BRCA1-Interacting Protein

Alternative Names

  • BRIP1
  • BRCA1-Associated C-Terminal Helicase 1
  • BACH1
  • Deletions of Guanine-Rich DNA, C. Elegans, Homolog of
  • DOG1, Homolog of
  • FANCJ Gene
  • FANCJ
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OMIM Number

605882

NCBI Gene ID

83990

Uniprot ID

Q9BX63

Length

184,982 bases

No. of Exons

25

No. of isoforms

2

Protein Name

Fanconi anemia group J protein

Molecular Mass

140867 Da

Amino Acid Count

1249

Genomic Location

chr17:61,679,139-61,864,120

Gene Map Locus
17q23.2

Description

Helicases play an important role in DNA replication as they bind and unwind double stranded DNA into single strands. BRIP1 gene encodes a protein belonging to the RecQ DEAH helicase family and thus functions as a 5’ to 3’ DNA helicase as well as a DNA dependent ATPase.  It interacts with BRCA1 to repair DNA double strand breaks.

Mutations in the BRIP1 gene impair its ability to repair DNA.  This results in a build-up of inter-strand crosslinks ultimately stalling DNA replication and triggering either abnormal cell death or uncontrolled cell growth. Abnormal cell death leads to the loss of blood cells and manifests as Fanconi anaemia while uncontrolled cell growth develops into cancers.  Germline mutations in the BRIP1 gene are associated with early-onset breast cancer.  These are usually inactivating truncating mutations and are monoallelic.  Mutations resulting in Fanconi anaemia are either homozygous or compound heterozygous in nature.

Epidemiology in the Arab World

View Map
Variant NameCountryGenomic LocationClinvar Clinical SignificanceCTGA Clinical Significance Condition(s)HGVS ExpressionsdbSNPClinvar
NM_007300.3:c.4358-2A>TUnited Arab EmiratesNC_000017.11:g.43079401T>ANG_005905.2:g.138583A>T; NM_007300.3:c.4358-2A>T; NP_009231.2:p.?
NM_032043.3:c.2220G>TLebanonchr17:61744469Likely BenignLikely PathogenicBreast CancerNG_007409.2:g.124091G>T; NM_032043.3:c.2220G>T; NP_114432.2:p.Gln740His45589637133752
NM_032043.3:c.3571A>GLebanonchr17:61683475Likely BenignUncertain SignificanceBreast CancerNG_007409.2:g.185085A>G; NM_032043.3:c.3571A>G; NP_114432.2:p.Ile1191Val761405340186989

Other Reports

Saudi Arabia

Ghazwani et al. (2016) investigated the genetic mutations affecting 10 Fanconi anaemia (FA) patients in a Saudi Arabian hospital.  All patients were from consanguineous families and of Saudi origin.  Four patients, 2 girls aged 4 and 6; and 2 boys aged 8 and 10, were from four different Saudi tribes.  They all suffered from microcephaly, growth retardation, café au lait spots, hypopigmentation and kidney abnormalities. They were all diagnosed with severe aplastic anaemia. However, none of the four patients had any malignancies or a family history of cancer.  These patients were found to have a mutation in the BRIP1 gene.  The detected mutation, a homozygous c.2392C>T transition resulting in p.Arg798*, was not found in 50 ethnically-matched non-FA controls but has been previously reported in FA patients of other ethnic groups.  The authors also specified that in comparison to European FA patients, most Saudi mutations were in downstream FA pathway genes.  Thus the FANCD2 monoubiquitination assay, used to screen eight genes involved in FANCD2/FANCI monoubiquitination, was considered an ineffectual diagnostic tool for Saudi FA cases. 

United Arab Emirates

In a retrospective study of breast cancer patients in the UAE, Altinoz et al (2020) identified an Emirati patients with pathogenic variants in the BRIP1 gene. An additional Emirati patient was found to have a variant of uncertain significance in the same gene.

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