chr7-4860148-T-C

Variant names:

• chr7-4860148-T-C
• rs1562453759
• NM_020144.5:c.1663A>G

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_020144.5(PAPOLB):​c.1663A>G​(p.Arg555Gly) 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 benign outcome for this variant. 12/15 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)
• Consequence: PAPOLB NM_020144.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.67

Genes affected

PAPOLB (HGNC:15970): (poly(A) polymerase beta) Predicted to enable polynucleotide adenylyltransferase activity. Predicted to be involved in mRNA polyadenylation. Predicted to be located in endoplasmic reticulum. Predicted to be active in nucleus. [provided by Alliance of Genome Resources, Apr 2022]

RADIL (HGNC:22226): (Rap associating with DIL domain) Predicted to enable GTPase binding activity. Acts upstream of or within substrate adhesion-dependent cell spreading. Located in microtubule. Part of protein-containing complex. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.06437877).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PAPOLB	NM_020144.5	c.1663A>G	p.Arg555Gly	missense_variant	Exon 1 of 1	ENST00000404991.2	NP_064529.4
RADIL	NM_018059.5	c.535+17457A>G		intron_variant	Intron 2 of 14	ENST00000399583.4	NP_060529.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PAPOLB	ENST00000404991.2	c.1663A>G	p.Arg555Gly	missense_variant	Exon 1 of 1	6	NM_020144.5	ENSP00000384700.2
RADIL	ENST00000399583.4	c.535+17457A>G		intron_variant	Intron 2 of 14	5	NM_018059.5	ENSP00000382492.3
RADIL	ENST00000445392.5	n.535+17457A>G		intron_variant	Intron 2 of 14	5		ENSP00000413403.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Jan 03, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.1663A>G (p.R555G) alteration is located in exon 1 (coding exon 1) of the PAPOLB gene. This alteration results from a A to G substitution at nucleotide position 1663, causing the arginine (R) at amino acid position 555 to be replaced by a glycine (G). 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
BayesDel_addAF	Benign	-0.11	T
BayesDel_noAF	Benign	-0.40
CADD	Benign	14
DANN	Benign	0.95
Eigen	Benign	-0.52
Eigen_PC	Benign	-0.42
FATHMM_MKL	Benign	0.65	D
LIST_S2	Uncertain	0.87	D
M_CAP	Benign	0.0047	T
MetaRNN	Benign	0.064	T
MetaSVM	Benign	-0.99	T
PrimateAI	Benign	0.28	T
REVEL	Benign	0.016
Sift4G	Benign	0.14	T
Polyphen		0.032	B
Vest4		0.13
MVP		0.45
MPC		0.13
ClinPred		0.14	T
GERP RS		3.3
gMVP		0.17

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: rs1562453759; hg19: chr7-4899779;