rs138305578
Positions:
Variant summary
Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2PP2
The NM_007055.4(POLR3A):āc.3392A>Gā(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: š 0.000059 ( 0 hom., cov: 33)
Exomes š: 0.0000055 ( 0 hom. )
Consequence
POLR3A
NM_007055.4 missense
NM_007055.4 missense
Scores
8
11
Clinical Significance
Conservation
PhyloP100: 7.64
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]
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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 where missense usually causes diseases, POLR3A
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
POLR3A | NM_007055.4 | c.3392A>G | p.Lys1131Arg | missense_variant | 26/31 | ENST00000372371.8 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
POLR3A | ENST00000372371.8 | c.3392A>G | p.Lys1131Arg | missense_variant | 26/31 | 1 | NM_007055.4 | P1 |
Frequencies
GnomAD3 genomes ? AF: 0.0000591 AC: 9AN: 152206Hom.: 0 Cov.: 33
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GnomAD3 exomes AF: 0.0000279 AC: 7AN: 251058Hom.: 0 AF XY: 0.00 AC XY: 0AN XY: 135698
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GnomAD4 exome AF: 0.00000548 AC: 8AN: 1460516Hom.: 0 Cov.: 29 AF XY: 0.00 AC XY: 0AN XY: 726648
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GnomAD4 genome ? AF: 0.0000591 AC: 9AN: 152206Hom.: 0 Cov.: 33 AF XY: 0.0000403 AC XY: 3AN XY: 74358
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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
Uncertain significance, criteria provided, single submitter | clinical testing | Revvity Omics, Revvity | Aug 16, 2021 | - - |
Uncertain significance, criteria provided, single submitter | clinical testing | Invitae | Aug 31, 2022 | 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
Likely pathogenic, criteria provided, single submitter | research | Tartaglia Lab, Genetics and Rare Diseases Research Division, Bambino Gesu' Children's Hospital | May 01, 2018 | - - |
Leukodystrophy Uncertain:1
Uncertain significance, criteria provided, single submitter | curation | Broad Center for Mendelian Genomics, Broad Institute of MIT and Harvard | Jan 24, 2024 | 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:
Name
Calibrated prediction
Score
Prediction
AlphaMissense
Benign
BayesDel_addAF
Benign
T
BayesDel_noAF
Uncertain
CADD
Uncertain
DANN
Uncertain
DEOGEN2
Benign
T
Eigen
Uncertain
Eigen_PC
Uncertain
FATHMM_MKL
Uncertain
D
LIST_S2
Uncertain
D
M_CAP
Benign
D
MetaRNN
Uncertain
T
MetaSVM
Benign
T
MutationAssessor
Benign
L
MutationTaster
Benign
D
PrimateAI
Uncertain
T
PROVEAN
Benign
N
REVEL
Benign
Sift
Benign
T
Sift4G
Benign
T
Polyphen
P
Vest4
MVP
MPC
ClinPred
T
GERP RS
RBP_binding_hub_radar
RBP_regulation_power_radar
Varity_R
gMVP
Splicing
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SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at