16-81315130-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_022041.4(GAN):c.17C>T(p.Ala6Val) variant causes a missense change. The variant allele was found at a frequency of 0.0000112 in 1,521,452 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. A6A) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000012 ( 0 hom. )

Consequence

GAN
NM_022041.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 4.30

Variant links:

Genes affected

GAN (HGNC:4137): (gigaxonin) This gene encodes a member of the cytoskeletal BTB/kelch (Broad-Complex, Tramtrack and Bric a brac) repeat family. The encoded protein plays a role in neurofilament architecture and is involved in mediating the ubiquitination and degradation of some proteins. Defects in this gene are a cause of giant axonal neuropathy (GAN). [provided by RefSeq, Oct 2008]

GAN links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.12567788).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GAN	NM_022041.4 linkuse as main transcript	c.17C>T	p.Ala6Val	missense_variant	1/11	ENST00000648994.2
GAN	NM_001377486.1 linkuse as main transcript	c.-508C>T		5_prime_UTR_variant	1/10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Appris
GAN	ENST00000648994.2 linkuse as main transcript	c.17C>T	p.Ala6Val	missense_variant	1/11	NM_022041.4	P1
GAN	ENST00000674788.1 linkuse as main transcript	n.142C>T		non_coding_transcript_exon_variant	1/3
GAN	ENST00000648349.2 linkuse as main transcript	c.17C>T	p.Ala6Val	missense_variant, NMD_transcript_variant	1/10
GAN	ENST00000650388.1 linkuse as main transcript	c.17C>T	p.Ala6Val	missense_variant, NMD_transcript_variant	1/9

Frequencies

GnomAD3 genomes

AF:

0.00000658

AC:

AN:

151972

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

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:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.0000117

AC:

AN:

1369480

Hom.:

Cov.:

AF XY:

0.0000148

AC XY:

AN XY:

676770

show subpopulations

Gnomad4 AFR exome

AF:

0.0000356

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000320

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000131

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000658

AC:

AN:

151972

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74244

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000869

Hom.:

Bravo

AF:

0.0000151

ExAC

AF:

0.0000171

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Giant axonal neuropathy 1

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Feb 03, 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 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: 465394). This variant has not been reported in the literature in individuals affected with GAN-related conditions. The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This sequence change replaces alanine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 6 of the GAN protein (p.Ala6Val). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.095

BayesDel_addAF

Uncertain

0.023

BayesDel_noAF

Benign

-0.21

Cadd

Benign

Dann

Uncertain

0.99

DEOGEN2

Benign

0.15

T;T

Eigen

Benign

-0.29

Eigen_PC

Benign

-0.097

FATHMM_MKL

Uncertain

0.93

M_CAP

Pathogenic

0.95

MetaRNN

Benign

0.13

T;T

MetaSVM

Benign

-0.78

MutationAssessor

Benign

-0.58

N;N

MutationTaster

Benign

0.88

PrimateAI

Pathogenic

0.95

Sift4G

Benign

0.95

T;.

Polyphen

0.0

B;B

Vest4

0.36

MutPred

0.19

Loss of glycosylation at S5 (P = 0.1085);Loss of glycosylation at S5 (P = 0.1085);

MVP

0.83

MPC

0.12

ClinPred

0.26

GERP RS

4.2

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.9

Varity_R

0.28

gMVP

0.22

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