raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:721

Gray platelet syndrome

Synonyms: Alpha storage pool deficiency · GPS · Platelet alpha-granule deficiency

Type
Disease
Group
Disorder
Inheritance
Autosomal dominant, Autosomal recessive
Age of onset
Childhood
Status
active

Gray platelet syndrome (GPS) is a rare inherited bleeding disorder characterized by macrothrombocytopenia, myelofibrosis, splenomegaly and typical gray appearance of platelets on Wright stained peripheral blood smear.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enGray platelet syndromeAlpha storage pool deficiency · GPS · Platelet alpha-granule deficiency
frSyndrome des plaquettes grisesGPS
deGray-platelet-SyndromAlpha-Granula-Mangel der Plättchen · Alpha-Storage-Pool-Krankheit · Alpha-Thrombozytengranula-Mangel · GPS · Graue Thrombozyten-Syndrom
esSíndrome de plaquetas grisesDeficiencia de almacenamiento del pool de gránulos alfa · Deficiencia de gránulos alfa plaquetarios · GPS · Sindrome plaquetario gris
itSindrome delle piastrine grigieDeficit dei granuli alfa delle piastrine · Deficit del pool di riserva dei granuli alfa · GPS
nlGrijze bloedplaatjes-syndroomAlfa-storage-pooldeficiëntie · Deficiëntie van alfa-granulen in bloedplaatjes · GPS
ptSíndrome de plaquetas cinzentas
plZespół szarych płytekGPS · Niedobór puli magazynowej alfa · Niedobór ziarnistości alfa w płytkach krwi · Zespół szarych płytek
csSyndrom šedých destičekGPS · Deficit alfa střádavých granul · Deficit destičkových alfa-granul
ukСиндром сірих тромбоцитівДефіцит пулу зберігання даних Alpha · GPS · Дефіцит альфа-гранул тромбоцитів
zh灰色血小板综合征α血小板-颗粒缺乏症
trGri trombosit sendromuGPS · Alfa depolama havuzu eksikliği · Trombosit alfa granül eksikliği

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM139090Evalidated
OMIM187900BTNTvalidated
ICD-10D69.1NTBTinclusionvalidated
ICD-113B62.00NTBTindexvalidated
MONDO0007686Evalidated
MeSHD055652Evalidated
UMLSC0272302Evalidated
GARD2562Evalidated

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
NBEAL2Disease-causing germline mutation(s) (loss of function) inAssessedHGNC:31928ENSG000001607966141693p21.31neurobeachin like 221765411[PMID]_21765412[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families60 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

8 annotations · validated 2017-08-02
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0001892Abnormal bleeding
HP:0001872Abnormality of thrombocytes
HP:0000978Bruising susceptibility
HP:0001873Thrombocytopenia
Frequent (79-30%)
HP:0000140Abnormality of the menstrual cycle
HP:0000421Epistaxis
HP:0002863Myelodysplasia
HP:0001744Splenomegaly

Run the differential on the 4 obligate / very frequent terms

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Sources for this card