Genetic diseases of metabolism caused by a mutation in specific genes for specific proteins, be they enzymes, carriers, membrane components, or intracellular materials.
A group of inherited disorders of metabolism, many of which are associated with mental retardation. Inborn errors of metabolism usually involve deficiencies of enzymes needed to carry out an important chemical reaction. In most cases, affected infants appear normal at birth, but over time their development slows and symptoms emerge. These may include behavioral disorders, mental retardation, and muscular abnormalities. Inborn errors of metabolism vary in their symptoms and severity.
Any inherited metabolic disease caused by the absence or deficiency of specific enzymes necessary to the metabolism of basic substances such as amino acids, carbohydrates, vitamins, or essential trace elements.
Inherited metabolic disorders result from genetic mutations in a single gene, disrupting the normal activity of an enzyme. While some of these defects are benign, others are of a gravity that can result in mortality or significant physical and cognitive impairment. Instances of such disorders include Tay-Sachs disease, phenylketonuria, Hurler’s syndrome, and Lesch-Nyhan syndrome.
Signs of these conditions typically manifest either during or shortly after birth. They can involve unexplained ailments, failure to grow as expected, delayed development, limpness, consistent vomiting, or seizures.
Newborn infants undergo routine screenings for certain genetic disorders, like phenylketonuria.
In certain cases of inherited metabolic disorders, treatment might not be necessary. However, for others, steering clear of specific environmental triggers, such as certain foods, might be adequate. Occasionally, the deficient enzyme or its corresponding protein can be synthesized utilizing genetic engineering methods, or a vitamin supplement could aid in offsetting the malfunctioning enzyme. If the enzyme is produced in blood cells, a bone marrow transplant could offer a potential remedy.
Individuals who have a child or a near relative impacted by such conditions might want to contemplate undergoing genetic counseling before making arrangements for a subsequent pregnancy.