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Autosomal recessive spinocerebellar ataxia 16(SCAR16)

MedGen UID:
1674542
Concept ID:
C5190574
Disease or Syndrome
Synonyms: SCAR16; SPINOCEREBELLAR ATAXIA, AUTOSOMAL RECESSIVE 16
SNOMED CT: Autosomal recessive cerebellar ataxia due to STUB1 deficiency (782719004); Autosomal recessive cerebellar ataxia due to STIP1 homology and U-box containing protein 1 deficiency (782719004); Spinocerebellar ataxia autosomal recessive type 16 (782719004); Autosomal recessive cerebellar ataxia due to STUB1 (STIP1 homology and U-box containing protein 1) deficiency (782719004); SCAR16 - spinocerebellar ataxia autosomal recessive type 16 (782719004)
Modes of inheritance:
Autosomal recessive inheritance
MedGen UID:
141025
Concept ID:
C0441748
Intellectual Product
Source: Orphanet
A mode of inheritance that is observed for traits related to a gene encoded on one of the autosomes (i.e., the human chromosomes 1-22) in which a trait manifests in individuals with two pathogenic alleles, either homozygotes (two copies of the same mutant allele) or compound heterozygotes (whereby each copy of a gene has a distinct mutant allele).
 
Gene (location): STUB1 (16p13.3)
 
Monarch Initiative: MONDO:0014339
OMIM®: 615768
Orphanet: ORPHA412057

Definition

Autosomal recessive spinocerebellar ataxia-16 (SCAR16) is a progressive neurologic disorder characterized by truncal and limb ataxia, resulting in gait instability, associated with cerebellar atrophy on brain imaging. Most patients have onset in the teenage years, although earlier and later onset have been reported. Additional features may include dysarthria, nystagmus, hyperreflexia of the lower limbs, and mild peripheral sensory neuropathy. Some patients have gonadal dysfunction or hypogonadism and/or cognitive deficits. The phenotype represents a spectrum or continuum of neurodegenerative features that may overlap with those of SCA48 (summary by Shi et al., 2013 and Ravel et al., 2021). [from OMIM]

Clinical features

From HPO
Ankle clonus
MedGen UID:
68672
Concept ID:
C0238651
Finding
Clonus is an involuntary tendon reflex that causes repeated flexion and extension of the foot. Ankle clonus is tested by rapidly flexing the foot upward.
Dysarthria
MedGen UID:
8510
Concept ID:
C0013362
Mental or Behavioral Dysfunction
Dysarthric speech is a general description referring to a neurological speech disorder characterized by poor articulation. Depending on the involved neurological structures, dysarthria may be further classified as spastic, flaccid, ataxic, hyperkinetic and hypokinetic, or mixed.
Spasticity
MedGen UID:
7753
Concept ID:
C0026838
Sign or Symptom
A motor disorder characterized by a velocity-dependent increase in tonic stretch reflexes with increased muscle tone, exaggerated (hyperexcitable) tendon reflexes.
Babinski sign
MedGen UID:
19708
Concept ID:
C0034935
Finding
Upturning of the big toe (and sometimes fanning of the other toes) in response to stimulation of the sole of the foot. If the Babinski sign is present it can indicate damage to the corticospinal tract.
Tremor
MedGen UID:
21635
Concept ID:
C0040822
Sign or Symptom
An unintentional, oscillating to-and-fro muscle movement about a joint axis.
Hyperreflexia
MedGen UID:
57738
Concept ID:
C0151889
Finding
Hyperreflexia is the presence of hyperactive stretch reflexes of the muscles.
Unsteady gait
MedGen UID:
68544
Concept ID:
C0231686
Finding
A shaky or wobbly manner of walking.
Cerebellar hypoplasia
MedGen UID:
120578
Concept ID:
C0266470
Congenital Abnormality
Cerebellar hypoplasia is a descriptive term implying a cerebellum with a reduced volume, but a normal shape and is stable over time.
Cognitive impairment
MedGen UID:
90932
Concept ID:
C0338656
Mental or Behavioral Dysfunction
Abnormal cognition is characterized by deficits in thinking, reasoning, or remembering.
Truncal ataxia
MedGen UID:
96535
Concept ID:
C0427190
Sign or Symptom
Truncal ataxia is a sign of ataxia characterized by instability of the trunk. It usually occurs during sitting.
Cerebellar atrophy
MedGen UID:
196624
Concept ID:
C0740279
Disease or Syndrome
Cerebellar atrophy is defined as a cerebellum with initially normal structures, in a posterior fossa with normal size, which displays enlarged fissures (interfolial spaces) in comparison to the foliae secondary to loss of tissue. Cerebellar atrophy implies irreversible loss of tissue and result from an ongoing progressive disease until a final stage is reached or a single injury, e.g. an intoxication or infectious event.
Limb ataxia
MedGen UID:
196692
Concept ID:
C0750937
Finding
A kind of ataxia that affects movements of the extremities.
Hypogonadism
MedGen UID:
5711
Concept ID:
C0020619
Disease or Syndrome
A decreased functionality of the gonad.
Nystagmus
MedGen UID:
45166
Concept ID:
C0028738
Disease or Syndrome
Rhythmic, involuntary oscillations of one or both eyes related to abnormality in fixation, conjugate gaze, or vestibular mechanisms.
External ophthalmoplegia
MedGen UID:
57662
Concept ID:
C0162292
Disease or Syndrome
Paralysis of the external ocular muscles.

Term Hierarchy

CClinical test,  RResearch test,  OOMIM,  GGeneReviews,  VClinVar  
  • CROGVAutosomal recessive spinocerebellar ataxia 16

Professional guidelines

PubMed

Amirifar P, Ranjouri MR, Lavin M, Abolhassani H, Yazdani R, Aghamohammadi A
Expert Rev Clin Immunol 2020 Sep;16(9):859-871. Epub 2020 Oct 15 doi: 10.1080/1744666X.2020.1810570. PMID: 32791865

Recent clinical studies

Etiology

Klivényi P, Szpisjak L, Salamon A, Németh VL, Szépfalusi N, Maróti Z, Kalmár T, Zimmermann A, Zádori D
Ideggyogy Sz 2023 Jan 30;76(1-2):63-72. doi: 10.18071/isz.76.0063. PMID: 36892293

Diagnosis

Klivényi P, Szpisjak L, Salamon A, Németh VL, Szépfalusi N, Maróti Z, Kalmár T, Zimmermann A, Zádori D
Ideggyogy Sz 2023 Jan 30;76(1-2):63-72. doi: 10.18071/isz.76.0063. PMID: 36892293
Turkgenc B, Sanlidag B, Eker A, Giray A, Kutuk O, Yakicier C, Tolun A, Temel SG
Hum Mutat 2018 Oct;39(10):1344-1348. Epub 2018 Aug 22 doi: 10.1002/humu.23601. PMID: 30058754

Prognosis

Turkgenc B, Sanlidag B, Eker A, Giray A, Kutuk O, Yakicier C, Tolun A, Temel SG
Hum Mutat 2018 Oct;39(10):1344-1348. Epub 2018 Aug 22 doi: 10.1002/humu.23601. PMID: 30058754

Clinical prediction guides

Turkgenc B, Sanlidag B, Eker A, Giray A, Kutuk O, Yakicier C, Tolun A, Temel SG
Hum Mutat 2018 Oct;39(10):1344-1348. Epub 2018 Aug 22 doi: 10.1002/humu.23601. PMID: 30058754

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