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Proximal symphalangism 1A(SYM1A)

MedGen UID:
811492
Concept ID:
C3714899
Disease or Syndrome
Synonyms: CUSHING SYMPHALANGISM; HEREDITARY ABSENCE OF THE PROXIMAL INTERPHALANGEAL JOINTS; SYM1; SYM1A; SYMPHALANGISM, PROXIMAL, 1A
 
Gene (location): NOG (17q22)
 
Monarch Initiative: MONDO:0020733
OMIM®: 185800

Definition

Proximal symphalangism-1A (SYM1A) is an autosomal dominant disorder characterized by ankylosis of the proximal interphalangeal joints, carpal and tarsal bone fusion, and, in some cases, conductive deafness (Strasburger et al., 1965). Genetic Heterogeneity of Proximal Symphalangism Another form of proximal symphalangism (SYM1B; 615298) is caused by mutation in the GDF5 gene (601146). [from OMIM]

Clinical features

From HPO
Short 5th metacarpal
MedGen UID:
348858
Concept ID:
C1861388
Finding
Short fifth metacarpal bone.
Aplasia/Hypoplasia of the middle phalanges of the hand
MedGen UID:
354674
Concept ID:
C1862152
Finding
Aplasia/Hypoplasia of the middle phalanges of the toes
MedGen UID:
869548
Concept ID:
C4023976
Finding
Metacarpophalangeal synostosis
MedGen UID:
870663
Concept ID:
C4025117
Anatomical Abnormality
Fusion of a metacarpal bone with the proximal phalanx of the finger distal to it across the corresponding metacarpophalangeal joint.
Conductive hearing impairment
MedGen UID:
9163
Concept ID:
C0018777
Disease or Syndrome
An abnormality of vibrational conductance of sound to the inner ear leading to impairment of sensory perception of sound.
Stapes ankylosis
MedGen UID:
350008
Concept ID:
C1861326
Anatomical Abnormality
Stapes ankylosis refers to congenital or acquired fixation of the stapes (the stirrup-shaped small bone or ossicle in the middle ear), which is associated with conductive hearing resulting from impairment of the sound-conduction mechanism (the external auditory canal, tympanic membrane, and/or middle-ear ossicles).
Tarsal synostosis
MedGen UID:
539393
Concept ID:
C0265654
Congenital Abnormality
Synostosis (bony fusion) involving one or more bones of the tarsus (calcaneus, talus, cuboid, navicular, cuneiiform bones).
Carpal synostosis
MedGen UID:
98468
Concept ID:
C0431863
Congenital Abnormality
Synostosis (bony fusion) involving one or more bones of the carpus (scaphoid, lunate, triquetrum, trapezium, trapezoid, capitate, hamate, pisiform).
Distal symphalangism of hands
MedGen UID:
350607
Concept ID:
C1862158
Finding
The term distal symphalangism refers to a bony fusion of the distal and middle phalanges of the digits of the hand, in other words the distal interphalangeal joint (DIJ) is missing which can be seen either on x-rays or as an absence of the distal interphalangeal finger creases.
Proximal symphalangism of hands
MedGen UID:
867247
Concept ID:
C4021607
Anatomical Abnormality
The term proximal symphalangism refers to a bony fusion of the middle and proximal phalanges of the digits of the hand, in other words the proximal interphalangeal joint (PIJ) is missing which can be seen either on x-rays or as an absence of the proximal interphalangeal finger creases.

Professional guidelines

PubMed

Ma C, Liu L, Wang FN, Tian HS, Luo Y, Yu R, Fan LL, Li YL
BMC Med Genet 2019 Nov 6;20(1):169. doi: 10.1186/s12881-019-0917-5. PMID: 31694554Free PMC Article

Recent clinical studies

Diagnosis

Ma C, Liu L, Wang FN, Tian HS, Luo Y, Yu R, Fan LL, Li YL
BMC Med Genet 2019 Nov 6;20(1):169. doi: 10.1186/s12881-019-0917-5. PMID: 31694554Free PMC Article
Brown DJ, Kim TB, Petty EM, Downs CA, Martin DM, Strouse PJ, Moroi SE, Milunsky JM, Lesperance MM
Am J Hum Genet 2002 Sep;71(3):618-24. Epub 2002 Jun 27 doi: 10.1086/342067. PMID: 12089654Free PMC Article

Prognosis

Brown DJ, Kim TB, Petty EM, Downs CA, Martin DM, Strouse PJ, Moroi SE, Milunsky JM, Lesperance MM
Am J Hum Genet 2002 Sep;71(3):618-24. Epub 2002 Jun 27 doi: 10.1086/342067. PMID: 12089654Free PMC Article

Clinical prediction guides

Brown DJ, Kim TB, Petty EM, Downs CA, Martin DM, Strouse PJ, Moroi SE, Milunsky JM, Lesperance MM
Am J Hum Genet 2002 Sep;71(3):618-24. Epub 2002 Jun 27 doi: 10.1086/342067. PMID: 12089654Free PMC Article

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