A Case Report: Treatment, follow-up, and literature review of type A insulin resistance syndrome caused by a De Novo INSR c.3328G>C mutation - Report - MDSpire

A Case Report: Treatment, follow-up, and literature review of type A insulin resistance syndrome caused by a De Novo INSR c.3328G>C mutation

  • By

  • Chunmin Ji

  • Xiaojun Zheng

  • Quanxing Wang

  • Zhongyun Chen

  • May 26, 2026

  • 0 min

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Clinical Report: Management of Type A Insulin Resistance Syndrome Due to INSR Mutation

Overview

This report presents a case of a 12-year-old female with Type A insulin resistance syndrome (TAIRS) caused by a novel INSR mutation.

Background

Type A insulin resistance syndrome (TAIRS) is a rare genetic disorder characterized by severe insulin resistance and associated features such as hyperandrogenism and acanthosis nigricans. The condition often overlaps with polycystic ovary syndrome (PCOS).

Data Highlights

No numerical data or trial data provided in the source material.

Key Findings

['A 12-year-old female presented with severe hyperinsulinemia, hyperandrogenism, and acanthosis nigricans.', 'A de novo heterozygous variant in the INSR gene (c.3328G>C) was identified, classified as likely pathogenic.', 'The patient exhibited significant hirsutism with a Modified Ferriman-Gallwey score of 16.', 'Clinical features included prolonged menstrual periods and signs of virilization.']

Clinical Implications

Genetic testing is essential for adolescents presenting with atypical PCOS features.

Conclusion

This case expands the known pathogenic variant spectrum of the INSR gene and underscores the importance of genetic evaluation in diagnosing TAIRS.

Related Resources & Content

  1. Frontiers in Endocrinology, 2026 -- Hyperinsulinemic hypoglycemia due to pathogenic INSR variants: metabolic signature, phenotypic overlap, and semidominant inheritance
  2. The Journal of Clinical Endocrinology & Metabolism, 2025 -- Utility of the C-Peptide/Insulin Molar Ratio for Distinguishing Type A Insulin Resistance Syndrome From Type 2 Diabetes
  3. Frontiers in Endocrinology, 2026 -- Case Report: A novel likely pathogenic GCK variant in a young Chinese girl with severe insulin resistance
  4. INSR-Related Severe Insulin Resistance Syndrome - GeneReviews® - NCBI Bookshelf
  5. Recommendations from the 2023 international evidence-based guideline for the assessment and management of polycystic ovary syndrome - PubMed
  6. The Journal of Clinical Endocrinology & Metabolism — Insulin Resistance and Its Link to Cardiometabolic Risk in Nonobese Individuals at Risk of Prediabetes (STOP DIABETES)
  7. INSR-Related Severe Insulin Resistance Syndrome - GeneReviews®
  8. Recommendations from the 2023 international evidence-based guideline for the assessment and management of polycystic ovary syndrome - PubMed
  9. Genotype-stratified treatment for monogenic insulin resistance: a systematic review | Communications Medicine

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