4-2085672-T-G

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The NM_181808.4(POLN):c.2138A>C(p.Gln713Pro) variant causes a missense change involving the alteration of a non-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 Uncertain significance (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: POLN NM_181808.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.41

Genes affected

POLN (HGNC:18870): (DNA polymerase nu) This gene encodes a DNA polymerase type-A family member. The encoded protein plays a role in DNA repair and homologous recombination. This gene shares its 5' exons with some transcripts from overlapping GeneID: 79441, which encodes an augmentin-like protein complex subunit. [provided by RefSeq, Dec 2014]

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, 0.786

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
POLN	NM_181808.4	c.2138A>C	p.Gln713Pro	missense_variant	21/26	ENST00000511885.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
POLN	ENST00000511885.6	c.2138A>C	p.Gln713Pro	missense_variant	21/26	5	NM_181808.4	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jul 06, 2022

The c.2138A>C (p.Q713P) alteration is located in exon 19 (coding exon 19) of the POLN gene. This alteration results from a A to C substitution at nucleotide position 2138, causing the glutamine (Q) at amino acid position 713 to be replaced by a proline (P). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.36
BayesDel_addAF	Pathogenic	0.21	D
BayesDel_noAF	Uncertain	0.060
Cadd	Uncertain	25
Dann	Uncertain	0.99
DEOGEN2	Uncertain	0.47	T;T
Eigen	Uncertain	0.60
Eigen_PC	Uncertain	0.52
FATHMM_MKL	Benign	0.75	D
LIST_S2	Benign	0.76	T;.
M_CAP	Uncertain	0.17	D
MetaRNN	Pathogenic	0.79	D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	3.1	M;M
MutationTaster	Benign	0.90	D;D
PrimateAI	Uncertain	0.49	T
PROVEAN	Uncertain	-3.6	D;D
REVEL	Pathogenic	0.71
Sift	Uncertain	0.0080	D;D
Sift4G	Uncertain	0.012	D;D
Polyphen		0.97	D;D
Vest4		0.62
MutPred		0.43		Loss of MoRF binding (P = 0.0386);Loss of MoRF binding (P = 0.0386);
MVP		0.97
MPC		0.44
ClinPred		0.99	D
GERP RS		4.4
Varity_R		0.98
gMVP		0.76

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

Other links and lift over

dbSNP: rs1730531719; hg19: chr4-2087399;