16-81363906-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2BP4

The NM_022041.4(GAN):c.1199C>T(p.Thr400Ile) variant causes a missense change. The variant allele was found at a frequency of 0.000000684 in 1,461,268 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 (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. T400S) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

GAN
NM_022041.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 4.52

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 1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.41244647).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GAN	NM_022041.4 linkuse as main transcript	c.1199C>T	p.Thr400Ile	missense_variant	7/11	ENST00000648994.2
GAN	NM_001377486.1 linkuse as main transcript	c.560C>T	p.Thr187Ile	missense_variant	6/10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Appris
GAN	ENST00000648994.2 linkuse as main transcript	c.1199C>T	p.Thr400Ile	missense_variant	7/11	NM_022041.4	P1
GAN	ENST00000648349.2 linkuse as main transcript	c.*907C>T		3_prime_UTR_variant, NMD_transcript_variant	6/10
GAN	ENST00000650388.1 linkuse as main transcript	c.*556C>T		3_prime_UTR_variant, NMD_transcript_variant	5/9

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.00000398

AC:

AN:

251472

Hom.:

AF XY:

0.00000736

AC XY:

AN XY:

135908

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

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:

0.00000879

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461268

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

726978

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

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:

9.00e-7

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

ExAC

AF:

0.00000824

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.0000593

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

Mar 01, 2021

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, but these predictions have not been confirmed by published functional studies and their clinical significance is uncertain. This variant has not been reported in the literature in individuals with GAN-related conditions. This variant is present in population databases (rs368571975, ExAC 0.001%). This sequence change replaces threonine with isoleucine at codon 400 of the GAN protein (p.Thr400Ile). The threonine residue is moderately conserved and there is a moderate physicochemical difference between threonine and isoleucine. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.11

BayesDel_addAF

Uncertain

0.091

BayesDel_noAF

Benign

-0.11

Cadd

Benign

Dann

Uncertain

1.0

DEOGEN2

Uncertain

0.53

D;D

Eigen

Benign

0.093

Eigen_PC

Benign

0.18

FATHMM_MKL

Uncertain

0.96

M_CAP

Benign

0.020

MetaRNN

Benign

0.41

T;T

MetaSVM

Benign

-0.40

MutationAssessor

Benign

1.6

L;L

MutationTaster

Benign

1.0

PrimateAI

Uncertain

0.74

Sift4G

Uncertain

0.010

D;.

Polyphen

0.33

B;B

Vest4

0.72

MutPred

0.51

Loss of ubiquitination at K399 (P = 0.0768);Loss of ubiquitination at K399 (P = 0.0768);

MVP

0.89

MPC

0.22

ClinPred

0.65

GERP RS

4.1

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.25

gMVP

0.53

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