16-81356834-C-G

Position:

• chr16-81356834-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 4P and 2B. PM1 PM2 BP4_Moderate

The NM_022041.4(GAN):​c.683C>G​(p.Ser228Cys) variant causes a missense change. The variant allele was found at a frequency of 0.00000657 in 152,110 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/18 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.0000066 (0 hom., cov: 32)
• Consequence: GAN NM_022041.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 3.69

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM1: In a domain BACK (size 102) in uniprot entity GAN_HUMAN there are 4 pathogenic changes around while only 0 benign (100%) in NM_022041.4
• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.24050221).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
GAN	NM_022041.4	c.683C>G	p.Ser228Cys	missense_variant	4/11	ENST00000648994.2	NP_071324.1
GAN	NM_001377486.1	c.44C>G	p.Ser15Cys	missense_variant	3/10		NP_001364415.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
GAN	ENST00000648994.2	c.683C>G	p.Ser228Cys	missense_variant	4/11		NM_022041.4	ENSP00000497351.1

Frequencies

GnomAD3 genomes AF: 0.00000657 AC: 1 AN: 152110 Hom.: 0 Cov.: 32

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 Cov.: 31

GnomAD4 genome AF: 0.00000657 AC: 1 AN: 152110 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 74298

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

Bravo AF: 0.00000378

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.089
BayesDel_addAF	Benign	-0.15	T
BayesDel_noAF	Benign	-0.45
CADD	Benign	23
DANN	Uncertain	0.98
DEOGEN2	Uncertain	0.49	T;T
Eigen	Benign	0.050
Eigen_PC	Uncertain	0.23
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Benign	0.79	.;T
M_CAP	Benign	0.0045	T
MetaRNN	Benign	0.24	T;T
MetaSVM	Benign	-0.68	T
MutationAssessor	Benign	1.8	L;L
PrimateAI	Benign	0.47	T
Sift4G	Benign	0.16	T;.
Polyphen		0.0	B;B
Vest4		0.46
MutPred		0.33		Loss of disorder (P = 0.0309);Loss of disorder (P = 0.0309);
MVP		0.80
MPC		0.11
ClinPred		0.53	D
GERP RS		5.5
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.48
gMVP		0.23

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

Other links and lift over

dbSNP: rs1301648787; hg19: chr16-81390439;