raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:231401

Alpha-thalassemia-myelodysplastic syndrome

Synonyms: ATMDS · Acquired HbH disease · Acquired hemoglobin H disease

Type
Disease
Group
Disorder
Inheritance
Not applicable
Age of onset
Adult
Status
active

An acquired form of alpha-thalassemia characterized by a myelodysplastic syndrome (MDS) or more rarely a myeloproliferative disease (MPD) associated with hemoglobin H disease (HbH).

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enAlpha-thalassemia-myelodysplastic syndromeATMDS · Acquired HbH disease · Acquired hemoglobin H disease
frSyndrome d'alpha-thalassémie-syndrome myélodysplasiqueATMDS · Hémoglobinose H acquise · Maladie HbH acquise · Thalassémie alpha-syndrome myélodysplasique
deAlpha-Thalassämie-myelodysplastisches SyndromATMDS · HbH-Krankheit, erworbene · Hämoglobin-H-Krankheit, erworbene
esAlfa-talasemia-síndrome mielodisplásicoATMDS · Enfermedad de la HbH adquirida · Enfermedad de la hemoglobina H adquirida
itAlfa talassemia - sindrome mielodisplasticaATMDS · Emoglobinopatia H acquisita · Malattia HbH acquisita
nlAlfa-thalassemie - myelodysplastisch syndroomATMDS · Verworven HbH-ziekte · Verworven hemoglobine H-ziekte
ptAlfa-talassemia-síndrome mielodisplásica
plAlfa-talasemia - zespół mielodysplastycznyATMDS · Nabyta choroba HbH · Nabyta choroba hemoglobiny H
csAlfa-talasémie s myelodysplastickým syndromemATMDS · Získaná HbH nemoc · Hemoglobinopatie s hemoglobinem H
ukАльфа-таласемія-мієлодиспластичний синдромНабута хвороба HbH · Набута хвороба гемоглобіну Н · ATMDS
zhα-地中海贫血-骨髓增生异常综合征获得性血红蛋白H病
trAlfa-talasemi-miyelodisplastik sendromATMDS · Edinsel HbH hastalığı · Edinsel hemoglobin H hastalığı

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM300448Evalidated
ICD-10D46.7NTBTattributedvalidated
ICD-10D56.0NTBTattributedvalidated
ICD-113A50.0YNTBTindexvalidated
MONDO0010328Evalidated
MeSHC563023Evalidated
UMLSC0585216Evalidated

E exact · NTBT this ORPHAcode is narrower than the target · BTNT broader than the target · ND not decided.

3

Classification

Preferential parent (Orphanet linearisation):

Parents in the classifications (1):

No children.

4

Genes

1 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
ATRXDisease-causing somatic mutation(s) inAssessedHGNC:886ENSG00000085224300032Xq21.1ATRX chromatin remodeler
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families80 casesWorldwideCase(s)Validated[EXPERT]
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidatedORPHANET

Value is Orphadata's ValMoy: the mean estimate per 100 000 for prevalence and incidence, the number of cases or families for case reports.

6

HPO phenotypes

12 annotations · validated 2016-06-01
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0001875Decreased total neutrophil count
HP:0012378Fatigue
HP:0011903HbH hemoglobin
HP:0001935Microcytic anemia
HP:0001873Thrombocytopenia
Frequent (79-30%)
HP:0001892Abnormal bleeding
HP:0000978Bruising susceptibility
HP:0002094Dyspnea
Occasional (29-5%)
HP:0002488Acute leukemia
HP:0002721Immunodeficiency
HP:0002863Myelodysplasia
HP:0001744Splenomegaly

Run the differential on the 5 obligate / very frequent terms

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Sources for this card