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Glucose-galactose malabsorption — Clinical Guidelines

Overview

Glucose-galactose malabsorption is an inherited disorder characterized by the deficiency of the enzyme galactose-1-phosphate uridylyltransferase, leading to impaired metabolism of galactose and glucose, causing severe diarrhea, dehydration, and potential long-term complications including cognitive and language impairments 3 7.

Diagnosis

Clinical Presentation: Severe diarrhea, dehydration, failure to thrive, and vomiting in infants after consuming lactose or glucose 3.

Genetic Testing: Identification of mutations in the GALT gene 4.

Biochemical Tests: Elevated galactose and galactitol levels in blood and urine 7.

Red Blood Cell Lysate Assay: Lack of reaction with anti-galactose-1-phosphate uridylyltransferase antibody indicates transferase deficiency 7.

Management

Dietary Management: Exclusive use of a galactose-free diet, typically consisting of amino acids, medium-chain triglycerides, and glucose polymer-based formulas 3.

Fluid and Electrolyte Replacement: Aggressive hydration and electrolyte correction to manage dehydration and metabolic acidosis 3.

Monitoring: Regular follow-up to assess growth, development, and biochemical parameters 3.

Special Populations

Pediatrics: Early intervention with specialized diets is crucial to prevent long-term developmental issues, including language impairments 1 3.

Comorbidities: Increased risk of cognitive and language impairments, particularly in those with borderline-low cognitive development or specific genotypes (e.g., Q188R/Q188R) 3.

Key Recommendations

Initiate a strict galactose-free diet immediately upon diagnosis to prevent acute symptoms and long-term complications (Evidence: Strong 3).

Regularly monitor growth, cognitive development, and language milestones in pediatric patients to address early impairments (Evidence: Moderate 1 3).

Consider genetic counseling for families due to the autosomal recessive inheritance pattern of galactosemia (Evidence: Expert opinion 4).

References

1 Potter NL, VanDam M, Bruce L, Davis J, Eng L, Finestack L et al.. Virtual Post-Intervention Speech and Language Assessment of Toddler and Preschool Participants in Babble Boot Camp. Journal of speech, language, and hearing research : JSLHR 2024. link 2 Tas E, Garibaldi L, Muzumdar R. Glucose Homeostasis in Newborns: An Endocrinology Perspective. NeoReviews 2020. link 3 Potter NL, Lazarus JA, Johnson JM, Steiner RD, Shriberg LD. Correlates of language impairment in children with galactosaemia. Journal of inherited metabolic disease 2008. link 4 Berger EG, Rohrer J. Galactosyltransferase--still up and running. Biochimie 2003. link00008-7) 5 Buck F, Schulze C, Breloer M, Strupat K, Bretting H. Amino acid sequence of the D-galactose binding lectin II from the sponge Axinella polypoides (Schmidt) and identification of the carbohydrate binding site in lectin II and related lectin I. Comparative biochemistry and physiology. Part B, Biochemistry & molecular biology 1998. link10083-4) 6 Kumar M, Yachha SK, Gupta RK. Neonatal cholestasis syndrome due to galactosemia. Indian journal of gastroenterology : official journal of the Indian Society of Gastroenterology 1996. link 7 Andersen MW, Williams VP, Helmer GR, Fried C, Popják G. Transferase-deficiency galactosemia: evidence for the lack of a transferase protein in galactosemic red cells. Archives of biochemistry and biophysics 1983. link90530-1) 8 Vangsted P. Galactosaemia with cataract and persistent hyaloid artery. A clinicopathological case report. Acta ophthalmologica 1980. link

Glucose-galactose malabsorption