Sneddon Syndrome (SNDNS)

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UniProtKB/Swiss-Prot: ⁷³ An autosomal recessive, systemic non-inflammatory thrombotic vasculopathy characterized by the association of livedo racemosa, and in some cases livedo reticularis, with cerebrovascular disease. Livedo racemosa is a persistent net-like violaceous-cyanotic, mottled discoloration of the skin affecting the legs, the arms, the buttocks and the trunk; livedo reticularis is limited to the extremities and is visible only in the cold. Cerebrovascular features include recurrent transient ischemic attacks, infarcts, and rarely spinal strokes or intracranial or subarachnoid hemorrhages. Headache and vertigo may precede the onset of livedo racemosa and cerebrovascular manifestations by several years. Rare neurologic symptoms include seizures, chorea, or myelopathies.

MalaCards based summary: Sneddon Syndrome, also known as livedo reticularis and cerebrovascular accidents, is related to antiphospholipid syndrome and central nervous system origin vertigo, and has symptoms including headache, hemiplegia and seizures. An important gene associated with Sneddon Syndrome is ADA2 (Adenosine Deaminase 2), and among its related pathways/superpathways are Metabolism of proteins and Response to elevated platelet cytosolic Ca2+. Affiliated tissues include skin, heart and bone, and related phenotypes are behavioral abnormality and vertigo

GARD: ¹⁹ Sneddon syndrome is a rare, progressive condition that affects blood vessels. It is primarily characterized by livedo reticularis (net-like patterns of discoloration on the skin) and neurological abnormalities. Symptoms may include transient ischemic attacks (mini-strokes) and strokes; headache; dizziness; high blood pressure; and heart disease. Reduced blood flow to the brain may cause reduced intellectual ability, memory loss, personality changes, and/or other neurological symptoms. The cause of Sneddon syndrome is often unknown, but it is sometimes associated with an autoimmune disease. Most cases are sporadic but some familial cases with autosomal dominant inheritance have been reported.

OMIM®: ⁵⁷ Sneddon syndrome is a noninflammatory arteriopathy characterized by onset of livedo reticularis in the second decade and onset of cerebrovascular disease in early adulthood (summary by Bras et al., 2014). Livedo reticularis occurs also with polyarteritis nodosa, systemic lupus erythematosus, and central thrombocythemia, any one of which may be accompanied by cerebrovascular accidents (Bruyn et al., 1987). (182410) (Updated 24-Oct-2022)

Disease Ontology: ¹¹ An artery disease that is characterized by onset of livedo reticularis in the second decade and onset of cerebrovascular disease in early adulthood and that has material basis in compound heterozygous mutation in the CECR1 gene (ADA2) on chromosome 22q11.

Orphanet: ⁵⁸ Sneddon's syndrome (SS) is a rare non-inflammatory thrombotic vasculopathy characterized by the combination of cerebrovascular disease with livedo racemosa.

Wikipedia: ⁷⁵ Sneddon's syndrome is a form of arteriopathy characterized by several symptoms,... more...

Clinical features from OMIM®:

Search Clinical Trials, NIH Clinical Center for Sneddon Syndrome