NM_024675.4:c.3426_3429delACTT

Variant names:

Variant summary

Our verdict is Pathogenic. The variant received 18 ACMG points: 18P and 0B. PVS1PM2PP5_Very_Strong

The NM_024675.4(PALB2):c.3426_3429delACTT(p.Leu1142PhefsTer20) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,882 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Pathogenic (★★).

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

PALB2
NM_024675.4 frameshift

Scores

Not classified

Clinical Significance

Pathogenic criteria provided, multiple submitters, no conflicts P:9

Conservation

PhyloP100: 3.27

Publications

3 publications found

Variant links:

Genes affected

PALB2 (HGNC:26144): (partner and localizer of BRCA2) This gene encodes a protein that may function in tumor suppression. This protein binds to and colocalizes with the breast cancer 2 early onset protein (BRCA2) in nuclear foci and likely permits the stable intranuclear localization and accumulation of BRCA2. [provided by RefSeq, Jul 2008]

PALB2 Gene-Disease associations (from GenCC):

hereditary breast carcinoma
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen, Ambry Genetics
Fanconi anemia complementation group N
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae), ClinGen, Ambry Genetics
pancreatic cancer, susceptibility to, 3
Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp, Labcorp Genetics (formerly Invitae)
familial ovarian cancer
Inheritance: AD Classification: MODERATE Submitted by: ClinGen
Fanconi anemia
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
hereditary nonpolyposis colon cancer
Inheritance: AD Classification: LIMITED Submitted by: ClinGen

PALB2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Pathogenic. The variant received 18 ACMG points.

PVS1

Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most exon, not predicted to undergo nonsense mediated mRNA decay. There are 44 pathogenic variants in the truncated region.

PM2

Very rare variant in population databases, with high coverage;

PP5

Variant 16-23603590-GAAGT-G is Pathogenic according to our data. Variant chr16-23603590-GAAGT-G is described in ClinVar as Pathogenic. ClinVar VariationId is 185799.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PALB2	NM_024675.4 link	c.3426_3429delACTT	p.Leu1142PhefsTer20	frameshift_variant	Exon 13 of 13	ENST00000261584.9	NP_078951.2	Q86YC2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PALB2	ENST00000261584.9 link	c.3426_3429delACTT	p.Leu1142PhefsTer20	frameshift_variant	Exon 13 of 13	1	NM_024675.4	ENSP00000261584.4		Q86YC2

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.00000398

AC:

AN:

251470

AF XY:

0.00000736

show subpopulations

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 FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000879

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461882

Hom.:

AF XY:

0.00000138

AC XY:

AN XY:

727244

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33480

American (AMR)

AF:

0.00

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39698

South Asian (SAS)

AF:

0.00

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53418

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

8.99e-7

AC:

AN:

1112004

Other (OTH)

AF:

0.00

AC:

AN:

60396

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.525

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:9

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Pathogenic:4

Oct 06, 2023

Quest Diagnostics Nichols Institute San Juan Capistrano

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The PALB2 c.3426_3429del (p.Leu1142Phefs*20) variant alters the translational reading frame of the PALB2 mRNA and causes the premature termination of PALB2 protein synthesis. This variant has been reported in the published literature in affected individuals with breast cancer (PMIDs: 25099575 (2014) and 30287823 (2018)), osteosarcoma (PMID: 32191290 (2020)), and in an individual with a family history of pancreatic cancer (PMID: 34399810 (2021)). Based on the available information, this variant is classified as pathogenic. -

Feb 28, 2020

Leiden Open Variation Database

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:curation

Curators: Marc Tischkowitz, Arleen D. Auerbach. Submitter to LOVD: Yukihide Momozawa. -

Jan 10, 2023

GeneDx

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Frameshift variant predicted to result in protein truncation or nonsense mediated decay in a gene for which loss of function is a known mechanism of disease; Not observed at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 25099575, 30287823, 30128536, 34196900, 34399810, 29922827) -

SNPedia

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:literature only

- -

Familial cancer of breast

Pathogenic:3

Dec 28, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change creates a premature translational stop signal (p.Leu1142Phefs*20) in the PALB2 gene. While this is not anticipated to result in nonsense mediated decay, it is expected to disrupt the last 45 amino acid(s) of the PALB2 protein. This variant is present in population databases (rs751415161, gnomAD 0.0009%). This premature translational stop signal has been observed in individual(s) with a personal and/or family history of breast cancer (PMID: 25099575). This variant is also known as c.3423_3426del. ClinVar contains an entry for this variant (Variation ID: 185799). This variant disrupts a region of the PALB2 protein in which other variant(s) (p.Tyr1183*) have been determined to be pathogenic (PMID: 17200671). This suggests that this is a clinically significant region of the protein, and that variants that disrupt it are likely to be disease-causing. For these reasons, this variant has been classified as Pathogenic. -

May 13, 2019

Leiden Open Variation Database

Significance:Pathogenic

Review Status:flagged submission

Collection Method:curation

Curators: Marc Tischkowitz, Arleen D. Auerbach. Submitter to LOVD: Marc Tischkowitz. -

Sep 15, 2023

Myriad Genetics, Inc.

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant is considered pathogenic. This variant creates a frameshift predicted to result in premature protein truncation. -

Breast-ovarian cancer, familial, susceptibility to, 5

Pathogenic:1

Apr 03, 2024

KCCC/NGS Laboratory, Kuwait Cancer Control Center

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change creates a premature translational stop signal (p.Leu1142Phefs*20) in the PALB2 gene. While this is not anticipated to result in nonsense mediated decay, it is expected to disrupt the last 45 amino acid(s) of the PALB2 protein. This variant Not observed at significant frequency in large population cohorts (gnomAD). This premature translational stop signal has been observed in individual(s) with a personal and/or family history of breast cancer (PMID: 25099575, 30287823, 30128536, 34196900, 34399810, 29922827). This variant is also known as c.3423_3426del. ClinVar contains an entry for this variant (Variation ID: 185799). This variant disrupts a region of the PALB2 protein in which other variant(s) (p.Tyr1183*) have been determined to be pathogenic (PMID: 17200671). This suggests that this is a clinically significant region of the protein, and that variants that disrupt it are likely to be disease-causing. For these reasons, this variant has been classified as Pathogenic. -

Hereditary cancer-predisposing syndrome

Pathogenic:1

Nov 21, 2024

Ambry Genetics

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.3426_3429delACTT pathogenic mutation, located in coding exon 13 of the PALB2 gene, results from a deletion of 4 nucleotides at nucleotide positions 3426 to 3429, causing a translational frameshift with a predicted alternate stop codon (p.L1142Ffs*20). This alteration occurs at the 3' terminus of thePALB2 gene, is not expected to trigger nonsense-mediated mRNA decay, and only impacts the last 3.8% of the protein. However, premature stop codons are typically deleterious in nature and the impacted region is critical for protein function (Ambry internal data). This mutation (designated c.3423_3426del) was identified in a series of breast cancer families (Antoniou AC et al. N Engl J Med, 2014 Aug;371:497-506). This alteration was observed with an allele frequency of 0.00014 in 7,051 unselected female breast cancer patients and was observed with an allele frequency of 0 in 11,241 female controls of Japanese ancestry; this alteration was not observed in male patients or controls in this study (Momozawa Y et al. Nat Commun, 2018 Oct;9:4083). This variant is considered to be rare based on population cohorts in the Genome Aggregation Database (gnomAD). Based on the supporting evidence, this variant is interpreted as a disease-causing mutation. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

PhyloP100

3.3

Mutation Taster

=5/195

disease causing (ClinVar)

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over