ClinVar

Description

The CDH1 p.Gly879Ser variant was identified in 4 of 16,822 proband chromosomes (frequency: 0.0002) from individuals or families with breast cancer or lynch syndrome and was present in 1 of 47,462 control chromosomes (frequency: 0.00002) from healthy individuals (Momozawa 2018, Yurgelun 2015, Valente 2014). The variant was identified in dbSNP (rs200911775) as ‚ with other allele‚Äù and ClinVar (classified as uncertain significance by ClinGen CDH1 Curation Panel, Invitae, Color and 1 other submitter; and as likely benign by Ambry Genetics, GeneDx and Integrated Genetics). The variant was identified in control databases in 37 of 282,800 chromosomes at a frequency of 0.0001 (Genome Aggregation Database Feb 27, 2017). The variant was observed in the following populations: Other in 2 of 7218 chromosomes (freq: 0.0003), European in 32 of 129,134 chromosomes (freq: 0.0002), African in 1 of 24,964 chromosomes (freq: 0.00004), Finnish in 1 of 25,106 chromosomes (freq: 0.00004), and Latino in 1 of 35,440 chromosomes (freq: 0.00003); it was not observed in the Ashkenazi Jewish, East Asian or South Asian populations. The p.Gly879 residue is conserved in mammals and computational analyses (PolyPhen-2, SIFT, AlignGVGD, BLOSUM, MutationTaster) provide inconsistent predictions regarding the impact to the protein; this information is not very predictive of pathogenicity. The variant occurs outside of the splicing consensus sequence and in silico or computational prediction software programs (SpliceSiteFinder, MaxEntScan, NNSPLICE, GeneSplicer) do not predict a 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.