materials and methods
Selection and searches of genetic association studies of CLLTo provide a thorough review of published genetic association studies of CLL, we searched PubMed (http://www.ncbi.nlm. nih.gov/sites/entrez/) and Medline databases. Our search strategy for PubMed used the following two searches: (i) CLL or non-Hodgkin lymphoma (NHL) and polymorphisms or single nucleotide polymorphisms (SNPs); or (ii) CLL and germline. Our search strategy for Medline included the following MeSH headings and keywords: chronic lymphocytic leukaemia, non-Hodgkin lymphoma and genetic association. Because the World Health Organization (WHO) classifies CLL and small lymphocytic leukaemia (SLL) as the same disease entity (Jaffe et al, 2001), we also included SLL as a keyword in our Medline search. We limited our search to the years 1997-2007, human studies and English language studies. The literature search was also supplemented with bibliography review of key stud...
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