creatine transporter deficiency
Findings
No curated finding names creatine transporter deficiency yet. Everything below is reference data from Mondo, HPO and GenCC, not evidence about what affects it.
Definition
X-linked creatine transporter deficiency (CRTR-D) is a creatine deficiency syndrome characterized clinically by global developmental delay/ intellectual disability (DD/ID) with prominent speech/language delay, autistic behavior and seizures.
Definition from the Mondo Disease Ontology (MONDO:0010305), read 2026-09-29. CC BY 4.0.
- Inheritance
- X-linked recessive inheritance
HPO, annotations 2026-09-02
Features
33 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.
- Elevated circulating creatine concentrationHPOHP:0034291
- 1 of 1 reported patient
- Global developmental delayHPOHP:0001263
- 4 of 4 reported patients
- Very frequent (80% to 99% of cases)
- Intellectual disabilityHPOHP:0001249
- 3 of 3 reported patients
- Very frequent (80% to 99% of cases)
- Reduced brain creatine level by MRSHPOHP:0025051
- 4 of 4 reported patients
- Abnormal circulating creatine concentrationHPOHP:0012113
- Very frequent (80% to 99% of cases)
- Delayed speech and language developmentHPOHP:0000750
- 2 of 4 reported patients
Show the remaining 21
- Autistic behaviorHPOHP:0000729
- Frequent (30% to 79% of cases)
- CachexiaHPOHP:0004326
- Frequent (30% to 79% of cases)
- ChoreaHPOHP:0002072
- Frequent (30% to 79% of cases)
- ConstipationHPOHP:0002019
- Frequent (30% to 79% of cases)
- DystoniaHPOHP:0001332
- Frequent (30% to 79% of cases)
- HyperactivityHPOHP:0000752
- Frequent (30% to 79% of cases)
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.
- SLC6A8HGNC:11055
- Definitive · ClinGen · X-linked · 2020
- Definitive · G2P · X-linked · 2015
- Definitive · Natera · X-linked recessive · 2023
- Strong · Labcorp Genetics (formerly Invitae) · X-linked · 2022
- Strong · PanelApp Australia · X-linked · 2025
- Supportive · Orphanet · X-linked · 2021
Where it sits
Other names
4 names
Resolves to: creatine transporter deficiency
- Also called
- cerebral creatine deficiency syndrome 1cerebral creatine deficiency syndrome 1, X-linked recessivecerebral creatine deficiency syndrome type 1SLC6A8 deficiency