Polymorphisms near a chromosome 6q QTL area are associated with modulation of fetal hemoglobin levels in sickle cell anemia

In patients with sickle cell anemia, fetal hemoglobin (HbF) concentrations vary by 2 orders of magnitude. This variance may be a result of heterogeneity in gene regulatory elements; accordingly, we searched for single nucleotide polymorphisms (SNPs) that might identify this variation. More than 180 SNPs were studied in 38 genes in 280 sickle cell anemia patients. The strongest association with HbF was found with SNPs near a QTL previously localized on chromosome 6q22.3-q23.2. Initially, two SNPs were identified in intergenic portions of this QTL and were associated with about a 20% difference in percent HbF. Subsequently, we genotyped 44 additional SNPs in the genomic region between 136.1 Mb and 137.5 Mb on chromosome 6q. Twelve SNPs, associated with a 20%-30% difference in HbF concentrations, were located in the introns of four genes, PDE7B, MAP7, MAP3K5 and PEX7. In K562 cells, the p38-MAPK pathway has been associated with the activation of gamma-globin gene expression by histone deacetylase inhibitors. Haplotypes C-T-T-T in MAP7 and T-C-C in PEX7 were significantly associated with increases in concentration of HbF, both showing strong dominance. Genetic elements abutting the 6q22.3-q23.2 QTL, may harbor trans-acting elements that help modulate baseline HbF level in sickle cell anemia.

The "Boston model" of managed care and spinal cord injury: a cross-sectional study of the outcomes of risk-based, prepaid, managed care

OBJECTIVE

To present preliminary data on the health-related consequences for people with spinal cord injury (SCI) of participation in a prepaid, risk-based, managed care plan.

DESIGN

Baseline data from a longitudinal interview survey.

SETTING

Massachusetts.

PARTICIPANTS

Subjects were 114 independently living adults with SCI recruited from 6 independent living centers and 2 managed care plans; 45 received care from a risk-based prepaid managed care plan and 69 from other sources.

MAIN OUTCOMES

Self-reports of use of health services; self-assessments of health, health at interview versus 12 months earlier; hospital admissions; numbers of secondary conditions, and experiences of specific secondary conditions (eg, pressure ulcers, depression, fatigue, and chronic pain).

RESULTS

Persons in the managed care plan do not differ from their counterparts in terms of age, gender, education, level of SCI, number of comorbid conditions, activity of daily living profiles, household composition, and reliance upon health maintenance programs and routines (eg, bowel and bladder care). In terms of processes of care, they appear generally better-served. There also are a few differences in outcome that are statistically significant, or approach significance, and generally favor the managed care plan.

CONCLUSION

Preliminary data suggest that thoughtfully and sensitively designed and implemented risk-based managed care may improve both access and outcomes.