chr12-132639183-G-A

Position:

• chr12-132639183-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 4P and 1B. PM2 PP3_Moderate BP6

The NM_006231.4(POLE):​c.5494C>T​(p.Leu1832Phe) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. L1832P) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: POLE NM_006231.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2 B:1
• Conservation: PhyloP100: 8.08

Genes affected

POLE (HGNC:9177): (DNA polymerase epsilon, catalytic subunit) This gene encodes the catalytic subunit of DNA polymerase epsilon. The enzyme is involved in DNA repair and chromosomal DNA replication. Mutations in this gene have been associated with colorectal cancer 12 and facial dysmorphism, immunodeficiency, livedo, and short stature. [provided by RefSeq, Sep 2013]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.937
• BP6: Variant 12-132639183-G-A is Benign according to our data. Variant chr12-132639183-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 540670.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=1, Uncertain_significance=2}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
POLE	NM_006231.4	c.5494C>T	p.Leu1832Phe	missense_variant	40/49	ENST00000320574.10
POLE	XM_011534795.4	c.5494C>T	p.Leu1832Phe	missense_variant	40/48
POLE	XM_011534797.4	c.4573C>T	p.Leu1525Phe	missense_variant	32/40
POLE	XM_011534802.4	c.2482C>T	p.Leu828Phe	missense_variant	16/24

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
POLE	ENST00000320574.10	c.5494C>T	p.Leu1832Phe	missense_variant	40/49	1	NM_006231.4	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2 Benign:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Sep 11, 2023

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. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt POLE protein function. ClinVar contains an entry for this variant (Variation ID: 540670). This variant has not been reported in the literature in individuals affected with POLE-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces leucine, which is neutral and non-polar, with phenylalanine, which is neutral and non-polar, at codon 1832 of the POLE protein (p.Leu1832Phe). -

Hereditary cancer-predisposing syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jan 13, 2022

The p.L1832F variant (also known as c.5494C>T), located in coding exon 40 of the POLE gene, results from a C to T substitution at nucleotide position 5494. The leucine at codon 1832 is replaced by phenylalanine, an amino acid with highly similar properties. This amino acid position is conserved. 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. -

Hereditary cancer Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Mendelics

Sep 11, 2024

This variant is considered likely benign or benign based on one or more of the following: it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease, and/or has normal protein function, and/or has lack of segregation with disease, and/or has been detected in co-occurrence with known pathogenic variant, and/or has lack of disease association in case-control studies, and/or is located in a region inconsistent with a known cause of pathogenicity. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.18
BayesDel_addAF	Uncertain	0.083	D
BayesDel_noAF	Benign	-0.12
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Benign	0.32	T;.
Eigen	Pathogenic	0.69
Eigen_PC	Uncertain	0.64
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.95	D;D
M_CAP	Benign	0.015	T
MetaRNN	Pathogenic	0.94	D;D
MetaSVM	Benign	-0.52	T
MutationAssessor	Uncertain	2.2	M;.
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Uncertain	0.54	T
PROVEAN	Uncertain	-3.2	D;D
REVEL	Uncertain	0.29
Sift	Benign	0.072	T;T
Sift4G	Benign	0.089	T;T
Polyphen		0.87	P;.
Vest4		0.88
MutPred		0.77		Gain of catalytic residue at D1834 (P = 8e-04);.;
MVP		0.61
MPC		0.68
ClinPred		0.96	D
GERP RS		5.6
Varity_R		0.22
gMVP		0.64

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.16		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: rs1456049352; hg19: chr12-133215769;