Pediatric Medical Genetics - S.I. Smiian 2003

General Principles of Medical Genetics
Subject and Tasks of Medical Genetics

Medical genetics investigates the Patterns of inheritance and trait Variability in relation to human pathology, specifically: the causes of hereditary human diseases, their inheritance patterns within families, distribution across populations, and specific CELLULAR AND MOLECULAR processes. A distinct branch is clinical genetics, which explores the Pathogenesis, Clinical presentation, Diagnostics, Prevention, and Treatment of inherited disorders.

Based on the relative role of HEREDITY AND ENVIRONMENT, all human diseases can be divided into 3 major groups:

1. Diseases entirely determined by the genotype, regardless of environmental factors (chromosomal and single-Gene disorders).

2. Diseases caused by a complex interaction of genetic and environmental factors (chronic internal organ disorders, malignant tumors, cardiovascular diseases).

3. Diseases whose onset depends entirely on external factors (acute infections, injuries, poisonings).

The primary objectives of medical genetics include studying Hereditary diseases and syndromes, as well as The Role of heredity and environment in The Development of non-hereditary pathologies, along with the development and resolution of novel biomedical challenges—such as Introduction/32.html">Genetic Engineering, which creates Methods for treating hereditary diseases through transgenesis (i.e., transferring normal METABOLISM genes into patient Cells).

Medical genetics studies hereditary variability—chromosomal and Gene Mutations—identifying the conditions of their occurrence, biochemical essence, and manifestation at the cellular and organ levels. Of significant clinical importance is the prevention of Mutagenic Factors, such as chemicals, radiation, and physical agents. These factors affect the Germ Cells of healthy individuals during their formation and induce genetic damage, or mutations. Importantly, these mutations manifest not in the individuals exposed to the harmful agent, but in their offspring as hereditary diseases and developmental malformations.

Over the past decade, genetics has made monumental strides forward. Thanks to scientific breakthroughs and refinements in genetic Research Methods, it is now possible to analyze DNA in body Tissues and identify an individual or their familial Lineage. In the near future, analyzing the genetic material of every newborn child will not only enable the prediction of hereditary pathologies but also anticipate genetic predispositions to so-called non-hereditary diseases, allowing medicine to shift its primary focus from treatment to prevention.