2-163609923-C-T

Variant names:

• chr2-163609923-C-T
• rs1691197029
• NM_018086.4:c.1909G>A

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2 PP3_Strong

The NM_018086.4(FIGN):​c.1909G>A​(p.Asp637Asn) variant causes a missense change. The variant allele was found at a frequency of 0.00000616 in 1,461,752 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: 0.0000062 (0 hom.)
• Consequence: FIGN NM_018086.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 6.33

Genes affected

FIGN (HGNC:13285): (fidgetin, microtubule severing factor) Predicted to enable microtubule-severing ATPase activity. Predicted to be involved in cytoplasmic microtubule organization. Predicted to act upstream of or within locomotory behavior. Predicted to be located in nuclear matrix. Predicted to be active in nucleus. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.979

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
FIGN	NM_018086.4	c.1909G>A	p.Asp637Asn	missense_variant	Exon 3 of 3	ENST00000333129.4	NP_060556.2
FIGN	NM_001321825.2	c.1876G>A	p.Asp626Asn	missense_variant	Exon 2 of 2		NP_001308754.1
FIGN	XM_047444863.1	c.1987G>A	p.Asp663Asn	missense_variant	Exon 3 of 3		XP_047300819.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
FIGN	ENST00000333129.4	c.1909G>A	p.Asp637Asn	missense_variant	Exon 3 of 3	1	NM_018086.4	ENSP00000333836.3
FIGN	ENST00000409634.5	c.26-16127G>A		intron_variant	Intron 2 of 2	5		ENSP00000386768.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000616 AC: 9 AN: 1461752 Hom.: 0 Cov.: 38 AF XY: 0.00000138 AC XY: 1 AN XY: 727184

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000447

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000116

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000540

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

Dec 21, 2022

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.1909G>A (p.D637N) alteration is located in exon 3 (coding exon 2) of the FIGN gene. This alteration results from a G to A substitution at nucleotide position 1909, causing the aspartic acid (D) at amino acid position 637 to be replaced by an asparagine (N). 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	Benign	0.13
BayesDel_addAF	Pathogenic	0.21	D
BayesDel_noAF	Uncertain	0.070
CADD	Pathogenic	31
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.87	D
Eigen	Pathogenic	0.94
Eigen_PC	Pathogenic	0.88
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.96	D
M_CAP	Pathogenic	0.33	D
MetaRNN	Pathogenic	0.98	D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	3.8	H
PrimateAI	Uncertain	0.77	T
PROVEAN	Pathogenic	-4.5	D
REVEL	Pathogenic	0.86
Sift	Uncertain	0.0040	D
Sift4G	Uncertain	0.022	D
Polyphen		1.0	D
Vest4		0.67
MutPred		0.91		Gain of ubiquitination at K632 (P = 0.1181);
MVP		0.87
MPC		0.67
ClinPred		1.0	D
GERP RS		5.8
Varity_R		0.53
gMVP		0.62

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: rs1691197029; hg19: chr2-164466433;