16-23635555-C-G

Variant names:

• chr16-23635555-C-G
• rs878855126
• NM_024675.4:c.991G>C

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 4P and 2B. PM1 PM2 BP4_Moderate

The NM_024675.4(PALB2):​c.991G>C​(p.Glu331Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000205 in 1,460,662 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. E331A) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: PALB2 NM_024675.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:6
• Conservation: PhyloP100: 0.523
• Publications: 2 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

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM1: In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 11 benign, 30 uncertain in NM_024675.4
• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.15902898).

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.991G>C	p.Glu331Gln	missense	Exon 4 of 13	NP_078951.2
	PALB2	NM_001407296.1		c.931G>C	p.Glu311Gln	missense	Exon 3 of 12	NP_001394225.1
	PALB2	NM_001407297.1		c.991G>C	p.Glu331Gln	missense	Exon 4 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.991G>C	p.Glu331Gln	missense	Exon 4 of 13	ENSP00000261584.4	Q86YC2
	PALB2	ENST00000568219.5	TSL:1	c.106G>C	p.Glu36Gln	missense	Exon 4 of 13	ENSP00000454703.2	H3BN63
	PALB2	ENST00000561514.3	TSL:5	c.997G>C	p.Glu333Gln	missense	Exon 4 of 13	ENSP00000460666.3	A0AA52I2C1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000205 AC: 3 AN: 1460662 Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1 AN XY: 726626

African (AFR) AF: 0.00 AC: 0 AN: 33314

American (AMR) AF: 0.00 AC: 0 AN: 44522

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26112

East Asian (EAS) AF: 0.00 AC: 0 AN: 39688

South Asian (SAS) AF: 0.00 AC: 0 AN: 86150

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53374

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5764

European-Non Finnish (NFE) AF: 0.00000270 AC: 3 AN: 1111414

Other (OTH) AF: 0.00 AC: 0 AN: 60324

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000312 Hom.: 0

Bravo AF: 0.00000378

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	3	-	Hereditary cancer-predisposing syndrome (3)
-	2	-	Familial cancer of breast (2)
-	1	-	not provided (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.13
BayesDel_addAF	Benign	-0.30	T
BayesDel_noAF	Benign	-0.67
CADD	Benign	16
DANN	Uncertain	0.99
DEOGEN2	Benign	0.031	T
Eigen	Benign	-0.038
Eigen_PC	Benign	-0.17
FATHMM_MKL	Benign	0.49	N
LIST_S2	Benign	0.80	T
M_CAP	Benign	0.012	T
MetaRNN	Benign	0.16	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.7	L
PhyloP100		0.52
PrimateAI	Benign	0.30	T
PROVEAN	Benign	-1.2	N
REVEL	Benign	0.066
Sift	Benign	0.054	T
Sift4G	Benign	0.082	T
Polyphen		0.98	D
Vest4		0.23
MutPred		0.15		Loss of catalytic residue at E331 (P = 0.1254)
MVP		0.46
MPC		0.24
ClinPred		0.56	D
GERP RS		4.2
Varity_R		0.074
gMVP		0.28

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

Other links and lift over

dbSNP: rs878855126; hg19: chr16-23646876;