rs138305578

Variant names:

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2PP2

The NM_007055.4(POLR3A):c.3392A>G(p.Lys1131Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000105 in 1,612,722 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.000059 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0000055 ( 0 hom. )

Consequence

POLR3A
NM_007055.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1U:3

Conservation

PhyloP100: 7.64

Variant links:

Genes affected

POLR3A (HGNC:30074): (RNA polymerase III subunit A) The protein encoded by this gene is the catalytic component of RNA polymerase III, which synthesizes small RNAs. The encoded protein also acts as a sensor to detect foreign DNA and trigger an innate immune response. [provided by RefSeq, Aug 2011]

POLR3A links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP2

Missense variant in the POLR3A gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 16 curated pathogenic missense variants (we use a threshold of 10). The gene has 8 curated benign missense variants. Gene score misZ: 2.3065 (below the threshold of 3.09). Trascript score misZ: 3.6654 (above the threshold of 3.09). GenCC associations: The gene is linked to leukoencephalopathy-ataxia-hypodontia-hypomyelination syndrome, Wiedemann-Rautenstrauch syndrome, hypomyelination-hypogonadotropic hypogonadism-hypodontia syndrome, tremor-ataxia-central hypomyelination syndrome, hypomyelination-cerebellar atrophy-hypoplasia of the corpus callosum syndrome, odontoleukodystrophy.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
POLR3A	NM_007055.4 link	c.3392A>G	p.Lys1131Arg	missense_variant	Exon 26 of 31	ENST00000372371.8	NP_008986.2	O14802

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
POLR3A	ENST00000372371.8 link	c.3392A>G	p.Lys1131Arg	missense_variant	Exon 26 of 31	1	NM_007055.4	ENSP00000361446.3		O14802

Frequencies

GnomAD3 genomes

AF:

0.0000591

AC:

AN:

152206

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000217

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000279

AC:

AN:

251058

Hom.:

AF XY:

0.00

AC XY:

AN XY:

135698

show subpopulations

Gnomad AFR exome

AF:

0.000431

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000548

AC:

AN:

1460516

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

726648

show subpopulations

Gnomad4 AFR exome

AF:

0.000239

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

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

AF:

0.0000591

AC:

AN:

152206

Hom.:

Cov.:

AF XY:

0.0000403

AC XY:

AN XY:

74358

show subpopulations

Gnomad4 AFR

AF:

0.000217

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000533

Hom.:

Bravo

AF:

0.0000907

ESP6500AA

AF:

0.000681

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.0000330

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1Uncertain:3

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Aug 16, 2021

Revvity Omics, Revvity

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Aug 31, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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. Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated. ClinVar contains an entry for this variant (Variation ID: 549572). This missense change has been observed in individual(s) with Wiedemann-Rautenstrauch syndrome (PMID: 30323018). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. This variant is present in population databases (rs138305578, gnomAD 0.03%). This sequence change replaces lysine, which is basic and polar, with arginine, which is basic and polar, at codon 1131 of the POLR3A protein (p.Lys1131Arg). -

Neonatal pseudo-hydrocephalic progeroid syndrome

Pathogenic:1

May 01, 2018

Tartaglia Lab, Genetics and Rare Diseases Research Division, Bambino Gesu' Children's Hospital

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: research

- -

Leukodystrophy

Uncertain:1

Jan 24, 2024

Broad Center for Mendelian Genomics, Broad Institute of MIT and Harvard

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: curation

The p.Lys1131Arg variant in POLR3A has been reported in 2 individuals with POLR3A-related disorders (PMID: 30323018, Yananoto et al. 2017), and has been identified in 0.05% (13/24956) of African chromosomes by the Genome Aggregation Database (gnomAD, http://gnomad.broadinstitute.org; dbSNP ID: rs138305578). Although this variant has been seen in the general population in a heterozygous state, its frequency is not high enough to rule out a pathogenic role. This Lys1131Arg variant has also been reported in ClinVar (Variation ID#: 549572) and has been interpreted as likely pathogenic by the Tartaglia Lab (Genetics and Rare Diseases Research Division, Bambino Gesu' Children's Hospital) and as a variant of uncertain significance by Invitae. Of the 2 affected individuals, 1 was a compound heterozygote that carried a likely pathogenic variant in trans, which increases the likelihood that the p.Lys1131Arg variant is pathogenic (PMID: 30323018). Computational prediction tools and conservation analyses suggest that this variant may impact the protein, though this information is not predictive enough to determine pathogenicity. The p.Lys1131Arg variant is located in a region of POLR3A that is essential to protein folding and stability, suggesting that this variant is in a functional domain and slightly supports pathogenicity (PMID: 30323018). In summary, while there is some suspicion for a pathogenic role, the clinical significance of this variant is uncertain. ACMG/AMP Criteria applied: PP3, PM3, PM1_supporting (Richards 2015). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.19

BayesDel_addAF

Benign

-0.13

BayesDel_noAF

Uncertain

-0.070

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Benign

0.23

Eigen

Uncertain

0.43

Eigen_PC

Uncertain

0.52

FATHMM_MKL

Uncertain

0.96

LIST_S2

Uncertain

0.97

M_CAP

Benign

0.046

MetaRNN

Uncertain

0.50

MetaSVM

Benign

-0.64

MutationAssessor

Benign

0.84

PrimateAI

Uncertain

0.66

PROVEAN

Benign

-1.7

REVEL

Benign

0.24

Sift

Benign

0.17

Sift4G

Benign

0.17

Polyphen

0.72

Vest4

0.78

MVP

0.77

MPC

0.32

ClinPred

0.23

GERP RS

5.6

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.31

gMVP

0.74

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.17

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over