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Human Genetics Studies in Areas of High Natural Radiation: I. Methodology 1

Published online by Cambridge University Press:  01 August 2014

Ademar Freire-Maia
Ademar Freire-Maia*
Affiliation:
Laboratório de Genética Humana da Universidade Federal do Paraná, Brazil
*
Departamento de Genética, Faculdade de Ciências Médicas e Biológicas, Botucatú, Est. São Paulo, Brasil

Summary

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This paper reviews the investigations in the field of the effect of natural radiations on human populations, and discusses a number of problems inherent to retrospective genetic studies of human populations living under high levels of natural radiation. The solutions to face, at least partly, such problems are presented and discussed with special reference to the Brazilian “Projeta Espírito Santo” (PES).

In summary, the main PES subjects presented and discussed are as follows:

1) The data, including about 7000 couples and 40000 pregnancy terminations, have been fully collected and are presently under analysis. They were gathered from January to October 1961 by a team of specially-trained female interviewers employing a standard questionnaire, making home visitations, and being directly supervised by the present author;

2) The reporting has been practically consistent both within and between populations throughout the whole field work. Biased contribution both from the interviewers and the informants was probably negligible. The collection of the data was not subject to any subjective factor related to problems of radiation effect.

3) The interviewers came from the same socio-economic level from which the majority of the people interviewed belong. They were rather familiar with the region and had a perfect understanding of the culture of the people.

4) A checking survey was performed to estimate the reliability of the data, with good results.

5) No propaganda or publicity has been made preceding or during the field work. This reduced the probability that people and the field work team knew o our interest in radiation problems.

6) Although efforts were made to have good descriptions of the abnormalities, and good information on the causes of deaths, unfortunately accurate diagnosis was not possible.

7) Cultural and religious practices probably do not affect differently reproduction in the radioactive and control areas, and socio-economic conditions seem to be roughly similar.

8) It is difficult to know the cumulative radiation dose to the parents of the individuals analyzed (an attempt regarding this point will be made when the data are analyzed). The mean individuals living in the control, intermediate and radioactive areas are probably subject to minimal gonad-doses of about 2, 3, and 7 r in a 30-year period, respectively.

9) No attempt was made to study the influence of radiation on the rate of mutation at specific loci, but an analysis will be made of the genetic characteristics of the populations assumed to be conditioned or influenced by mutations at many loci.

10) As has been duly pointed out in this paper, the “Projeto Espírito Santo” (PES) was not specifically planned to demonstrate, with conclusive results, the genetic effect of natural radiation. Although some positive result is possible, it is highly improbable.

Type
Research Article
Information
Acta geneticae medicae et gemellologiae: twin research , Volume 18 , Issue 2 , April 1969 , pp. 175 - 212
Copyright
Copyright © The International Society for Twin Studies 1969

Footnotes

1

The preliminary draft of this paper has been presented at the Meeting of Investigators in the Field of Studies in Areas of High Natural Radiation, a meeting sponsored by the World Health Organization (WHO), the Brazilian Academy of Sciences, and the University of Brazil (Rio de Janeiro, December 12-15, 1961).

The “Projeto Espírito Santo”, the main subject of this paper, has been sponsored by the National Nuclear Energy Commission of Brazil, which provided a fellowship to the present author, as well as by the Special Service of Public Health Foundation (Brazil) and the Department of Health of the State of Espírito Santo (Brazil). The field work has been performed under the supervision of the Committee on Human Genetics of the Brazilian Society of Genetics.

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