raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:857

Townes-Brocks syndrome

Synonyms: Imperforate anus-hand, foot and ear anomalies syndrome · REAR syndrome · Renal-ear-anal-radial syndrome · Sensorineural deafness with imperforate anus and hypoplastic thumbs · Sensorineural hearing loss with imperforate anus and hypoplastic thumbs · TBS · Townes syndrome

Type
Malformation syndrome
Group
Disorder
Inheritance
Autosomal dominant
Age of onset
All ages
Status
active

A rare genetic disorder characterized by the triad of imperforate anus, dysplastic ears often associated with sensorineural and/or conductive hearing impairment, and thumb malformations. These features are often associated with other signs mainly affecting the kidneys and heart.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enTownes-Brocks syndromeImperforate anus-hand, foot and ear anomalies syndrome · REAR syndrome · Renal-ear-anal-radial syndrome · Sensorineural deafness with imperforate anus and hypoplastic thumbs · Sensorineural hearing loss with imperforate anus and hypoplastic thumbs · TBS · Townes syndrome
frSyndrome de Townes-BrocksSyndrome REAR · TBS
deTownes-Brocks-SyndromAnalatresie mit Hand-, Fuß-und Ohranomalien · REAR-Syndrom · Sensorineurale Schwerhörigkeit mit Anus imperforatus und hypoplastischen Daumen · TBS · Townes-Syndrom
esSíndrome de Townes-BrocksAno imperforado con anomalías en manos, pies y orejas · Hipoacusia neurosensorial con ano imperforado y pulgares hipoplásicos · Sordera neurosensorial con ano imperforado y pulgares hipoplásicos · Síndrome REAR · Síndrome de Townes · Síndrome renal-oído-anal-radial · TBS
itSindrome di Townes-BrocksAno imperforato con anomalie delle mani, dei piedi e dell'orecchio · Sindrome REAR · Sindrome di Townes · Sindrome renale-orecchio-anale-radiale · Sordità neurosensoriale con ano imperforato e ipoplasia dei pollici · TBS
nlSyndroom van Townes-BrocksAnusatresie - hand-, voet- en ooranomalieën-syndroom · REAR-syndroom · Renaal-oor-anaal-radiaal syndroom · Sensorineurale doofheid met anusatresie en hypoplastische duimen · Syndroom van Townes · TBS
ptSíndrome Townes-Brocks
plZespół Townesa i Brocksa= en
csTownesův-Brocksův syndromNeperforovaný anus s anomáliemi rukou, nohou a uší · REAR syndrom · Senzorineurální hluchota s neperforovaným anem a hypoplastickými palci · TBS · Syndrom postihující ledviny, uši, anus a vřetenní kost · Townesův syndrom · Townes-Brocksův syndrom
ukСиндром Таунса-БроксаСиндром аномалій анального отвору-руки, ноги та вуха · Синдром REAR · Нирково-вушно-анально-променевий синдром · Сенсоневральна глухота з імперфорацією ануса та гіпопластичними великими пальцями · Сенсоневральна приглухуватість з імперфорацією ануса та гіпопластичними великими пальцями · TBS · Синдром Таунса
zh汤-布综合征感音神经性听力丧失伴肛门闭锁及拇指发育不全
trTownes-Brocks sendromuTBS · REAR sendromu · Townes sendromu · Böbrek-kulak-anal-radyal sendrom · Deliksiz anüs-el, ayak ve kulak anomalileri sendromu · Deliksiz anüs ve hipoplastik baş parmaklar ile seyreden sensörinöral sağırlık · Deliksiz anüs ve hipoplastik başparmak ile seyreden sensörinöral işitme kaybı

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM107480BTNTvalidated
OMIM617466BTNTvalidated
ICD-10Q87.8NTBTattributedvalidated
ICD-11LD2F.1YNTBTindexvalidated
MONDO0007142Evalidated
MeSHC536974Evalidated
UMLSC0265246Evalidated
GARD7784Evalidated

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 (5):

No children.

4

Genes

2 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
SALL1Disease-causing germline mutation(s) (loss of function) inAssessedHGNC:10524ENSG0000010344960221816q12.1spalt like transcription factor 120301618[PMID]
DACT1Disease-causing germline mutation(s) inAssessedHGNC:17748ENSG0000016561760786114q23.1dishevelled binding antagonist of beta catenin 128054444[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Prevalence at birth1-9 / 1 000 0000.42 / 100 000SpainValue and classValidated10083645[PMID]
Point prevalence1-9 / 1 000 000—EuropeClass onlyNot yet validatedORPHANET

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

66 annotations · validated 2016-06-01
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0000377Abnormal pinna morphology
HP:0002023Anal atresia
HP:0000384Preauricular skin tag
HP:0001177Preaxial hand polydactyly
HP:0004792Rectoperineal fistula
HP:0000143Rectovaginal fistula
HP:0001199Triphalangeal thumb
Frequent (79-30%)
HP:0001760Abnormal foot morphology
HP:0001545Anteriorly placed anus
HP:0004209Clinodactyly of the 5th finger
HP:0002019Constipation
HP:0000028Cryptorchidism
HP:0000365Hearing impairment
HP:0008551Microtia
HP:0000396Overfolded helix
HP:0001763Pes planus
HP:0000083Renal insufficiency
HP:0001482Subcutaneous nodule
HP:0001863Toe clinodactyly
Occasional (29-5%)
HP:0001671Abnormal cardiac septum morphology
HP:0030680Abnormal cardiovascular system morphology
HP:0001641Abnormal pulmonary valve morphology
HP:0012210Abnormal renal morphology
HP:0000772Abnormal rib morphology
HP:0009912Abnormal tragus morphology
HP:0003468Abnormal vertebral morphology
HP:0000130Abnormality of the uterus
HP:0000142Abnormality of the vagina
HP:0000504Abnormality of vision
HP:0010760Absent toe
HP:0001274Agenesis of corpus callosum
HP:0010331Aplasia/Hypoplasia of the 3rd toe
HP:0001631Atrial septal defect
HP:0000048Bifid scrotum
HP:0000581Blepharophimosis
HP:0002607Bowel incontinence
HP:0010059Broad hallux phalanx
HP:0011304Broad thumb
HP:0000518Cataract
HP:0002308Chiari malformation
HP:0000567Chorioretinal coloboma
HP:0006824Cranial nerve paralysis
HP:0000823Delayed puberty
HP:0000086Ectopic kidney
HP:0000324Facial asymmetry
HP:0001508Failure to thrive
HP:0008736Hypoplasia of penis
HP:0000047Hypospadias
HP:0000821Hypothyroidism
HP:0001249Intellectual disability
HP:0000612Iris coloboma
HP:0001140Limbal dermoid
HP:0100559Lower limb asymmetry
HP:0000568Microphthalmia
HP:0005562Multiple renal cysts
HP:0009944Partial duplication of thumb phalanx
HP:0001643Patent ductus arteriosus
HP:0000089Renal hypoplasia
HP:0004322Short stature
HP:0000486Strabismus
HP:0001636Tetralogy of Fallot
HP:0001770Toe syndactyly
HP:0009465Ulnar deviation of finger
HP:0010481Urethral valve
HP:0000076Vesicoureteral reflux
HP:0000154Wide mouth

Run the differential on the 7 obligate / very frequent terms

7

Sources for this card