Genetic Mechanisms of Congenital Hypothyroidism

Congenital hypothyroidism is a common neonatal endocrine disorder arising from insufficient thyroid hormone production. Genetic causes involve anomalies of gland development (thyroid dysgenesis) and defects in hormone biosynthesis (thyroid dyshormonogenesis). Dysgenesis may stem from mutations in transcription factors such as NKX2-1, PAX8, FOXE1 and the thyroid-stimulating hormone receptor, disrupting thyroid migration or growth. Dyshormonogenesis encompasses defects in thyroglobulin, thyroid peroxidase, dual oxidases (DUOX2/DUOXA2), iodide transporters (SLC5A5, SLC26A4) and deiodinases (IYD), often with autosomal recessive inheritance. Emerging insights reveal oligogenic interactions and non-coding regulatory variants modulating phenotypic variability. Advances in genetic screening have improved early detection, enabling prompt levothyroxine therapy to prevent neurodevelopmental impairment. Continued characterisation of molecular pathways informs personalised treatment strategies and highlights the global impact of genetic screening programmes on childhood health.

Research from Nature Portfolio

Recent studies have uncovered non-coding microsatellite variants within a thyroid-specific transcriptional repressor at 15q26.1, linking familial non-goitrous congenital hypothyroidism with multinodular goitre. Functional assays demonstrate disrupted repressor activity leading to impaired thyroid hormone synthesis, emphasising the role of regulatory DNA elements in thyroid development. Another investigation employing single-cell and spatial transcriptomics identified a subset of NF-κB-activated thyrocytes that migrate and form new follicles under the influence of myeloid-derived TNF-α in vertebrate models. This work illuminates cellular crosstalk mechanisms in thyroid organogenesis and suggests inflammatory signalling as a key modulator of gland architecture.

Genetic Mechanisms of Congenital Hypothyroidism publication trend

The graph below shows the total number of articles in genetic mechanisms of congenital hypothyroidism across all publications each year (not limited to Nature Index journals).

Technical terms

Thyroid dysgenesis: Abnormal development or migration of the thyroid gland.

Thyroid dyshormonogenesis: Defects in the biochemical pathway of thyroid hormone synthesis.

Oligogenicity: Phenotypic effects arising from variants in multiple genes.

Microsatellite: Short tandem repeat in non-coding DNA affecting gene regulation.

Thyrocyte: Epithelial cell of the thyroid gland responsible for hormone production.

NF-κB: Transcription factor activated by inflammatory signals influencing cell migration.

Endoplasmic reticulum proteostasis: Balance of protein synthesis, folding and degradation within the ER.

References

1. Functional variants in a TTTG microsatellite on 15q26.1 cause familial nonautoimmune thyroid abnormalities. Nature Genetics (2024).
2. Myeloid cells interact with a subset of thyrocytes to promote their migration and follicle formation through NF-κB. Nature Communications (2023).
3. Perturbation of endoplasmic reticulum proteostasis triggers tissue injury in the thyroid gland. JCI Insight (2023).
4. Patients with Thyroid Dyshormonogenesis and DUOX2 Variants: Molecular and Clinical Description and Genotype–Phenotype Correlation. International Journal of Molecular Sciences (2024).
5. DUOX2/DUOXA2 Mutations Frequently Cause Congenital Hypothyroidism that Evades Detection on Newborn Screening in the United Kingdom. Thyroid (2019).