X-linked central congenital hypothyroidism with late-onset testicular enlargement
Findings
No curated finding names X-linked central congenital hypothyroidism with late-onset testicular enlargement yet. Everything below is reference data from Mondo, HPO and GenCC, not evidence about what affects it.
Definition
An X-linked recessive syndrome caused by loss-of-function mutation(s) in IGSF1, encoding immunoglobulin superfamily member 1. This condition can result in central hypothyroidism, macroorchidism, delayed puberty, and variable prolactin deficiency.
Definition from the Mondo Disease Ontology (MONDO:0010475), read 2026-09-29. CC BY 4.0.
- Inheritance
- X-linked recessive inheritance
HPO, annotations 2026-09-02
Features
4 features
What the disease is reported to present with, and how often among people who have it — never how often a feature means the disease. HPO, annotations 2026-09-02.
- HypothyroidismHPOHP:0000821
- 17 of 17 reported patients
- Inappropriately normal thyroid-stimulating hormone levelHPOHP:0033075
- 16 of 16 reported patients
- Reduced circulating prolactin concentrationHPOHP:0008202
- 16 of 24 reported patients
- Reduced TSH response to thyrotrophin-releasing hormone stimulation testHPOHP:0033082
Genes
1 gene
Germline variants in the gene encoding each protein, as classified by GenCC submitters, each in their own words. Limited, disputed and refuted submissions are listed too.
- IGSF1HGNC:5948
- Definitive · Ambry Genetics · X-linked · 2018
- Definitive · G2P · X-linked · 2015
- Strong · Labcorp Genetics (formerly Invitae) · X-linked · 2022
- Strong · PanelApp Australia · X-linked · 2025
- Supportive · Orphanet · X-linked · 2021
Where it sits
Other names
6 names
Resolves to: X-linked central congenital hypothyroidism with late-onset testicular enlargement
- Also called
- CHTEhypothyroidism Central and testicular enlargementhypothyroidism, central, and testicular enlargement, X-linked recessiveIGSF1 deficiency syndromeImmunoglobulin superfamily member 1 deficiency syndromeX-linked central congenital hypothyroidism with late-onset macroorchidism