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Biomedical subjects

J Lindsten

Publications and source records attributed to J Lindsten.

At least 19 recordsLinked to original sources
PubMed1992

Maternal smoking and irradiation during pregnancy as risk factors for child leukemia.

The effect of joint exposure to diagnostic X-rays and maternal smoking during pregnancy was compared in a case-control study of 216 children with cancer (128 cases with acute lymphoblastic leukemia [ALL] and 88 with solid tumors) and 301 control children with insulin-dependent diabetes mellitus (IDDM). Exposure to diagnostic X-rays combined with smoking of ten or more cigarettes per day gave a relative risk of 3.6 (95% CI, 1.8 to 7.0) and a positive dose response relation for ALL in the offspring (p less than 0.001). When examined alone, X-rays gave a relative risk of 1.8 (95% CI, 1.1 to 3.1), and smoking a relative risk of 2.2 (95% CI, 1.1 to 4.5). No similar trend was seen for solid tumors. Potential confounding was examined after stratification on maternal smoking-diagnostic X-ray exposure and each of potential confounders, but there was little change in the risk ratio. We conclude that the risk of ALL in the offspring was more than threefold higher when smoking was combined with diagnostic X-ray during pregnancy.

Adolescent↗
PubMed1979

Unusual XX/XY chimerism.

Apparently identical twin boys are both XX/XY and have two populations, A1 and B, of cells in their peripheral blood. Chimerism in somatic tissue outside the blood cells can be demonstrated in only one of the twins. From analysis of chromosomes and many gene markers the mechanism of origin of the unusual twins remains unclear.

ABO Blood-Group System↗
PubMed1978

An early behavioral description of a person with Turner's syndrome.

A person with Turner's syndrome was described by Dr. Charles Pears in the Philosophical Transactions of the Royal Society, London, in 1805. The description included behavioral traits of mild temperament, absence of heterosexual interests, and concern about social stigmatization. These traits are the object of current behavior genetic studies of persons with Turner's syndrome.

England↗
PubMed1977

Chromosome aberrations and sister-chromatid exchange in workers in chemical laboratories and a rotoprinting factory and in children of women laboratory workers.

Cultured lymphocytes from 73 workers in chemical laboratories and the printing industry were found to have a significantly increased frequency of chromatid and isochromatid breaks, in comparison with 49 control subjects (42 adults and 7 children). An increase of the same magnitude was also found in 14 children, aged 4 days--11 yr, of 11 women laboratory workers who had worked during pregnancy. A significant correlation between age and frequency of chromosome aberrations was noted for both the exposed and control children but not for the adults. The frequency of sister-chromomatid exchange was significantly increased in 12 technicians working in laboratories performing hormone analysis. 4 children of 2 female technicians working during pregnancy also had a significnatly increased frequency of sister-chromatid exchange. The cause and biological significance of these findings are not yet known.

Adolescent↗
PubMed1977

Carcinoembryonic antigen in amniotic fluid.

Carcinoembryonic antigen (CEA), a substance which is known to occur in high amounts in the fetal gut and also in certain tumors of the gastrointestinal tract, has been demonstrated in amniotic fluids from different stages of pregnancy. Radioimmunoassays of CEA in amniotic fluids of 91 normal pregnancies showed a decrease from a mean of 53 ng/ml at 19 weeks to 25 ng/ml at the end of gestation. The CEA activity in amniotic fluid was eluted in the same volume as a standard 125I-CEA on a Sephadex G200 column. Amniotic fluid therefore contains CEA similar in molecular weight to the CEA purified from liver metastases of colonic cancer. Among 17 cases of abnormal pregnancies, CEA elevations were observed in five with anomalous fetuses.

Amniotic Fluid↗
PubMed1977

A chiasma map of man.

By fitting compounds beta distributions to chiasma frequencies the physical map obtained from banded chromosomes has been converted into a chiasma map giving the distribution of observed chiasmata in relation to several hundred cytological bands, assuming proportionality of mitotic and meiotic chromosomes. This is a genetic map if there is a precise correspondence between sites of chiasmata and crossing-over. However, if there is appreciable preanaphase movement of chasmata, then the chiasma map is a serious distortion of the genetic map. Predictions from the chiasma map can be confirmed or refuted only by genetic evidence for which the estimates of this paper serve as initial values to begin maximum likelihood iteration.

Chromosome Mapping↗
PubMed1977

A mapping function for man.

Assuming a perfect correspondence between the site of crossing-over and an observed chiasma, data on meiosis in the human male are used to estimate a mapping parameter which on average turns out to be intermediate between the Kosambi and Carter-Falconer values, but smaller for acrocentrics. A table is given for converting recombination frequencies to map distances.

Chromosome Mapping↗
PubMed1976

Molecular forms and activities of glycosidases in cultures of amniotic-fluid cells.

Ion-exchange chromatography of gel filtration demonstrated the presence of different molecular forms of nine lysosomal enzymes in cultured amniotic-fluid cells. The patterns of molecular forms were similar to those known from skin fibroblasts and liver tissue. During cultivation total enzyme activities fluctuated with the number of passages, without any consistent trend of increase or decrease, and without correlation to the dominating cell type in the culture.

Acetylglucosaminidase↗
PubMed1976

Significance of genetic factors for the plasma insulin response to glucose in healthy subjects.

The intravenous glucose tolerance and plasma insulin response to glucose infusion were analysed in a twin and family material, comprising 279 healthy subjects. The relation between the blood glucose and plasma insulin values was studied by an analysis of the principal eigenvalues. The variables obtained were corrected for sex, age and weight, and standardized with regard to mean and variance. The results showed that at least four of the variables have appreciable familial correlations, corresponding to a heritability (h2) varying between 0.38 and 0.72. These correlations could not be accounted for by common environment alone. Thus, the beta cell function in normal man, as measured by a glucose challenge test, appears to be genetically regulated.

Adolescent↗