ClinVar

Description

The BARD1 p.Leu359_Pro365del variant was identified in 19 of 926 proband chromosomes (frequency: 0.0205) from individuals or families with hereditary breast and ovarian cancer and was present in 4 of 140 control chromosomes (frequency: 0.03) from healthy individuals, and is reported in the literature as a polymorphism (De Brakeleer 2010, De Brakeleer 2015, Ishitobi 2003, Liu 2017, Irminger-Finger 2015). The variant was also identified in ClinVar as benign (by Ambry Genetics, GeneDx, Invitae, and Counsyl), and the Zhejiang Colon Cancer Database. The variant was not identified in Cosmic, and MutDB databases. The variant was identified in control databases in 7807 of 277012 chromosomes at a frequency of 0.03 increasing the likelihood this could be a low frequency benign variant (Genome Aggregation Consortium Feb 27, 2017). The variant was identified in the following populations at a frequency greater than 1%: South Asian (52 homozygous) in 2152 of 30774 chromosomes (freq: 0.07), East Asian (8 homozygous) in 834 of 18854 chromosomes (freq: 0.044), African (9 homozygous) in 986 of 24026 chromosomes (freq: 0.041), Latino (2 homozygous) in 1167 of 34380 chromosomes (freq: 0.034), Other in 209 of 6462 chromosomes (freq: 0.032), European (Non-Finnish) in 2254 of 126574 chromosomes (freq: 0.018), Ashkenazi Jewish in 118 of 10152 chromosomes (freq: 0.012). This variant is an in-frame deletion resulting in the removal of a 7 amino acid residues from codon 359 to 365; the impact of this alteration on BARD1 protein function is not known. The variant occurs outside of the splicing consensus sequence and in silico or computational prediction software programs (SpliceSiteFinder, MaxEntScan, NNSPLICE, GeneSplicer, HumanSpliceFinder) do not predict a difference in splicing. In summary, based on the above information this variant meets our laboratory's criteria to be classified as benign.