Genetic Variant NM_012418.4:c.64C>T (chr17-81528595-C-T) – ACMG Classification: Likely_benign (-3 pts)

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 1P and 4B. PP3BS2

The NM_012418.4(FSCN2):c.64C>T(p.Arg22Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000249 in 1,608,834 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 Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000033 ( 0 hom., cov: 34)

Exomes 𝑓: 0.000024 ( 0 hom. )

Consequence

FSCN2
NM_012418.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 1.68

Variant links:

Genes affected

FSCN2 (HGNC:3960): (fascin actin-bundling protein 2, retinal) This gene encodes a member of the fascin protein family. Fascins crosslink actin into filamentous bundles within dynamic cell extensions. This family member is proposed to play a role in photoreceptor disk morphogenesis. A mutation in this gene results in one form of autosomal dominant retinitis pigmentosa and macular degeneration. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

FSCN2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -3 ACMG points.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.834

BS2

High AC in GnomAd4 at 5 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
FSCN2	NM_012418.4 link	c.64C>T	p.Arg22Cys	missense_variant	Exon 1 of 5	ENST00000417245.7	NP_036550.1	O14926-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
FSCN2	ENST00000417245.7 link	c.64C>T	p.Arg22Cys	missense_variant	Exon 1 of 5	1	NM_012418.4	ENSP00000388716.2		O14926-1
FSCN2	ENST00000334850.7 link	c.64C>T	p.Arg22Cys	missense_variant	Exon 1 of 5	5		ENSP00000334665.7		O14926-2

Frequencies

GnomAD3 genomes

AF:

0.0000328

AC:

AN:

152260

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000121

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000504

AC:

AN:

238072

Hom.:

AF XY:

0.0000462

AC XY:

AN XY:

129980

show subpopulations

Gnomad AFR exome

AF:

0.0000690

Gnomad AMR exome

AF:

0.0000592

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.000101

Gnomad FIN exome

AF:

0.000239

Gnomad NFE exome

AF:

0.00000942

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000240

AC:

AN:

1456574

Hom.:

Cov.:

AF XY:

0.0000345

AC XY:

AN XY:

724220

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000452

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.000152

Gnomad4 FIN exome

AF:

0.000116

Gnomad4 NFE exome

AF:

0.0000126

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000328

AC:

AN:

152260

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74386

show subpopulations

Gnomad4 AFR

AF:

0.000121

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:

0.00

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000329

Hom.:

Bravo

AF:

0.0000378

ESP6500AA

AF:

0.000239

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.0000414

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not provided

Uncertain:1

Oct 24, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces arginine, which is basic and polar, with cysteine, which is neutral and slightly polar, at codon 22 of the FSCN2 protein (p.Arg22Cys). This variant is present in population databases (rs368996304, gnomAD 0.02%). This variant has not been reported in the literature in individuals affected with FSCN2-related conditions. ClinVar contains an entry for this variant (Variation ID: 935971). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.098

BayesDel_addAF

Benign

0.0093

BayesDel_noAF

Uncertain

-0.020

CADD

Uncertain

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.54

D;.

Eigen

Uncertain

0.57

Eigen_PC

Uncertain

0.51

FATHMM_MKL

Uncertain

0.92

LIST_S2

Uncertain

0.96

D;D

M_CAP

Uncertain

0.21

MetaRNN

Pathogenic

0.83

D;D

MetaSVM

Benign

-0.85

MutationAssessor

Uncertain

2.8

M;M

PrimateAI

Uncertain

0.56

PROVEAN

Pathogenic

-5.3

D;D

REVEL

Uncertain

0.46

Sift

Pathogenic

0.0

D;D

Sift4G

Pathogenic

0.0

D;D

Polyphen

1.0

D;.

Vest4

0.74

MVP

0.73

MPC

0.48

ClinPred

0.85

GERP RS

5.1

Varity_R

0.66

gMVP

0.80

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