chr16-81315130-CCGTGTCTGACCCTCAGCACGCCGCGCGTCTGCTGCGAG-C

Position:

• chr16-81315130-CCGTGTCTGACCCTCAGCACGCCGCGCGTCTGCTGCGAG-C

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PVS1

The NM_022041.4(GAN):​c.20_57del​(p.Val7AlafsTer43) variant causes a frameshift change. Variant has been reported in ClinVar as Uncertain significance (no stars). 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)
  • Failed GnomAD Quality Control
• Consequence: GAN NM_022041.4 frameshift
• Clinical Significance: Uncertain significance no assertion criteria provided U:2
• Conservation: PhyloP100: 5.64

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 Likely_pathogenic. Variant got 8 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant located near the start codon (<100nt), not predicted to undergo nonsense mediated mRNA decay. There are 79 pathogenic variants in the truncated region.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GAN	NM_022041.4	c.20_57del	p.Val7AlafsTer43	frameshift_variant	1/11	ENST00000648994.2
GAN	NM_001377486.1	c.-505_-468del		5_prime_UTR_variant	1/10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GAN	ENST00000648994.2	c.20_57del	p.Val7AlafsTer43	frameshift_variant	1/11		NM_022041.4	P1
GAN	ENST00000674788.1	n.145_182del		non_coding_transcript_exon_variant	1/3
GAN	ENST00000648349.2	c.20_57del	p.Val7AlafsTer541	frameshift_variant, NMD_transcript_variant	1/10
GAN	ENST00000650388.1	c.20_57del	p.Val7AlafsTer?	frameshift_variant, NMD_transcript_variant	1/9

Frequencies

GnomAD3 genomes AF: 0.00 AC: 1 AN: 151972 Hom.: 0 Cov.: 33 FAILED QC

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

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Data not reliable, filtered out with message: AS_VQSR AF: 0.00000658 AC: 1 AN: 151972 Hom.: 0 Cov.: 33 AF XY: 0.0000135 AC XY: 1 AN XY: 74244

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

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: no assertion criteria provided

Submissions by phenotype

Giant axonal neuropathy 1 Uncertain:2

Uncertain significance, no assertion criteria provided	literature only	Inherited Neuropathy Consortium	-	- -
Uncertain significance, no assertion criteria provided	literature only	Inherited Neuropathy Consortium Ii, University Of Miami	Jan 06, 2016	- -

Computational scores

Source: dbNSFP v4.3

Splicing

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

Publications

LitVar

Other links and lift over

dbSNP: rs1316993088; hg19: chr16-81348735;