chr16-68801729-T-C

Position:

• chr16-68801729-T-C

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 1P and 4B. BS2 PM2_Supporting

This summary comes from the ClinGen Evidence Repository: The c.223T>C (p.Phe75Leu) missense variant has a frequency of 0.000003977 (1 of 251,418) in the gnomAD v2.1.1 cohort, with a maximum non-founder allele frequency of 0.000008795 (1 of 113,700) in the Non-Finnish European population (PM2_Supporting; http://gnomad.broadinstitute.org). This variant has been observed in ≥10 individuals without DGC, SRC tumours or LBC and whose families do not suggest HDGC (BS2). In summary, the clinical significance of this variant is classified as of likely benign based the ACMG/AMP criteria applied, as specified by the CDH1 Variant Curation Expert Panel (Variant Interpretation Guidelines Version 3.1): PM2_supporting, BS2. LINK:https://erepo.genome.network/evrepo/ui/classification/CA167218/MONDO:0007648/007

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: CDH1 NM_004360.5 missense
• Clinical Significance: Likely benign reviewed by expert panel U:2 B:2
• Conservation: PhyloP100: 1.88

Genes affected

CDH1 (HGNC:1748): (cadherin 1) This gene encodes a classical cadherin of the cadherin superfamily. Alternative splicing results in multiple transcript variants, at least one of which encodes a preproprotein that is proteolytically processed to generate the mature glycoprotein. This calcium-dependent cell-cell adhesion protein is comprised of five extracellular cadherin repeats, a transmembrane region and a highly conserved cytoplasmic tail. Mutations in this gene are correlated with gastric, breast, colorectal, thyroid and ovarian cancer. Loss of function of this gene is thought to contribute to cancer progression by increasing proliferation, invasion, and/or metastasis. The ectodomain of this protein mediates bacterial adhesion to mammalian cells and the cytoplasmic domain is required for internalization. This gene is present in a gene cluster with other members of the cadherin family on chromosome 16. [provided by RefSeq, Nov 2015]

CDH1 (HGNC:):

ACMG classification

Verdict is Likely_benign. Variant got -3 ACMG points.

• PM2: For more information check the summary or visit ClinGen Evidence Repository.
• BS2: For more information check the summary or visit ClinGen Evidence Repository.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CDH1	NM_004360.5	c.223T>C	p.Phe75Leu	missense_variant	3/16	ENST00000261769.10	NP_004351.1
CDH1	NM_001317184.2	c.223T>C	p.Phe75Leu	missense_variant	3/15		NP_001304113.1
CDH1	NM_001317185.2	c.-1393T>C		5_prime_UTR_variant	3/16		NP_001304114.1
CDH1	NM_001317186.2	c.-1597T>C		5_prime_UTR_variant	3/15		NP_001304115.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CDH1	ENST00000261769.10	c.223T>C	p.Phe75Leu	missense_variant	3/16	1	NM_004360.5	ENSP00000261769.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000398 AC: 1 AN: 251418 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 135882

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000880

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461878 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 727244

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 8.99e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000468 Hom.: 0

ClinVar

Significance: Likely benign

Submissions summary: Uncertain:2 Benign:2

Revision: reviewed by expert panel

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Quest Diagnostics Nichols Institute San Juan Capistrano

Apr 01, 2021

- -

Hereditary diffuse gastric adenocarcinoma Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Aug 07, 2023

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be tolerated. ClinVar contains an entry for this variant (Variation ID: 142040). This missense change has been observed in individual(s) with breast cancer (PMID: 31871109). This variant is present in population databases (rs587782193, gnomAD 0.0009%). This sequence change replaces phenylalanine, which is neutral and non-polar, with leucine, which is neutral and non-polar, at codon 75 of the CDH1 protein (p.Phe75Leu). -

CDH1-related diffuse gastric and lobular breast cancer syndrome Benign:1

Likely benign, reviewed by expert panel

curation

ClinGen CDH1 Variant Curation Expert Panel

Aug 18, 2023

The c.223T>C (p.Phe75Leu) missense variant has a frequency of 0.000003977 (1 of 251,418) in the gnomAD v2.1.1 cohort, with a maximum non-founder allele frequency of 0.000008795 (1 of 113,700) in the Non-Finnish European population (PM2_Supporting; http://gnomad.broadinstitute.org). This variant has been observed in at least 10 individuals without DGC, SRC tumours or LBC and whose families do not suggest HDGC (BS2). In summary, the clinical significance of this variant is classified as of likely benign based the ACMG/AMP criteria applied, as specified by the CDH1 Variant Curation Expert Panel (Variant Interpretation Guidelines Version 3.1): PM2_supporting, BS2. -

Hereditary cancer-predisposing syndrome Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Feb 09, 2016

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.94
BayesDel_addAF	Uncertain	0.064	T
BayesDel_noAF	Benign	-0.15
CADD	Benign	22
DANN	Uncertain	0.99
DEOGEN2	Benign	0.31	T;T;T;.;.
Eigen	Benign	0.099
Eigen_PC	Benign	0.19
FATHMM_MKL	Uncertain	0.82	D
LIST_S2	Benign	0.78	T;T;T;T;T
M_CAP	Uncertain	0.20	D
MetaRNN	Pathogenic	0.79	D;D;D;D;D
MetaSVM	Uncertain	0.011	D
MutationAssessor	Uncertain	2.9	M;.;.;.;M
PrimateAI	Uncertain	0.55	T
PROVEAN	Uncertain	-3.8	D;.;.;.;D
REVEL	Uncertain	0.51
Sift	Uncertain	0.021	D;.;.;.;D
Sift4G	Uncertain	0.059	T;T;T;T;T
Polyphen		0.050	B;.;.;.;.
Vest4		0.46
MutPred		0.85		Loss of methylation at K76 (P = 0.0302);Loss of methylation at K76 (P = 0.0302);Loss of methylation at K76 (P = 0.0302);Loss of methylation at K76 (P = 0.0302);Loss of methylation at K76 (P = 0.0302);
MVP		0.92
MPC		0.32
ClinPred		0.94	D
GERP RS		4.3
Varity_R		0.28
gMVP		0.66

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs587782193; hg19: chr16-68835632;