2-55636244-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 4P and 2B. PM1PM2BP4_Moderate

The NM_033109.5(PNPT1):c.2345C>G(p.Ser782Cys) variant causes a missense change. The variant allele was found at a frequency of 0.0000112 in 1,604,950 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.000066 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0000055 ( 0 hom. )

Consequence

PNPT1
NM_033109.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2

Conservation

PhyloP100: 3.77

Variant links:

Genes affected

PNPT1 (HGNC:23166): (polyribonucleotide nucleotidyltransferase 1) The protein encoded by this gene belongs to the evolutionary conserved polynucleotide phosphorylase family comprised of phosphate dependent 3'-to-5' exoribonucleases implicated in RNA processing and degradation. This enzyme is predominantly localized in the mitochondrial intermembrane space and is involved in import of RNA to mitochondria. Mutations in this gene have been associated with combined oxidative phosphorylation deficiency-13 and autosomal recessive nonsyndromic deafness-70. Related pseudogenes are found on chromosomes 3 and 7. [provided by RefSeq, Dec 2012]

PNPT1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM1

In a modified_residue Phosphoserine (size 0) in uniprot entity PNPT1_HUMAN

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.09001386).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE
PNPT1	NM_033109.5 linkuse as main transcript	c.2345C>G	p.Ser782Cys	missense_variant	28/28	ENST00000447944.7
PNPT1	XM_005264629.3 linkuse as main transcript	c.2105C>G	p.Ser702Cys	missense_variant	28/28
PNPT1	XM_017005172.2 linkuse as main transcript	c.2105C>G	p.Ser702Cys	missense_variant	27/27

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris
PNPT1	ENST00000447944.7 linkuse as main transcript	c.2345C>G	p.Ser782Cys	missense_variant	28/28	1	NM_033109.5	P1
PNPT1	ENST00000415374.5 linkuse as main transcript	c.2345C>G	p.Ser782Cys	missense_variant, NMD_transcript_variant	28/29	5
PNPT1	ENST00000260604.8 linkuse as main transcript	c.*1887C>G		3_prime_UTR_variant, NMD_transcript_variant	27/27	5

Frequencies

GnomAD3 genomes

AF:

0.0000660

AC:

AN:

151624

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000591

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:

0.000478

GnomAD3 exomes

AF:

0.0000122

AC:

AN:

246362

Hom.:

AF XY:

0.00000753

AC XY:

AN XY:

132832

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000883

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:

0.00000550

AC:

AN:

1453326

Hom.:

Cov.:

AF XY:

0.00000692

AC XY:

AN XY:

722292

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.000114

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:

0.0000499

GnomAD4 genome

AF:

0.0000660

AC:

AN:

151624

Hom.:

Cov.:

AF XY:

0.0000811

AC XY:

AN XY:

73970

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.000591

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:

0.000478

Alfa

AF:

0.0000712

Hom.:

Bravo

AF:

0.000166

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Inborn genetic diseases

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Nov 06, 2023

The c.2345C>G (p.S782C) alteration is located in exon 28 (coding exon 28) of the PNPT1 gene. This alteration results from a C to G substitution at nucleotide position 2345, causing the serine (S) at amino acid position 782 to be replaced by a cysteine (C). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Oct 25, 2022

This sequence change replaces serine, which is neutral and polar, with cysteine, which is neutral and slightly polar, at codon 782 of the PNPT1 protein (p.Ser782Cys). This variant is present in population databases (no rsID available, gnomAD 0.009%). This variant has not been reported in the literature in individuals affected with PNPT1-related conditions. ClinVar contains an entry for this variant (Variation ID: 1350931). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt PNPT1 protein function. 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.077

BayesDel_addAF

Benign

-0.17

BayesDel_noAF

Benign

-0.29

Cadd

Benign

Dann

Uncertain

0.98

DEOGEN2

Benign

0.026

Eigen

Benign

-0.13

Eigen_PC

Benign

0.040

FATHMM_MKL

Pathogenic

0.98

M_CAP

Benign

0.0085

MetaRNN

Benign

0.090

MetaSVM

Benign

-0.92

MutationAssessor

Benign

2.0

MutationTaster

Benign

0.99

PrimateAI

Benign

0.48

PROVEAN

Benign

-0.85

REVEL

Benign

0.11

Sift

Uncertain

0.013

Sift4G

Uncertain

0.0050

Polyphen

0.0

Vest4

0.24

MutPred

0.22

Loss of phosphorylation at S782 (P = 0.0074);

MVP

0.46

MPC

0.22

ClinPred

0.28

GERP RS

5.1

Varity_R

0.097

gMVP

0.27

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

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