chr7-127595848-A-T

Position:

• chr7-127595848-A-T

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_020369.3(FSCN3):​c.686A>T​(p.Asp229Val) variant causes a missense change. The variant allele was found at a frequency of 0.000000684 in 1,461,506 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: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: FSCN3 NM_020369.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.73

Genes affected

FSCN3 (HGNC:3961): (fascin actin-bundling protein 3) Predicted to enable actin filament binding activity. Predicted to be involved in actin filament bundle assembly; cell migration; and establishment or maintenance of cell polarity. Predicted to be located in cytoskeleton. Predicted to be active in several cellular components, including lamellipodium; microvillus; and ruffle. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.889

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
FSCN3	NM_020369.3	c.686A>T	p.Asp229Val	missense_variant	2/7	ENST00000265825.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
FSCN3	ENST00000265825.6	c.686A>T	p.Asp229Val	missense_variant	2/7	1	NM_020369.3	P1
FSCN3	ENST00000478821.1	c.284A>T	p.Asp95Val	missense_variant	2/3	5
FSCN3	ENST00000469242.1	n.408A>T		non_coding_transcript_exon_variant	1/2	3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461506 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 727022

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

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Feb 17, 2024

The c.686A>T (p.D229V) alteration is located in exon 2 (coding exon 2) of the FSCN3 gene. This alteration results from a A to T substitution at nucleotide position 686, causing the aspartic acid (D) at amino acid position 229 to be replaced by a valine (V). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.58
BayesDel_addAF	Pathogenic	0.24	D
BayesDel_noAF	Uncertain	0.10
CADD	Uncertain	25
DANN	Uncertain	0.99
DEOGEN2	Benign	0.28	T;.
Eigen	Uncertain	0.55
Eigen_PC	Uncertain	0.58
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Benign	0.81	T;T
M_CAP	Benign	0.049	D
MetaRNN	Pathogenic	0.89	D;D
MetaSVM	Benign	-0.62	T
MutationAssessor	Uncertain	2.7	M;.
MutationTaster	Benign	1.0	D;D
PrimateAI	Benign	0.46	T
PROVEAN	Pathogenic	-7.5	D;.
REVEL	Uncertain	0.44
Sift	Pathogenic	0.0	D;.
Sift4G	Pathogenic	0.0	D;D
Polyphen		0.96	D;.
Vest4		0.84
MutPred		0.77		Loss of sheet (P = 0.1398);.;
MVP		0.77
MPC		0.46
ClinPred		1.0	D
GERP RS		5.4
Varity_R		0.78
gMVP		0.77

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.040		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: rs755675031; hg19: chr7-127235902;