ENST00000674977.2:c.83C>G

Variant names:

• chr17-7484847-C-G
• rs1388837601
• ENST00000674977.2:c.83C>G

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM2 PP2 PP3_Moderate

The ENST00000674977.2(POLR2A):​c.83C>G​(p.Pro28Arg) variant causes a missense change. 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 (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P28L) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: POLR2A ENST00000674977.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter P:1 U:1
• Conservation: PhyloP100: 5.50

Genes affected

POLR2A (HGNC:9187): (RNA polymerase II subunit A) This gene encodes the largest subunit of RNA polymerase II, the polymerase responsible for synthesizing messenger RNA in eukaryotes. The product of this gene contains a carboxy terminal domain composed of heptapeptide repeats that are essential for polymerase activity. These repeats contain serine and threonine residues that are phosphorylated in actively transcribing RNA polymerase. In addition, this subunit, in combination with several other polymerase subunits, forms the DNA binding domain of the polymerase, a groove in which the DNA template is transcribed into RNA. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the POLR2A gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 21 curated pathogenic missense variants (we use a threshold of 10). The gene has 8 curated benign missense variants. Trascript score misZ: 9.1879 (above the threshold of 3.09). GenCC associations: The gene is linked to neurodevelopmental disorder with hypotonia and variable intellectual and behavioral abnormalities, autism, susceptibility to, 15.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.889

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
POLR2A	NM_000937.5	c.83C>G	p.Pro28Arg	missense_variant	Exon 1 of 30		NP_000928.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
POLR2A	ENST00000674977.2	c.83C>G	p.Pro28Arg	missense_variant	Exon 1 of 30			ENSP00000502190.2
POLR2A	ENST00000572844.1	n.228C>G		non_coding_transcript_exon_variant	Exon 1 of 10	1
POLR2A	ENST00000617998.6	n.482C>G		non_coding_transcript_exon_variant	Exon 1 of 29	1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 33

Bravo AF: 0.00000756

ClinVar

Significance: Uncertain significance

Submissions summary: Pathogenic:1 Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Neurodevelopmental disorder with hypotonia and variable intellectual and behavioral abnormalities Pathogenic:1 Uncertain:1

Apr 07, 2020

Baylor Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was determined to be of uncertain significance according to ACMG Guidelines, 2015 [PMID:25741868]. -

May 08, 2020

Human Genome Sequencing Center Clinical Lab, Baylor College of Medicine

Significance: Likely pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.96
BayesDel_addAF	Pathogenic	0.35	D
BayesDel_noAF	Pathogenic	0.27
CADD	Pathogenic	30
DANN	Uncertain	1.0
Eigen	Pathogenic	0.96
Eigen_PC	Pathogenic	0.89
FATHMM_MKL	Benign	0.34	N
LIST_S2	Pathogenic	0.99	D
M_CAP	Pathogenic	0.35	D
MetaRNN	Pathogenic	0.89	D
MetaSVM	Uncertain	0.47	D
MutationAssessor	Pathogenic	3.7	H
PrimateAI	Pathogenic	0.89	D
Sift4G	Pathogenic	0.0	D
Vest4		0.83
MutPred		0.65		Gain of MoRF binding (P = 0.0038);
MVP		0.88
ClinPred		1.0	D
GERP RS		5.8
gMVP		0.82

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: rs1388837601; hg19: chr17-7388166;