ClinVar

Description

The RAD51C p.Lys235Asn variant was not identified in the literature nor was it identified in the Cosmic, MutDB, LOVD 3.0, databases. The variant was identified in dbSNP (ID: rs755849719) as “With Uncertain significance allele”, and in ClinVar (2x as uncertain significance by Invitae and Ambry Genetics). The variant was identified in control databases in 1 of 245846 chromosomes at a frequency of 0.000004 (Genome Aggregation Database Feb 27, 2017). The variant was identified in the European Non-Finnish population in 1 of 111564 chromosomes (freq: 0.000009), while the variant was not observed in the African, Other, Latino, Ashkenazi Jewish, East Asian, Finnish, and South Asian populations. The p.Lys235 residue is conserved in mammals but not in more distantly related organisms however four out of five computational analyses (PolyPhen-2, SIFT, AlignGVGD, BLOSUM, MutationTaster) do not suggest a high likelihood of impact to the protein; this information is not predictive enough to rule out pathogenicity. The p.Lys235Asn variant occurs in the last three bases of the exon. This position has been shown to be part of the splicing consensus sequence and variants involving this position sometimes affect splicing. In addition, 5 of 5 in silico or computational prediction software programs (SpliceSiteFinder, MaxEntScan, NNSPLICE, GeneSplicer, HumanSpliceFinder) predict a greater than 10% difference in splicing. In summary, based on the above information the clinical significance of this variant cannot be determined with certainty at this time. This variant is classified as a variant of uncertain significance.