Christos S. Bartsocas

Virus Antibody Survey in Different European Populations Indicates Risk Association Between Coxsackievirus B1 and Type 1 Diabetes

Enteroviruses (EVs) have been connected to type 1 diabetes in various studies. The current study evaluates the association between specific EV subtypes and type 1 diabetes by measuring type-specific antibodies against the group B coxsackieviruses (CVBs), which have been linked to diabetes in previous surveys. Altogether, 249 children with newly diagnosed type 1 diabetes and 249 control children matched according to sampling time, sex, age, and country were recruited in Finland, Sweden, England, France, and Greece between 2001 and 2005 (mean age 9 years; 55% male). Antibodies against CVB1 were more frequent among diabetic children than among control children (odds ratio 1.7 [95% CI 1.0–2.9]), whereas other CVB types did not differ between the groups. CVB1-associated risk was not related to HLA genotype, age, or sex. Finnish children had a lower frequency of CVB antibodies than children in other countries. The results support previous studies that suggested an association between CVBs and type 1 diabetes, highlighting the possible role of CVB1 as a diabetogenic virus type.

X-Linked Form of Myopia

A Greek family is described in which myopia seemingly follows an X-linked pattern of inheritance. This observation supports the existence of an X-linked form of myopia, disputed until now.

Genetic screening for individuals at high risk for type 1 diabetes in the general population using HLA Class II alleles as disease markers. A comparison between three European populations with variable rates of disease incidence

To develop screening strategies for identification of individuals at increased genetic risk for type 1 diabetes in three populations with variable disease incidence rates and distinct ethnic origin.

An Insulin Infusion Advisory System for Type 1 Diabetes Patients based on Non-Linear Model Predictive Control Methods

In this paper, an Insulin Infusion Advisory System (IIAS) for Type 1 diabetes patients, which use insulin pumps for the Continuous Subcutaneous Insulin Infusion (CSII) is presented. The purpose of the system is to estimate the appropriate insulin infusion rates. The system is based on a Non-Linear Model Predictive Controller (NMPQ which uses a hybrid model. The model comprises a Compartmental Model (CM), which simulates the absorption of the glucose to the blood due to meal intakes, and a Neural Network (NN), which simulates the glucose-insulin kinetics. The NN is a Recurrent NN (RNN) trained with the Real Time Recurrent Learning (RTRL) algorithm. The output of the model consists of short term glucose predictions and provides input to the NMPC, in order for the latter to estimate the optimum insulin infusion rates. For the development and the evaluation of the HAS, data generated from a Mathematical Model (MM) of a Type 1 diabetes patient have been used. The proposed control strategy is evaluated at multiple meal disturbances, various noise levels and additional time delays. The results indicate that the implemented HAS is capable of handling multiple meals, which correspond to realistic meal profiles, large noise levels and time delays.

Growth and growth hormone therapy in children with achondroplasia: A two‐year experience

The efficacy and safety of recombinant human growth hormone (hGH) administration was studied in children with achondroplasia. Fifteen children with achondroplasia, seven boys (4.8-12.2 years of age) and 12 girls (5.7-2.2 years of age), were treated daily with hGH at a dosage of 1 IU/kg/week. Auxological assessments were performed 6 months before, at initiation of, and at 6, 12, and 24 months following initiation of growth hormone (GH) therapy. Before initiating GH therapy, hypothalamic-pituitary and thyroid functions were evaluated. Levels of serum insulin-like growth factor (IGF)-I and IGF binding protein (BP)-3 (IGFBP-3) were assessed, as was GH response to provocative stimuli. GH responses in two stimulation tests were normal for all but three children. During the first semester of GH treatment, a significant increase in height velocity (HV), from 3.2 to 8.3 cm/year, was observed in all children. However, during the second semester, a relative decrease in growth rate was observed. By the end of the first year, HV had increased from 3.2 to 6.9 cm/year (mean, 3.7 cm/year; range, 1.1-8 cm/year) in 13 children and remained unchanged in two children. HV declined progressively during the next 12 months and, by the end of the second year of treatment, had increased in seven of the nine children who had completed 2 years of therapy (mean increase, 3.1 cm/year); two children did not respond to GH therapy, as shown by the lack of increase in HV. Sitting-height (SH) to standing-height ratio % (SH%) remained unchanged throughout GH therapy, and no significant change in skeletal maturation was observed. In conclusion, hGH treatment resulted in an increased growth rate in some children with achondroplasia; however, this increase waned during the second year of treatment. Children with the lowest pretreatment HVs seemed to benefit most from GH therapy. Nonetheless, the usefulness of GH treatment in achondroplasia will be known only when a study of final height is completed.

