4-2072130-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_181808.4(POLN):c.2687C>T(p.Pro896Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,460,656 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: POLN NM_181808.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.79

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 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.10121709).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
POLN	NM_181808.4	c.2687C>T	p.Pro896Leu	missense_variant	26/26	ENST00000511885.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
POLN	ENST00000511885.6	c.2687C>T	p.Pro896Leu	missense_variant	26/26	5	NM_181808.4	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1460656 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 726628

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000504

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

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

Jun 30, 2023

The c.2687C>T (p.P896L) alteration is located in exon 24 (coding exon 24) of the POLN gene. This alteration results from a C to T substitution at nucleotide position 2687, causing the proline (P) at amino acid position 896 to be replaced by a leucine (L). 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	Benign	0.15
BayesDel_addAF	Benign	-0.18	T
BayesDel_noAF	Benign	-0.50
Cadd	Uncertain	23
Dann	Uncertain	0.99
DEOGEN2	Benign	0.0012	T;T
Eigen	Benign	-0.46
Eigen_PC	Benign	-0.31
FATHMM_MKL	Benign	0.59	D
LIST_S2	Benign	0.54	T;.
M_CAP	Benign	0.0050	T
MetaRNN	Benign	0.10	T;T
MetaSVM	Benign	-0.97	T
MutationAssessor	Benign	0.97	L;L
MutationTaster	Benign	0.66	D;D
PrimateAI	Benign	0.34	T
PROVEAN	Benign	-1.1	N;N
REVEL	Benign	0.094
Sift	Benign	0.093	T;T
Sift4G	Pathogenic	0.0	D;D
Polyphen		0.0050	B;B
Vest4		0.36
MutPred		0.24		Gain of sheet (P = 0.0061);Gain of sheet (P = 0.0061);
MVP		0.28
MPC		0.086
ClinPred		0.45	T
GERP RS		2.9
Varity_R		0.048
gMVP		0.43

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.10		Details are displayed if max score is > 0.2

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

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr4-2073857;