16-68738289-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.49-8C>T variant causes a splice region, splice polypyrimidine tract, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000261 in 1,380,112 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: not found (cov: 32)
  • Exomes 𝑓: 0.000026 (0 hom.)
• Consequence: CDH1 NM_004360.5 splice_region, splice_polypyrimidine_tract, intron
• Scores: Splicing: ADA: 0.00008907
• Clinical Significance: Likely benign reviewed by expert panel U:1 B:4
• Conservation: PhyloP100: -0.714

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=-0.76).
• BP6: Variant 16-68738289-C-T is Benign according to our data. Variant chr16-68738289-C-T is described in ClinVar as [Likely_benign]. Clinvar id is 387465.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.49-8C>T		splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant		ENST00000261769.10
CDH1	NM_001317184.2	c.49-8C>T		splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant
CDH1	NM_001317185.2	c.-1567-8C>T		splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant
CDH1	NM_001317186.2	c.-1771-8C>T		splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CDH1	ENST00000261769.10	c.49-8C>T		splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant		1	NM_004360.5	P1
CDH1	ENST00000422392.6	c.49-8C>T		splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant		1
CDH1	ENST00000566612.5	c.49-8C>T		splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant, NMD_transcript_variant		1
CDH1	ENST00000566510.5	c.49-8C>T		splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant, NMD_transcript_variant		5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.0000128 AC: 2 AN: 156612 Hom.: 0 AF XY: 0.0000242 AC XY: 2 AN XY: 82622

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: 0.0000332

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000261 AC: 36 AN: 1380112 Hom.: 0 Cov.: 28 AF XY: 0.0000264 AC XY: 18 AN XY: 682008

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: 0.0000339

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Significance: Likely benign

Submissions summary: Uncertain:1 Benign:4

Revision: reviewed by expert panel

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Quest Diagnostics Nichols Institute San Juan Capistrano

Nov 28, 2016

- -

Hereditary diffuse gastric adenocarcinoma Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Invitae

Jan 11, 2024

- -

not provided Benign:1

Likely benign, criteria provided, single submitter

clinical testing

GeneDx

Jun 03, 2020

- -

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 17, 2023

The c.49-8C>T is an intronic variant in the splice acceptor region of intron 1. This variant has an allele frequency of 0.00001 (2/150178) in gnomAD with a maximum frequency of 0.00003 (2/57282) in the European (Non-Finnish) sub-population. This variant has been reported in at least 12 individuals without DGC, SRC tumours or LBC and whose families do not suggest HDGC (BS2; SCV000529519.4, SCV000557406.3). This variant is predicted to have no impact on splicing by multiple in silico splice site predictors. HumanSpliceFinder predicts that this variant may create an exonic ESS site, but this effect has not been demonstrated experimentally to our knowledge (BP4). In summary, this variant meets criteria to be classified as likely benign based on ACMG/AMP criteria applied as specified by the CDH1 Variant Curation Expert Panel (Variant Interpretation Guidelines Version 3.1): BS2, BP4. -

Hereditary cancer-predisposing syndrome Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Color Diagnostics, LLC DBA Color Health

Mar 20, 2018

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.76
Cadd	Benign	6.2
Dann	Benign	0.93

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.000089
dbscSNV1_RF	Benign	0.0
SpliceAI score (max)		0.090		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: rs774761552; hg19: chr16-68772192;