SMARCAD1
Function
DNA helicase that possesses intrinsic ATP-dependent nucleosome-remodeling activity and is both required for DNA repair and heterochromatin organization. Promotes DNA end resection of double-strand breaks (DSBs) following DNA damage: probably acts by weakening histone DNA interactions in nucleosomes flanking DSBs. Required for the restoration of heterochromatin organization after replication. Acts at replication sites to facilitate the maintenance of heterochromatin by directing H3 and H4 histones deacetylation, H3 'Lys-9' trimethylation (H3K9me3) and restoration of silencing.
Involvement in disease
Adermatoglyphia
ADERM
An autosomal dominant condition characterized by the lack of epidermal ridges on the palms and soles, which results in the absence of fingerprints, and is associated with a reduced number of sweat gland openings and reduced sweating of palms and soles.
None
The disease is caused by variants affecting the gene represented in this entry. Splice site mutations causing aberrant splicing of skin-specific isoform 3 are likely to exert a loss-of-function effect and are involved in ADERM.
Basan syndrome
BSNS
An autosomal dominant form of adermatoglyphia associated with congenital facial milia, acral blistering, digital contractures, and nail abnormalities. Adermatoglyphia is defined by the lack of epidermal ridges on the palms and soles, which results in the absence of fingerprints.
None
The disease is caused by variants affecting the gene represented in this entry. Splice site mutations causing aberrant splicing of skin-specific isoform 3 are likely to exert a loss-of-function effect and are involved in BSNS.
Huriez syndrome
HRZ
An autosomal dominant syndrome characterized by atrophic fibrosis of the skin of the limbs, nail hypoplasia, and palmoplantar keratoderma. Malignant degeneration of affected skin resulting in aggressive squamous cell carcinoma and early metastasis formation is a distinctive feature of the syndrome.
None
The disease is caused by variants affecting the gene represented in this entry.
Sequence Similarities
Belongs to the SNF2/RAD54 helicase family.
Tissue Specificity
Isoform 1 is expressed ubiquitously. Isoform 3 is expressed mainly in skin and esophagus. Expressed in fibroblasts and keratinocytes (at protein level) (PubMed:29409814).
Cellular localization
- Nucleus
- Chromosome
- Colocalizes with PCNA at replication forks during S phase. Recruited to double-strand breaks (DSBs) sites of DNA damage.
Alternative names
KIAA1122, SMARCAD1, SWI/SNF-related matrix-associated actin-dependent regulator of chromatin subfamily A containing DEAD/H box 1, ATP-dependent helicase 1, hHEL1