16-68737468-C-T

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 0P and 12B. BP4_Strong BP6_Very_Strong

The NM_004360.5(CDH1):c.48+5C>T variant causes a splice donor 5th base, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000156 in 1,537,514 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Likely benign (★★★).

• Frequency:
  • Genomes: 𝑓 0.000020 (0 hom., cov: 33)
  • Exomes 𝑓: 0.000015 (0 hom.)
• Consequence: CDH1 NM_004360.5 splice_donor_5th_base, intron
• Scores: Splicing: ADA: 0.00007240
• Clinical Significance: Likely benign reviewed by expert panel U:1 B:4
• Conservation: PhyloP100: -0.430

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]

ACMG classification

Verdict is Benign. Variant got -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.78).
• BP6: Variant 16-68737468-C-T is Benign according to our data. Variant chr16-68737468-C-T is described in ClinVar as [Likely_benign]. Clinvar id is 491543.Status of the report is reviewed_by_expert_panel, 3 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CDH1	NM_004360.5	c.48+5C>T		splice_donor_5th_base_variant, intron_variant		ENST00000261769.10
CDH1	NM_001317184.2	c.48+5C>T		splice_donor_5th_base_variant, intron_variant
CDH1	NM_001317185.2	c.-1568+5C>T		splice_donor_5th_base_variant, intron_variant
CDH1	NM_001317186.2	c.-1772+5C>T		splice_donor_5th_base_variant, intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CDH1	ENST00000261769.10	c.48+5C>T		splice_donor_5th_base_variant, intron_variant		1	NM_004360.5	P1
CDH1	ENST00000422392.6	c.48+5C>T		splice_donor_5th_base_variant, intron_variant		1
CDH1	ENST00000566612.5	c.48+5C>T		splice_donor_5th_base_variant, intron_variant, NMD_transcript_variant		1
CDH1	ENST00000566510.5	c.48+5C>T		splice_donor_5th_base_variant, intron_variant, NMD_transcript_variant		5

Frequencies

GnomAD3 genomes AF: 0.0000197 AC: 3 AN: 152200 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000620

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.0000228 AC: 3 AN: 131340 Hom.: 0 AF XY: 0.0000276 AC XY: 2 AN XY: 72348

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: 0.000135

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000152 AC: 21 AN: 1385314 Hom.: 0 Cov.: 30 AF XY: 0.0000234 AC XY: 16 AN XY: 684236

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: 0.000252

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.0000173

GnomAD4 genome AF: 0.0000197 AC: 3 AN: 152200 Hom.: 0 Cov.: 33 AF XY: 0.0000403 AC XY: 3 AN XY: 74354

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000620

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00

ClinVar

Significance: Likely benign

Submissions summary: Uncertain:1 Benign:4

Revision: reviewed by expert panel

Submissions by phenotype

Hereditary cancer-predisposing syndrome Benign:2

Likely benign, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Oct 07, 2016	- -
Likely benign, criteria provided, single submitter	clinical testing	Ambry Genetics	Nov 03, 2021	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. -

Hereditary diffuse gastric adenocarcinoma Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Nov 07, 2022

This variant is present in population databases (rs77312180, gnomAD 0.009%). This sequence change falls in intron 1 of the CDH1 gene. It does not directly change the encoded amino acid sequence of the CDH1 protein. It affects a nucleotide within the consensus splice site. This variant has not been reported in the literature in individuals affected with CDH1-related conditions. 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. Variants that disrupt the consensus splice site are a relatively common cause of aberrant splicing (PMID: 17576681, 9536098). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant is not likely to affect RNA splicing. ClinVar contains an entry for this variant (Variation ID: 491543). -

not specified Benign:1

Likely benign, criteria provided, single submitter

clinical testing

GeneDx

Apr 19, 2017

This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

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.48+5C>T variant was observed in at least 3 families without a personal and/or family history of diffuse gastric cancer, lobular breast cancer or a signet ring cell tumor (BP2_Supporting; internal data). There are at least 3 in silico predictors in agreement that this variant does not affect splicing (BP4). Therefore, this variant meets criteria to be classified as likely benign. ACMG/AMP criteria applied, as specified by the CDH1 Variant Curation Expert Panel (Variant Interpretation Guidelines Version 3.1): BS2_Supporting, BP4. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.78
Cadd	Benign	7.6
Dann	Benign	0.94

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.000072
dbscSNV1_RF	Benign	0.058
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: rs77312180; hg19: chr16-68771371;