9-121310819-G-T

Position:

• chr9-121310819-G-T

Variant summary

Our verdict is Pathogenic. Variant got 16 ACMG points: 16P and 0B. PM2 PM5 PP3_Strong PP5_Very_Strong

The NM_198252.3(GSN):​c.487G>T​(p.Asp163Tyr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,852 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. D163N) has been classified as Pathogenic.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: GSN NM_198252.3 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:4
• Conservation: PhyloP100: 9.96

Genes affected

GSN (HGNC:4620): (gelsolin) The protein encoded by this gene binds to the "plus" ends of actin monomers and filaments to prevent monomer exchange. The encoded calcium-regulated protein functions in both assembly and disassembly of actin filaments. Defects in this gene are a cause of familial amyloidosis Finnish type (FAF). Multiple transcript variants encoding several different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

GSN (HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 16 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr9-121310819-G-A is described in Lovd as [Pathogenic].
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.986
• PP5: Variant 9-121310819-G-T is Pathogenic according to our data. Variant chr9-121310819-G-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 16181.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr9-121310819-G-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
GSN	NM_198252.3	c.487G>T	p.Asp163Tyr	missense_variant	5/18	ENST00000432226.7	NP_937895.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
GSN	ENST00000432226.7	c.487G>T	p.Asp163Tyr	missense_variant	5/18	5	NM_198252.3	ENSP00000404226.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461852 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 727226

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: 8.99e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:4

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Finnish type amyloidosis Pathogenic:3

Pathogenic, no assertion criteria provided	literature only	OMIM	May 17, 2024	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	3billion	Jan 03, 2022	Same nucleotide change resulting in same amino acid change has been previously reported to be associated with GSN related disorder (ClinVar ID: VCV000016181, PMID:1338910, PS1_P). A different missense change at the same codon has been reported as pathogenic/likely pathogenic with strong evidence (ClinVar ID: VCV000016180, PMID:2176164, PM5_M). In silico tool predictions suggest damaging effect of the variant on gene or gene product (REVEL: 0.619, 3CNET: 0.886, PP3_P). It is not observed in the gnomAD v2.1.1 dataset (PM2_M). Therefore, this variant is classified as likely pathogenic according to the recommendation of ACMG/AMP guideline. -
Pathogenic, criteria provided, single submitter	clinical testing	Institute of Human Genetics Munich, Klinikum Rechts Der Isar, TU München	Nov 10, 2017	- -

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Dec 04, 2023

This sequence change replaces aspartic acid, which is acidic and polar, with tyrosine, which is neutral and polar, at codon 214 of the GSN protein (p.Asp214Tyr). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individuals with autosomal dominant amyloidosis, Finnish type (PMID: 1338910, 26915616). This variant is also known as G654T p.Asp187Tyr. ClinVar contains an entry for this variant (Variation ID: 16181). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt GSN protein function with a positive predictive value of 80%. This variant disrupts the p.Asp214 amino acid residue in GSN. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 1652889, 2176164, 22622774, 25342098). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.90
BayesDel_addAF	Pathogenic	0.39	D
BayesDel_noAF	Pathogenic	0.32
CADD	Pathogenic	32
DANN	Uncertain	1.0
DEOGEN2	Benign	0.14	.;T;.;T;T;T;.;T
Eigen	Pathogenic	0.89
Eigen_PC	Pathogenic	0.77
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Pathogenic	0.99	D;D;D;D;D;D;D;D
M_CAP	Uncertain	0.25	D
MetaRNN	Pathogenic	0.99	D;D;D;D;D;D;D;D
MetaSVM	Uncertain	0.25	D
MutationAssessor	Pathogenic	3.7	.;.;.;.;.;.;.;H
PrimateAI	Uncertain	0.65	T
PROVEAN	Pathogenic	-8.4	D;D;.;.;.;.;D;D
REVEL	Uncertain	0.62
Sift	Pathogenic	0.0	D;D;.;.;.;.;D;D
Sift4G	Pathogenic	0.0010	D;D;.;D;D;D;D;D
Polyphen		1.0	.;.;.;.;.;.;.;D
Vest4		0.99
MutPred		0.96		.;.;.;.;.;.;.;Gain of sheet (P = 0.1945);
MVP		0.87
MPC		1.3
ClinPred		1.0	D
GERP RS		4.2
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.98
gMVP		0.95

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs121909715; hg19: chr9-124073097;