rs267608687

Variant names:

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM5PP2PP5

The NM_018082.6(POLR3B):c.2303G>A(p.Arg768His) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000632 in 1,612,764 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R768C) has been classified as Likely pathogenic.

Frequency

Genomes: 𝑓 0.000072 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000062 ( 0 hom. )

Consequence

POLR3B
NM_018082.6 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:7U:3O:1

Conservation

PhyloP100: 9.96

Publications

9 publications found

Variant links:

Genes affected

POLR3B (HGNC:30348): (RNA polymerase III subunit B) This gene encodes the second largest subunit of RNA polymerase III, the polymerase responsible for synthesizing transfer and small ribosomal RNAs in eukaryotes. The largest subunit and the encoded protein form the catalytic center of RNA polymerase III. Mutations in this gene are a cause of hypomyelinating leukodystrophy. Alternatively spliced transcript variants encoding multiple isoforms have been observed for this gene. [provided by RefSeq, Dec 2011]

POLR3B Gene-Disease associations (from GenCC):

POLR3B-related disorder
Inheritance: AD, AR Classification: DEFINITIVE Submitted by: ClinGen
hypomyelinating leukodystrophy 8 with or without oligodontia and-or hypogonadotropic hypogonadism
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), Illumina, G2P
neurodevelopmental disorder
Inheritance: AR, AD Classification: DEFINITIVE, STRONG Submitted by: G2P
Charcot-Marie-Tooth disease, demyelinating, IIA 1I
Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
endosteal sclerosis-cerebellar hypoplasia syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
hypomyelination-hypogonadotropic hypogonadism-hypodontia syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

POLR3B links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

PM5

Other missense variant is known to change same aminoacid residue: Variant chr12-106457146-C-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 973230.

PP2

Missense variant in the POLR3B gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 24 curated pathogenic missense variants (we use a threshold of 10). The gene has 6 curated benign missense variants. Gene score misZ: 3.1978 (above the threshold of 3.09). Trascript score misZ: 3.4842 (above the threshold of 3.09). GenCC associations: The gene is linked to POLR3B-related disorder, hypomyelinating leukodystrophy 8 with or without oligodontia and-or hypogonadotropic hypogonadism, hypomyelination-hypogonadotropic hypogonadism-hypodontia syndrome, neurodevelopmental disorder, endosteal sclerosis-cerebellar hypoplasia syndrome, Charcot-Marie-Tooth disease, demyelinating, IIA 1I.

PP5

Variant 12-106457147-G-A is Pathogenic according to our data. Variant chr12-106457147-G-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 31161.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_018082.6. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	POLR3B	NM_018082.6	MANE Select	c.2303G>A	p.Arg768His	missense	Exon 21 of 28	NP_060552.4
	POLR3B	NM_001160708.2		c.2129G>A	p.Arg710His	missense	Exon 21 of 28	NP_001154180.1	Q9NW08-2

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
POLR3B	ENST00000228347.9	TSL:1 MANE Select	c.2303G>A	p.Arg768His	missense	Exon 21 of 28	ENSP00000228347.4	Q9NW08-1
POLR3B	ENST00000970165.1		c.2303G>A	p.Arg768His	missense	Exon 21 of 29	ENSP00000640224.1
POLR3B	ENST00000887559.1		c.2315G>A	p.Arg772His	missense	Exon 21 of 28	ENSP00000557618.1

Frequencies

GnomAD3 genomes

AF:

0.0000724

AC:

AN:

152034

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000725

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00124

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000294

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000836

AC:

AN:

251166

AF XY:

0.000111

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000579

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000881

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000623

AC:

AN:

1460612

Hom.:

Cov.:

AF XY:

0.0000674

AC XY:

AN XY:

726684

show subpopulations

African (AFR)

AF:

0.0000299

AC:

AN:

33434

American (AMR)

AF:

0.0000671

AC:

AN:

44688

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26110

East Asian (EAS)

AF:

0.0000756

AC:

AN:

39678

South Asian (SAS)

AF:

0.000626

AC:

AN:

86230

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53404

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5762

European-Non Finnish (NFE)

AF:

0.0000225

AC:

AN:

1110964

Other (OTH)

AF:

0.0000829

AC:

AN:

60342

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.456

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0000723

AC:

AN:

152152

Hom.:

Cov.:

AF XY:

0.000108

AC XY:

AN XY:

74366

show subpopulations

African (AFR)

AF:

0.0000723

AC:

AN:

41488

American (AMR)

AF:

0.00

AC:

AN:

15274

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5180

South Asian (SAS)

AF:

0.00125

AC:

AN:

4816

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10582

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000294

AC:

AN:

68024

Other (OTH)

AF:

0.00

AC:

AN:

2112

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.416

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.0000806

Hom.:

Bravo

AF:

0.0000642

ExAC

AF:

0.0000824

AC:

ClinVar

ClinVar submissions

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

not provided (4)

Hypomyelinating leukodystrophy 8 with or without oligodontia and-or hypogonadotropic hypogonadism (4)

Charcot-Marie-Tooth disease, demyelinating, IIA 1I (1)

POLR-related leukodystrophy (1)

POLR3B-related disorder (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.78

BayesDel_addAF

Uncertain

0.15

BayesDel_noAF

Pathogenic

0.34

CADD

Pathogenic

(source)

DANN

Pathogenic

1.0

DEOGEN2

Benign

0.42

Eigen

Pathogenic

0.96

Eigen_PC

Pathogenic

0.96

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Pathogenic

0.99

M_CAP

Uncertain

0.12

MetaRNN

Uncertain

0.71

MetaSVM

Uncertain

0.068

MutationAssessor

Pathogenic

3.1

PhyloP100

PrimateAI

Pathogenic

0.87

PROVEAN

Pathogenic

-4.8

REVEL

Pathogenic

0.71

Sift

Pathogenic

0.0

Sift4G

Pathogenic

0.0010

Polyphen

1.0

Vest4

0.93

MVP

0.78

MPC

1.8

ClinPred

0.95

GERP RS

6.0

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.82

gMVP

0.95

Mutation Taster

=19/81

disease causing (ClinVar)

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over