Galactosemia is a hereditary metabolic disorder associated with impaired metabolism of galactose, sucrose, and lactose in the body. In this disorder, one of the enzymes involved in galactose metabolism is absent or insufficiently active, most often galactose-1-phosphate uridyltransferase. As a result of the accumulation of galactose and its derivatives, in particular galactose-1-phosphate, toxic changes occur, leading to damage to organs and systems, especially the central nervous system, liver, and kidneys. The main clinical manifestations include jaundice, vomiting, diarrhea, growth and developmental disorders, as well as the risk of serious molecular and morphological changes in the body if the disease is not diagnosed and treated in time.
History of the disease and interesting historical facts
Galactosemia was first described in 1908, when doctors learned of its association with severe metabolic disorders. In the following decades, research in genetics and biochemistry allowed us to establish the precise mechanisms of the disease. In 1956, the first mutation associated with galactosemia was isolated, which was an important step in understanding its pathogenesis. Interestingly, in the 1970s, mass screening of newborns for this disease began, which significantly increased the speed of its diagnosis and the possibility of early intervention. By this time, scientific research had shown that early diagnosis and adherence to a lactose-free diet significantly improve the prognosis for children with galactosemia.
Epidemiology
Galactosemia is a rare disorder, with an incidence of approximately 1 in 30,000 live births. However, prevalence may vary by ethnicity; for example, people of European descent have a higher incidence than other races. In settings of high inbreeding, such as in some closed populations, the incidence may be as high as 1 in 3,000. It is estimated that approximately 50% cases go undetected or misdiagnosed during the first few months of life.
Genetic predisposition to this disease
Galactosemia is inherited in an autosomal recessive manner, meaning that two copies of a mutant gene located on chromosome 9 at location q22.3 are required for the disease to manifest. The main gene involved is GALT (galactose-1-phosphate uridyltransferase). To date, more than 200 different mutations in this gene have been identified, and each of them can affect the enzyme activity in different ways. In addition to mutations in the GALT gene, defects in other genes responsible for galactose metabolism have also been described, but they are much less common.
Risk factors for the development of this disease
Galactosemia is a hereditary disease, so the main risk factors are related to genetic predisposition. These include:
- Family history of galactosemia.
- The presence of other autosomal recessive diseases in the family.
- Taking into account ethnicity (increased risk in people of European descent).
- Insufficient attention to symptoms in early childhood and lack of newborn screening.
Environmental factors do not influence the development of galactosemia, as this condition is the result of genetic mutations, but early diagnosis and timely intervention can improve the prognosis of the disease.
Diagnosis of this disease
Diagnosis of galactosemia begins with a clinical examination and assessment of symptoms associated with the disease. The main symptoms are:
- Jaundice in newborns.
- Vomiting and diarrhea after introducing formula.
- Apathy and lack of reaction to the environment.
- Delayed growth and development.
- Hepatomegaly (enlarged liver).
Laboratory tests play a key role in diagnosis:
- Determination of the level of galactose and galactose-1-phosphate in the blood.
- Biochemical analysis for the presence of a defect in galactose-1-phosphate uridyltransferase activity.
Radiological examinations such as abdominal ultrasound may be used to evaluate the liver and other organs. It is important to differentiate from other metabolic diseases such as Fabry disease and glucose-galactose malabsorption to avoid misdiagnosis and prescriptions.
Treatment
The main principle of galactosemia treatment is strict adherence to a lactose-free diet throughout life. This prevents the accumulation of galactose and its derivatives, which leads to an improvement in the patient's condition. Pharmacological treatment may include vitamin supplements and special formulas for children based on soy milk or other alternatives to fish and dairy products.
In some cases, surgery is necessary to correct the effects of liver damage or other complications resulting from the accumulation of toxic substances. Monitoring of the patient's condition includes regular check-ups with doctors, as well as repeated tests for galactose levels and liver function.
Additional treatment strategies may include:
- Supportive therapy to relieve digestive difficulties.
- Consultations with nutritionists to create individual diet plans.
- Psychological support to help patients adapt to their condition.
List of medications used to treat this disease
There are currently no specific medications for the treatment of galactosemia. The focus is on special diet and supportive care. One possible form of preparation includes:
- Special formulas for feeding with low galactose content.
- Vitamin preparations to improve metabolic processes.
In addition, it is recommended to conduct regular monitoring of health indicators.
Disease monitoring
Monitoring of the condition of patients with galactosemia is carried out at several levels:
- Regular blood tests for galactose and its metabolites.
- Monitoring the growth and development of children.
- Evaluation of the condition of the liver and other organs using ultrasound and other diagnostic methods.
The prognosis for patients following the diet is generally good; however, without proper monitoring, severe complications may develop, including liver cirrhosis and neurological disorders.
Age-related features of the disease
Galactosemia may manifest itself at different ages, and its course varies in neonates, children, and adults. In the neonatal period, the disease may produce acute symptoms requiring immediate intervention. In older children and adolescents, symptoms may be less pronounced, but even small delays in diagnosis and dietary control can lead to long-term consequences. In adult patients, where the disease was diagnosed late or not fully controlled, progression of chronic liver disease and psychoneurological disorders may be observed.
Questions and Answers
- What are the main signs of galactosemia in newborns? One of the main signs is jaundice, vomiting after feeding and hepatomegaly.
- Can galactosemia be cured? Galactosemia cannot be cured, but symptoms can be successfully controlled by following a strict lactose-free diet.
- How important is early diagnosis of diseases? Early diagnosis plays a critical role in avoiding serious complications and improving the patient’s quality of life.
- How can professional advice help parents? Doctors' recommendations regarding proper nutrition and monitoring of the child's condition will help prevent serious consequences.
Advice from Dr. Oleg Korzhikov
Galactosemia is a very serious disease that requires careful attention from parents and medical staff. The main advice is to monitor diets and avoid foods rich in galactose and lactose. I recommend specially preparing hypoallergenic mixtures and carefully studying the composition of products. It is also important to pay attention to the psychoneurological development of the child, since some problems may not manifest themselves immediately. Regular consultations with a doctor and nutritionists will help ensure the highest possible quality of life for your child.
