rs730881868

Variant names:

• chr16-23626338-A-ACAAC
• rs730881868
• NM_024675.4:c.2642_2645dupGTTG

Variant summary

Our verdict is Pathogenic. The variant received 22 ACMG points: 22P and 0B. PVS1 PS3 PM2 PP5_Very_Strong

The NM_024675.4(PALB2):​c.2642_2645dupGTTG​(p.Cys882TrpfsTer3) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★★). ClinVar reports functional evidence for this variant: "SCV001348385: "A functional study has reported that this variant results in the loss of PALB2 function in homology-directed repair and resistance to PARP inhibitor assays (PMID:31757951)."" and additional evidence is available in ClinVar. Variant results in nonsense mediated mRNA decay. The gene PALB2 is included in the ClinGen Criteria Specification Registry.

• Frequency: Genomes: not found (cov: 32)
• Consequence: PALB2 NM_024675.4 frameshift
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:9
• Conservation: PhyloP100: -0.622
• Publications: 3 publications found

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: Ambry Genetics
• PALB2-related cancer predisposition

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• Fanconi anemia complementation group N

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), ClinGen, G2P
• pancreatic cancer, susceptibility to, 3

  Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae), Genomics England PanelApp
• Fanconi anemia

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Specifications for PALB2 are available in the ClinGen Criteria Specification Registry and recommended for reference when assigning criteria.

Our verdict: Pathogenic. The variant received 22 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PS3: PS3 evidence extracted from ClinVar submissions: SCV001348385: "A functional study has reported that this variant results in the loss of PALB2 function in homology-directed repair and resistance to PARP inhibitor assays (PMID: 31757951)."; SCV000211478: Published functional studies demonstrate a damaging effect: deficient homologous recombination efficiency and PARP inhibitor resistance (Boonen et al., 2019); SCV002556280: In a functional study the variant displayed strong defects in homologous recombination, reducing its repair efficiency to approximately 6% of that of wildtype PALB2 (Boonen_2019).; SCV005337559: Functional studies have demonstrated that this variant results in loss of PALB2 homology directed repair and resistance to PARP inhibitor assays (Boonen et al. 2019. PubMed ID: 31757951).
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 16-23626338-A-ACAAC is Pathogenic according to our data. Variant chr16-23626338-A-ACAAC is described in ClinVar as Pathogenic. ClinVar VariationId is 182741.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_024675.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PALB2	NM_024675.4	MANE Select	c.2642_2645dupGTTG	p.Cys882TrpfsTer3	frameshift	Exon 7 of 13	NP_078951.2
	PALB2	NM_001407296.1		c.2582_2585dupGTTG	p.Cys862TrpfsTer3	frameshift	Exon 6 of 12	NP_001394225.1
	PALB2	NM_001407297.1		c.2570_2573dupGTTG	p.Cys858TrpfsTer3	frameshift	Exon 6 of 12	NP_001394226.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PALB2	ENST00000261584.9	TSL:1 MANE Select	c.2642_2645dupGTTG	p.Cys882TrpfsTer3	frameshift	Exon 7 of 13	ENSP00000261584.4	Q86YC2
	PALB2	ENST00000568219.5	TSL:1	c.1757_1760dupGTTG	p.Cys587TrpfsTer3	frameshift	Exon 7 of 13	ENSP00000454703.2	H3BN63
	PALB2	ENST00000561514.3	TSL:5	c.2648_2651dupGTTG	p.Cys884TrpfsTer3	frameshift	Exon 7 of 13	ENSP00000460666.3	A0AA52I2C1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
3	-	-	Familial cancer of breast (3)
2	-	-	Hereditary cancer-predisposing syndrome (2)
2	-	-	not provided (2)
1	-	-	Malignant tumor of breast (1)
1	-	-	PALB2-related disorder (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		-0.62
Mutation Taster		=0/200	disease causing (ClinVar)

Splicing

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

Other links and lift over

dbSNP: rs730881868; hg19: chr16-23637659;