rs373483056

Positions:

Variant summary

Our verdict is Likely benign. Variant got -1 ACMG points: 0P and 1B. BP4

The NM_024675.4(PALB2):c.100C>T(p.Arg34Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000378 in 1,613,840 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.000046 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000037 ( 0 hom. )

Consequence

PALB2
NM_024675.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:11B:1

Conservation

PhyloP100: 2.67

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 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -1 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.41391242).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PALB2	NM_024675.4 linkuse as main transcript	c.100C>T	p.Arg34Cys	missense_variant	2/13	ENST00000261584.9	NP_078951.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PALB2	ENST00000261584.9 linkuse as main transcript	c.100C>T	p.Arg34Cys	missense_variant	2/13	1	NM_024675.4	ENSP00000261584	P1

Frequencies

GnomAD3 genomes

AF:

0.0000460

AC:

AN:

152146

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000588

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000159

AC:

AN:

251484

Hom.:

AF XY:

0.0000147

AC XY:

AN XY:

135918

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 SAS exome

AF:

0.0000327

Gnomad FIN exome

AF:

0.0000924

Gnomad NFE exome

AF:

0.00000879

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000369

AC:

AN:

1461576

Hom.:

Cov.:

AF XY:

0.0000371

AC XY:

AN XY:

727110

show subpopulations

Gnomad4 AFR exome

AF:

0.0000896

Gnomad4 AMR exome

AF:

0.0000224

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000252

Gnomad4 SAS exome

AF:

0.0000232

Gnomad4 FIN exome

AF:

0.0000936

Gnomad4 NFE exome

AF:

0.0000360

Gnomad4 OTH exome

AF:

0.0000331

GnomAD4 genome

AF:

0.0000460

AC:

AN:

152264

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74462

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.000131

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000588

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000712

Hom.:

Bravo

AF:

0.0000453

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.0000330

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:11Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Hereditary cancer-predisposing syndrome

Uncertain:4

Uncertain significance, criteria provided, single submitter	clinical testing	Mendelics	Jul 02, 2018	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Ambry Genetics	Aug 23, 2023	The p.R34C variant (also known as c.100C>T), located in coding exon 2 of the PALB2 gene, results from a C to T substitution at nucleotide position 100. The arginine at codon 34 is replaced by cysteine, an amino acid with highly dissimilar properties. In a homology-directed DNA repair (HDR) assay, this alteration was found to be functionally normal (Wiltshire T et al. Genet. Med., 2019 Oct, Boonen et al. Nat. Comms. 2019 Nov). In a PARP inhibitor sensitivity assay, this alteration was found to be functionally normal (Boonen et al. Nat. Comms. 2019 Nov). This variant was reported in 5/60,466 breast cancer cases and in 2/53,461 controls (Dorling et al. N Engl J Med. 2021 02;384:428-439), in 1/7,051 unselected female breast cancer patients and 0/11,241 female controls of Japanese ancestry (Momozawa Y et al. Nat Commun, 2018 10;9:4083), in 1/5589 German BRCA1/2-negative probands with breast cancer (Hauke J et al. Cancer Med, 2018 04;7:1349-1358), and in a cohort of 126 Brazilian index patients who met NCCN clinical criteria for hereditary breast and ovarian cancer syndrome and who previously tested negative for BRCA1/2 mutations (Gomes R et al. Breast Cancer Res Treat, 2021 Feb;185:851-861). This alteration has also been reported in patients with leukemia and pancreatic cancer (Lu C et al. Nat Commun. 2015 Dec 22;6:10086; Hu C et al. Cancer Epidemiol Biomarkers Prev, 2016 Jan;25:207-11). This amino acid position is highly conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -
Uncertain significance, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Dec 28, 2023	This missense variant replaces arginine with cysteine at codon 34 of the PALB2 protein. Computational prediction tool suggests that this variant may not impact protein structure and function. A functional study reported this variant to have normal homology-directed DNA repair activity in PALB2-deficient B400 mouse mammary tumor cells (PMID: 31636395). This variant has been reported in at least six individuals affected with breast cancer (PMID: 26848151, 30287823, 33471991), and one individual each affected with acute myeloid leukemia, stomach adenocarcinoma, pancreatic cancer and colorectal cancer and/or polyps (PMID: 2598075, 26483394, 26689913). This variant also has been reported in at least three healthy individuals including an individual age 70 years or older without cancer in the FLOSSIES database (PMID: 33471991; https://whi.color.com/variant/16-23649399-G-A). This variant has been identified in 5/282890 chromosomes in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance. -
Uncertain significance, criteria provided, single submitter	curation	Sema4, Sema4	Sep 14, 2021	- -

