Genetic Variant PANX1:p.Ile64Val (chr11-94153499-A-G) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_015368.4(PANX1):c.190A>G(p.Ile64Val) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,844 control chromosomes in the GnomAD database, with no homozygous occurrence. 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. I64T) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

PANX1
NM_015368.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 7.83

Variant links:

Genes affected

PANX1 (HGNC:8599): (pannexin 1) The protein encoded by this gene belongs to the innexin family. Innexin family members are the structural components of gap junctions. This protein and pannexin 2 are abundantly expressed in central nerve system (CNS) and are coexpressed in various neuronal populations. Studies in Xenopus oocytes suggest that this protein alone and in combination with pannexin 2 may form cell type-specific gap junctions with distinct properties. [provided by RefSeq, Jul 2008]

PANX1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PANX1	NM_015368.4 link	c.190A>G	p.Ile64Val	missense_variant	Exon 2 of 5	ENST00000227638.8	NP_056183.2	Q96RD7-1A0A024R397
PANX1	XM_011542734.3 link	c.-483A>G		upstream_gene_variant			XP_011541036.1
PANX1	XM_047426702.1 link	c.-379A>G		upstream_gene_variant			XP_047282658.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PANX1	ENST00000227638.8 link	c.190A>G	p.Ile64Val	missense_variant	Exon 2 of 5	1	NM_015368.4	ENSP00000227638.3		Q96RD7-1
PANX1	ENST00000436171.2 link	c.190A>G	p.Ile64Val	missense_variant	Exon 2 of 5	1		ENSP00000411461.2		Q96RD7-2

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461844

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

727218

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

33476

American (AMR)

AF:

0.00

AC:

AN:

44722

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26134

East Asian (EAS)

AF:

0.00

AC:

AN:

39698

South Asian (SAS)

AF:

0.0000116

AC:

AN:

86246

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53420

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5760

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1111996

Other (OTH)

AF:

0.00

AC:

AN:

60392

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.375

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Feb 05, 2024

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.190A>G (p.I64V) alteration is located in exon 2 (coding exon 2) of the PANX1 gene. This alteration results from a A to G substitution at nucleotide position 190, causing the isoleucine (I) at amino acid position 64 to be replaced by a valine (V). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.39

BayesDel_addAF

Benign

0.0097

BayesDel_noAF

Benign

-0.22

CADD

Uncertain

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.20

T;.

Eigen

Uncertain

0.34

Eigen_PC

Uncertain

0.38

FATHMM_MKL

Uncertain

0.90

LIST_S2

Uncertain

0.92

D;D

M_CAP

Benign

0.0075

MetaRNN

Uncertain

0.47

T;T

MetaSVM

Benign

-0.81

MutationAssessor

Uncertain

2.8

M;M

PhyloP100

7.8

PrimateAI

Uncertain

0.65

PROVEAN

Benign

-0.78

N;N

REVEL

Benign

0.21

Sift

Benign

0.060

T;T

Sift4G

Benign

0.14

T;T

Polyphen

0.58

P;P

Vest4

0.60

MutPred

0.72

Gain of glycosylation at T62 (P = 0.1337);Gain of glycosylation at T62 (P = 0.1337);

MVP

0.54

MPC

0.19

ClinPred

0.95

GERP RS

4.5

Varity_R

0.35

gMVP

0.60

Mutation Taster

=78/22

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.25

Details are displayed if max score is > 0.2

DS_AL_spliceai

0.25

Position offset: -8

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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11-94153499-A-G

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over