Genetic structure of the Greek gypsies

Data are presented on several polymorphic genetic markers in 200 Greek gypsies. Polymorphic loci studied were: the ABO, MN, Rhesus, Kell and Duffy blood groups, hemoglobin, and ceruloplasmin. A survey for congenital malformations and hereditary diseases was also carried out on this group. The ABO, Rhesus, MN and Duffy system frequencies varied significantly from the figures obtained for the Greek population. However, there is a characteristic similarity between various gypsy groups studied in other nations and the distribution of polymorphic traits in the Punjab region of India. Cystic fibrosis, renal tubular acidosis, 21‐hydroxylase deficiency, Holt‐Oram syndrome and homozygous (3‐tha‐lassemia were diagnosed within the gypsy group studied.

Taste Sensitivity to Phenylthiocarbamide in the Salamis Island Population (Greece)

A study of a population sample of the island of Salamis for the ability to taste phenylthiocarbamide showed that 71.4% of the males and 65.9% of the females were tasters, with an average figure of 67.8%.

Oligomenorrhoea in adolescents with type 1 diabetes mellitus: relationship to glycaemic control

OBJECTIVE To investigate oligomenorrhoea in adolescents with type 1 diabetes and the possible relationship with glycaemic control. STUDY DESIGN The study group consisted of 81 female adolescents with type 1 diabetes whose mean age was 15.0 years (range 12-18). The control group consisted of 205 healthy adolescents with a mean age of 15.5 years (range 12-18). Data on menstruation were collected by two parallel self-administered questionnaires. Oligomenorrhoea was defined as having a menstrual cycle longer than 36 days throughout the past year (5-6/year). The metabolic control of diabetes was evaluated by calculating the mean value of HbA1c during the past year. RESULTS Age of menarche was greater for adolescents with type 1 diabetes (12.2 ± 1.4 vs. 11.7 ± 1.2, p < 0.000) compared to healthy age-matched controls. Logistic regression analysis with oligomenorrhoea as the dependent binary variable revealed an odds ratio equal to 7.8 (95% CI 3.411-17.853) for adolescents with type 1 diabetes (p < 0.000). Finally, a second logistic regression analysis, concerning only adolescents with type 1 diabetes and with the same binary variable, estimated an odds ratio of 4.8 (95% CI 1.784-13.057, p < 0.002) for HbA1c, and an odds ratio of 5.3 (95% CI 1.821-15.130, p < 0.002) for the frequency of hypoglycaemia. CONCLUSION In adolescents with type 1 diabetes, menarche occurs later and oligomenorrhoea is more frequent. The relative risk of having oligomenorrhoea is greater when there is an increased value of HbA1c or when hypoglycaemia is more frequent.

Developmental Aspects of Amino Acid Transport

L -Lysine-14C uptake was studied in vitro in intestinal segments of rats, in various ages, ranging between 15-day fetuses and adults. L -Lysine in 0.065

Nutritional implications of chronic dyspepsia in childhood.

Chronic dyspepsia is common in children. However, the association of individual predominant symptoms with gastric emptying and their impact on nutritional status are poorly defined. We therefore studied 31 children (mean age 11 years, 14 boys) with chronic dyspepsia and classified their predominant symptoms (PS) by their character and severity. Gastric emptying (GE) T1/2 of a solid meal was carried out in all patients, while upper gastrointestinal endoscopy was done in the treatment failures. All patients received two months treatment with cisapride. Weight for age z scores were recorded before and three months after treatment. There were 12 patients with epigastric pain (EP) as the PS (7 moderate/severe). Postprandial fullness (PF) was the PS in 19 patients (12 moderate/severe). GE T1/2 was prolonged and weight for age z scores were lower in children who had moderate/severe (but not mild) PF comparing to those who had EP (P < 0.0001 and P = 0.003, respectively). A significant improvement in weight was observed in the same group alone following treatment with cisapride (P = 0.0003). In conclusion, impaired GE is common in dyspeptic children with PF and have adverse effects on nutritional status.