Thyrocalcitonin-containing cells in the Di George anomaly

Area of Science:

• Developmental Biology
• Endocrinology
• Genetics

Background:

• Di George syndrome involves pharyngeal pouch and aortic arch developmental defects.
• The ultimobranchial body, source of thyroid C cells, arises from the fifth pharyngeal pouch.
• A deficiency in thyroid C cells may be part of the Di George anomaly spectrum.

Purpose of the Study:

• To investigate the presence of thyrocalcitonin (TC)-containing cells in the thyroid glands of infants with Di George syndrome.
• To compare C cell presence in Di George syndrome patients with age-matched controls.
• To explore the relationship between Di George anomaly, C cells, and neurocristopathy.

Main Methods:

• Immunohistochemical examination of thyroid glands from 11 Di George syndrome patients and 11 controls.
• Utilized immunoperoxidase technique to detect thyrocalcitonin (TC)-containing cells.
• Analyzed lung tissue for TC-containing cells to assess asynchronous development.

Main Results:

• Only 27% of Di George syndrome patients had TC-containing cells, versus 82% in controls.
• Thyroid C cell deficiency is prevalent in Di George anomaly.
• Lung TC-containing cells were similar in both groups, suggesting independent development.

Conclusions:

• Thyroid C cell deficiency is common in Di George anomaly, linking it to third-fifth visceral pouch development.
• A spectrum of C cell deficiency mirrors pharyngeal pouch derivative variations.
• Findings support a neural crest origin for Di George syndrome, classifying it as a neurocristopathy.