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BACKGROUND: Thyroxine-binding globulin (TBG) is the major thyroid hormone transport protein in serum. Located on the long arm of the X chromosome, TBG (SERPINA7) gene mutations most commonly produce inherited partial TBG deficiency (TBG-PD). OBJECTIVE: We report a novel TBG variant associated with TBG-PD identified in 2 different families of Ashkenazi origin residing in greater Chicago. METHODS: Family 1: The proband was 12.6 years old when she presented for delayed puberty and was placed on L-T4. Although her serum TSH normalized, her serum T4 remained low. Affected family members had low total T4 and T3, but a normal free T4 index, even when serum TSH concentrations were normal. Family 2: A 71-year-old male presented with a history of a nonfunctioning pituitary adenoma and normal pituitary axes except for low total T4 and T3. His brother had a similar thyroid phenotype. RESULTS: Following direct DNA sequencing, both index patients were found to carry a missense mutation in the TBG gene (c.751T>G) producing p.V215G. The proposita of family 1 was heterozygous and the proband in family 2 was hemizygous for the mutation. Isoelectric focusing showed no alteration in the TBG isoforms and in vitro expression demonstrated a TBG with reduced affinity for T4. CONCLUSIONS: We report a novel mutation in the TBG gene in 2 unrelated families that produces a molecule with reduced affinity for T4 resulting in low serum T4. However, the physical properties of the mutant molecule remained unaltered as determined by isoelectric focusing.
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AIMS: To assess change in glycemic control concurrent with increased clinic visits, HbA1c testing, and education. Rates of complications were also examined. METHODS: A 1-2 year follow-up of 214 members of the Rwanda Life for a Child program (aged <26 years) with a first HbA1c between June 2009 and November 2010 was conducted. Data were analyzed for the entire cohort and by age (<18 years, ≥18 years). Trajectory analysis was performed to identify trends in HbA1c. RESULTS: Mean overall HbA1c decreased significantly from baseline (11.2 ± 2.7%; 99 ± 30 mmol/mol) to one- (10.2 ± 2.6%; 88 ± 28 mmol/mol) and two- (9.8 ± 26%; 84 ± 25 mmol/mol) year follow up visits. The prevalence of microalbuminuria did not significantly change (21.0%, 18.8%, and 19.6%), nor did nephropathy (4.7%, 7.8%, and 5.4%). However, rates of hypertension (31.8%, 44.9%, and 40.3%) were higher than expected. Five HbA1c groups were identified by trajectory analysis, and those with the worst control monitored their glucose significantly fewer times per week. CONCLUSIONS: The establishment of regular care, HbA1c testing, and increased education is associated with significant improvements in glycemic control in youth with type 1 diabetes (T1D) in sub-Saharan Africa, but the high prevalence of hypertension is of concern.
Assuntos
Glicemia/metabolismo , Diabetes Mellitus Tipo 1/terapia , Hemoglobinas Glicadas/metabolismo , Educação de Pacientes como Assunto/métodos , Atenção Primária à Saúde/métodos , Adolescente , Adulto , Glicemia/análise , Criança , Estudos de Coortes , Diabetes Mellitus Tipo 1/sangue , Diabetes Mellitus Tipo 1/complicações , Feminino , Hemoglobinas Glicadas/análise , Humanos , Hipertensão/complicações , Masculino , Prevalência , Ruanda/epidemiologia , Adulto JovemRESUMO
OBJECTIVE: We report that intractable early childhood obesity may be associated with severe insulin resistance syndromes (pseudo-Cushing's syndrome and pseudo-acromegaly) and precede polycystic ovary syndrome (PCOS). STUDY DESIGN/RESULTS: Patient 1 had prepubertal obesity followed by early puberty and was diagnosed with pseudo-Cushing's syndrome and insulin resistance at 10.3 years. Oligomenorrhea, androgen excess, and type 2 diabetes mellitus (DM2) emerged at 13.5 years. Patient 2 developed intractable prepubertal obesity followed by atypical true sexual precocity and pseudo-Cushing's syndrome in early childhood. By 11.3 years, oligomenorrhea, androgen excess, and DM2 had appeared. Patient 3 had prepubertal overgrowth in weight and height and was diagnosed with pseudo-acromegaly, menstrual irregularity, androgen excess, and impaired glucose tolerance at 14.3 years of age. Patient 4 had prepubertal overgrowth that evolved into pseudo-acromegaly, insulin resistance, secondary amenorrhea, and androgen excess at 15.6 years. CONCLUSIONS: Intractable prepubertal obesity was recognized to culminate in early childhood pseudo-Cushing's syndrome or pseudo-acromegaly, which are manifestations of insulin-resistant hyperinsulinism, and to herald adolescent PCOS.
Assuntos
Hiperinsulinismo/etiologia , Resistência à Insulina , Obesidade/complicações , Obesidade/diagnóstico , Síndrome do Ovário Policístico/etiologia , Adolescente , Criança , Síndrome de Cushing/patologia , Feminino , Humanos , Hiperinsulinismo/diagnóstico , Obesidade/patologia , Síndrome do Ovário Policístico/diagnóstico , Puberdade Precoce/patologia , Fatores de TempoRESUMO
UNLABELLED: The purpose of this pilot study was to test the hypothesis that adolescents with type 1 diabetes can learn to become better problem solvers in diabetes self-care and thereby improve their metabolic control. METHODS: Fifty-three adolescents aged 13 to 17 with type 1 diabetes were randomly assigned to either a 6-week problem-solving diabetes education program or to a control group (usual care). A1C levels were obtained as well as assessments of problem solving, frequency of behavior, level of responsibility, and 24-hour behavior recall at baseline and 6 months. RESULTS: The experimental group participants showed significantly improved problem-solving test scores and A1C values from baseline to 6 months, changes not evident in the control group. At 6 months, the experimental group participants were doing blood glucose testing more often than those in the control group. However, there was no significant difference in problem-solving test scores or A1C values. CONCLUSIONS: This 6-week intervention for adolescents with diabetes resulted in better problem-solving skills, more frequent blood glucose testing, and improved A1C values. The results suggest that a diabetes problem-solving program for adolescents can be effective in improving metabolic control.