Familial cancer of breast

Uncertain:3Benign:1

Uncertain significance, criteria provided, single submitter	clinical testing	Baylor Genetics	Nov 13, 2023	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Counsyl	Apr 13, 2016	- -
Benign, criteria provided, single submitter	clinical testing	Myriad Genetics, Inc.	Feb 23, 2024	This variant is considered benign. This variant is strongly associated with less severe personal and family histories of cancer, typical for individuals without pathogenic variants in this gene [PMID: 25085752]. This variant has been observed in trans with a known pathogenic variant in one or more individuals lacking clinical features consistent with gene-specific recessive disease. -
Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Dec 30, 2023	This sequence change replaces arginine, which is basic and polar, with cysteine, which is neutral and slightly polar, at codon 34 of the PALB2 protein (p.Arg34Cys). This variant is present in population databases (rs373483056, gnomAD 0.004%). This missense change has been observed in individual(s) with breast cancer, pancreatic cancer, acute myeloid leukemia, stomach adenocarcinoma, and suspected Lynch Syndrome (PMID: 25980754, 26483394, 26689913, 26848151, 30287823, 33128190). ClinVar contains an entry for this variant (Variation ID: 185273). 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 disruptive. Experimental studies have shown that this missense change does not substantially affect PALB2 function (PMID: 31636395). 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. -

not provided

Uncertain:3

Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Jun 14, 2023	Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Published functional study demonstrates homology-directed repair activity similar to wild-type (Wiltshire et al., 2019); Observed in individuals with breast, pancreatic, and other cancers (Hu et al., 2016; Yurgelun et al., 2015; Lu et al., 2015; Decker et al., 2017; Hauke et al., 2018; Momozawa et al., 2018; Gomes et al., 2021); This variant is associated with the following publications: (PMID: 26689913, 26483394, 25980754, 26848151, 29522266, 30287823, 33128190, 33471991, 31636395, 28779002, 20871615, 19369211) -
Uncertain significance, no assertion criteria provided	curation	Leiden Open Variation Database	Oct 10, 2018	Curators: Marc Tischkowitz, Arleen D. Auerbach. Submitter to LOVD: Yukihide Momozawa. -
Uncertain significance, criteria provided, single submitter	clinical testing	Quest Diagnostics Nichols Institute San Juan Capistrano	Aug 06, 2021	- -

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Mar 19, 2022

Variant summary: PALB2 c.100C>T (p.Arg34Cys) results in a non-conservative amino acid change in the encoded protein sequence. Four of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 1.6e-05 in 251484 control chromosomes. The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance. c.100C>T has been reported in the literature as a VUS in settings of multigene cancer panel testing among women with breast/colorectal cancer (example, Yurgelun_2015, Villalona-Calero_2016, Momozawa_2018). These report(s) do not provide unequivocal conclusions about association of the variant with Hereditary Breast And Ovarian Cancer Syndrome. At least one publication reports experimental evidence evaluating an impact on protein function (example, Wiltshire_2019). These results showed no damaging effect of this variant on Homology Directed Repair (HDR) activity. Seven clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. All laboratories classified the variant as uncertain significance. Based on the evidence outlined above, the variant was classified as uncertain significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.59

BayesDel_addAF

Benign

-0.013

BayesDel_noAF

Benign

-0.16

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.51

D;T

Eigen

Pathogenic

0.68

Eigen_PC

Uncertain

0.65

FATHMM_MKL

Uncertain

0.85

LIST_S2

Uncertain

0.94

D;D

M_CAP

Benign

0.026

MetaRNN

Benign

0.41

T;T

MetaSVM

Benign

-0.87

MutationAssessor

Uncertain

2.8

M;.

MutationTaster

Benign

0.99

PrimateAI

Uncertain

0.56

PROVEAN

Pathogenic

-5.3

D;.

REVEL

Benign

0.19

Sift

Pathogenic

0.0

D;.

Sift4G

Pathogenic

0.0010

D;.

Polyphen

1.0

D;.

Vest4

0.65

MVP

0.88

MPC

0.39

ClinPred

0.98

GERP RS

4.5

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.0

Varity_R

0.46

gMVP

0.082

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over