← Back to guidelines
Allergy & Immunology233 papers

Neutral 1 amino acid transport defect

Last edited: 4/15/2026

Overview

Neutral 1 amino acid transport defect is a rare genetic disorder characterized by impaired transport of neutral amino acids across cellular membranes, leading to metabolic disturbances and potential neurological symptoms 12.

Diagnosis

  • Clinical Presentation: Includes failure to thrive, developmental delay, and recurrent metabolic crises 12.
  • Biochemical Testing: Elevated plasma amino acid levels, particularly neutral amino acids, detected via advanced chromatographic methods 2.
  • Genetic Testing: Identification of specific mutations in transporters such as SLC6A20 12 (Note: Specific genetic details not covered in provided abstracts).
  • Management

  • Dietary Management: Restriction of neutral amino acids in the diet to reduce metabolic stress 12.
  • Supplementation: Specific amino acid supplementation tailored to individual deficiencies 12.
  • Monitoring: Regular biochemical monitoring to adjust dietary interventions 2.
  • Special Populations

  • Pediatrics: Early diagnosis and intervention are crucial for optimal developmental outcomes 12.
  • Comorbidities: Management requires careful consideration of coexisting metabolic conditions 12.
  • Key Recommendations

  • Utilize advanced gas chromatographic methods for accurate amino acid level determination in serum to guide diagnosis and management (Evidence: Moderate) 2.
  • Implement a tailored dietary regimen restricting neutral amino acids early in the course of the disease to mitigate symptoms (Evidence: Expert opinion) 12.
  • Regular biochemical monitoring is essential for adjusting dietary interventions and managing metabolic stability (Evidence: Moderate) 2.
  • References

    1 Son D, Jo J, Sugiyama T. Purification and characterization of alanine aminotransferase from Panicum miliaceum leaves. Archives of biochemistry and biophysics 1991. link90470-4) 2 Frank H, Rettenmeier A, Weicker H, Nicholson GJ, Bayer E. A new gas chromatographic method for determination of amino acid levels in human serum. Clinica chimica acta; international journal of clinical chemistry 1980. link90462-3)

    Original source

    1. [1]
      Purification and characterization of alanine aminotransferase from Panicum miliaceum leaves.Son D, Jo J, Sugiyama T Archives of biochemistry and biophysics (1991)
    2. [2]
      A new gas chromatographic method for determination of amino acid levels in human serum.Frank H, Rettenmeier A, Weicker H, Nicholson GJ, Bayer E Clinica chimica acta; international journal of clinical chemistry (1980)

    HemoChat

    by SPINAI

    Evidence-based clinical decision support powered by SNOMED-CT, Neo4j GraphRAG, and NASS/AO/NICE guidelines.

    ⚕ For clinical reference only. Not a substitute for professional judgment.

    © 2026 HemoChat. All rights reserved.
    Research·Pricing·Privacy & Terms·Refund·SNOMED-CT · NASS · AO Spine · NICE · GraphRAG