Barter syndrome refers to a set of rare genetic disorders characterized by distinct kidney function abnormalities. These flaws impede the kidney's ability to reabsorb salt, resulting in electrolyte and fluid concentration abnormalities throughout the body. Mineral salts including potassium, calcium, magnesium, sodium, and chloride are among the electrolytes that are impacted.
Barter syndrome symptoms and severity differ from person to person and can be moderate to severe. Overt symptoms may appear at any age, from before birth through adulthood. Changes (mutations) in one or more genes cause Barter syndrome.
CAUSES AND CLASSIFICATION
Recessive mutations in the genes produce Barter syndromes. Barter syndrome is mainly divided into five subtypes. Mutations in the sodium chloride/potassium chloride gene (SLC12A1) cause Type I. Mutations in the KCNJ1 gene cause Type II. Mutations in the chloride channel gene cause Type III.
Loss-of-function mutations in the gene encoding bar tin lead to Type IV. Mutations in the extracellular calcium ion-sensing receptor and the genes encoding the chloride channel subunits are responsible for Type V.
SIGNS AND SYMPTOMS
Among people who have the same subtype, the age of start, severity, and specific symptoms linked with Barter syndrome can differ significantly. Some people may have minor cases, while others may have serious, potentially life-threatening delivery problems. Barter syndromes types I, II, IVA, and IVB are linked to a younger-onset (before birth) and more severe symptoms.
Barter syndrome type III can manifest before birth, albeit with lesser symptoms (see below), and many children with this subtype present with growth issues in infancy or early childhood. Symptoms might be rather diverse. Some people who are impacted may simply have minor symptoms. Muscle weakness, cramps, spasms, and weariness are all common complaints.
Polydipsia (excessive thirst), polyuria (excessive urine), and the need to urinate at night (nocturia) are possible symptoms. Despite drinking enough water, frequent urinating can cause dehydration. Constipation, vomiting, a raised body temperature, lethargy, and an overall sensation of ill health are all possible side effects.
Children's growth rates may be slower than predicted to their age and gender as they get older (growth retardation). If left untreated, impacted people may grow up to be shorter than they would have been as adults (short stature). Some children may have difficulties meeting developmental milestones (developmental delays).
The prenatal Barter syndromes, also known as Barter syndromes I and II, and Barter syndromes IVA and IVB, have signs and symptoms that can be noticed before birth (antenatal period). Excessive urine production and an inappropriate buildup of amniotic fluid surrounding the growing fetus can result from faulty kidney function in uteri (polyhydramnios). Premature birth is common. Affected newborns may endure excessive urination (polyuria) as well as life-threatening fever and dehydration during the newborn period. Vomiting and diarrhea are other possible side effects.
Barter type V is a unique kind that appears as an excess of amniotic fluid (polyhydramnios), which is usually severe and leads to premature birth. Prematurity can occur so early in pregnancy that the infant is unable to survive outside the mother's womb. Despite this, all kidney symptoms of increased urine production and electrolyte loss resolve naturally within weeks of birth, requiring no therapy. Because the gene that causes Barter syndrome type V is on the X-chromosome, it affects mostly boys.
A triangularly formed face, prominent forehead, wide eyes, prominent, pointed ears, and a “pouting” expression due to drooping of the mouth corners are all common facial traits in affected infants. These distinguishing characteristics may be absent or so minor that they go overlooked in some circumstances.
Because the auditory nerves' ability to convey sensory input to the brain is disrupted in Barter syndrome types IVA and IVB, affected infants cannot hear from birth (congenital sensorineural deafness). In some cases, cognitive and motor development are also affected, and children who are impacted may face delays in meeting developmental milestones. This is most likely linked to the level of prematurity.
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