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[Introduction to Genetic/Rare Disease and the Application of Genetic Counseling].

Genetic disease or hereditary disease is a group of disorders that is caused by mutations in an individual's genome. The mutated genome or gene may be transmitted through the germ line during reproduction, causing certain recurrence risk in offspring and other family members. The heritability of these disorders is thus an important issue to deal with clinically. In Taiwan, a rare disease is defined as a disease that is prevalent in fewer than 1 in 10,000 individuals. As up to 80% of rare disease cases in Taiwan are genetic disease disorders, genetic disease may not rare. The pathophysiology of genetic/ rare disease is very complicated. Individual disorders may have their own unique mechanisms (such as Fragile X syndrome), with most of these mechanisms still unclear or unknown. The symptoms and signs of genetic/rare disease thus present the greatest variabilities and cause difficulties in making diagnoses. Most related patients may present multiple congenital anomalies, metabolic disorders, growth and developmental delays, defects in cognition, neuromuscular abnormalities, and defects in vision, hearing or other organ functions. Symptomatic and supportive treatment still comprise a major component of treatment of genetic/rare disease (with the exception of special formulae for several inborn errors of metabolic disease and enzyme replacement therapy in some lysosomal storage disease). Poor self-care ability is common and the burden on caregivers is huge. Most rare disease patients are treated using a comprehensive rehabilitation program that begins during very early childhood, receive individual educational programs, and are continuously monitored with regard to their growth, developmental, and nutritional status. Inter-professional patient care, genetic counseling, and the creation of family support networks play an important role in family management. Public awareness and the creation of appropriate social systems and resources allocation are mandatory for proper care. The incidence of each genetic/rare disease is rare, but collectively they are important public health issue and a challenge to medical care.

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