Fetal hemoglobin in sickle cell anemia: genetic determinants of response to hydroxyurea

The increase in fetal hemoglobin (HbF) in response to hydroxyurea (HU) varies among patients with sickle cell anemia. Twenty-nine candidate genes within loci previously reported to be linked to HbF level (6q22.3–q23.2, 8q11–q12 and Xp22.2–p22.3), involved in metabolism of HU and related to erythroid...

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Veröffentlicht in:The pharmacogenomics journal 2007-12, Vol.7 (6), p.386-394
Hauptverfasser: Ma, Q, Wyszynski, D F, Farrell, J J, Kutlar, A, Farrer, L A, Baldwin, C T, Steinberg, M H
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container_issue 6
container_start_page 386
container_title The pharmacogenomics journal
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creator Ma, Q
Wyszynski, D F
Farrell, J J
Kutlar, A
Farrer, L A
Baldwin, C T
Steinberg, M H
description The increase in fetal hemoglobin (HbF) in response to hydroxyurea (HU) varies among patients with sickle cell anemia. Twenty-nine candidate genes within loci previously reported to be linked to HbF level (6q22.3–q23.2, 8q11–q12 and Xp22.2–p22.3), involved in metabolism of HU and related to erythroid progenitor proliferation were studied in 137 sickle cell anemia patients treated with HU. Three-hundred and twenty tagging single nucleotide polymorphisms (SNPs) for genotyping were selected based on HapMap data. Multiple linear regression and the nonlinear regression Random Forest method were used to investigate the association between SNPs and the change in HbF level after 2 years of treatment with HU. Both methods revealed that SNPs in genes within the 6q22.3–23.2 and 8q11–q12 linkage peaks, and also the ARG2 , FLT1 , HAO2 and NOS1 genes were associated with the HbF response to HU. Polymorphisms in genes regulating HbF expression, HU metabolism and erythroid progenitor proliferation might modulate the patient response to HU.
doi_str_mv 10.1038/sj.tpj.6500433
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Twenty-nine candidate genes within loci previously reported to be linked to HbF level (6q22.3–q23.2, 8q11–q12 and Xp22.2–p22.3), involved in metabolism of HU and related to erythroid progenitor proliferation were studied in 137 sickle cell anemia patients treated with HU. Three-hundred and twenty tagging single nucleotide polymorphisms (SNPs) for genotyping were selected based on HapMap data. Multiple linear regression and the nonlinear regression Random Forest method were used to investigate the association between SNPs and the change in HbF level after 2 years of treatment with HU. Both methods revealed that SNPs in genes within the 6q22.3–23.2 and 8q11–q12 linkage peaks, and also the ARG2 , FLT1 , HAO2 and NOS1 genes were associated with the HbF response to HU. Polymorphisms in genes regulating HbF expression, HU metabolism and erythroid progenitor proliferation might modulate the patient response to HU.</abstract><cop>London</cop><pub>Nature Publishing Group UK</pub><pmid>17299377</pmid><doi>10.1038/sj.tpj.6500433</doi><tpages>9</tpages></addata></record>
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subjects Alcohol Oxidoreductases - genetics
Anemia
Anemia, Sickle Cell - blood
Anemia, Sickle Cell - drug therapy
Anemia, Sickle Cell - genetics
Antisickling Agents - metabolism
Antisickling Agents - therapeutic use
Arginase - genetics
Biomedical and Life Sciences
Biomedicine
Biotransformation - genetics
Chromosome 6
Chromosomes, Human, Pair 6
Chromosomes, Human, Pair 8
Double-Blind Method
Erythropoiesis - genetics
Fetal Hemoglobin - metabolism
Fetuses
Gene Expression
Genotype
Genotyping
Hemoglobin
Human Genetics
Humans
Hydroxyurea
Hydroxyurea - metabolism
Hydroxyurea - therapeutic use
Linkage Disequilibrium
Metabolism
Nitric Oxide Synthase Type I - genetics
Nitric-oxide synthase
Oncology
original-article
Patients
Pharmacotherapy
Phenotype
Polymorphism, Single Nucleotide
Psychopharmacology
Severity of Illness Index
Sickle cell anemia
Sickle cell disease
Single-nucleotide polymorphism
Time Factors
Treatment Outcome
United States
Vascular Endothelial Growth Factor Receptor-1 - genetics
title Fetal hemoglobin in sickle cell anemia: genetic determinants of response to hydroxyurea
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