rs1554307877

Variant names:

• chr6-109786364-A-G
• rs1554307877
• NM_014845.6:c.2011A>G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_014845.6(FIG4):​c.2011A>G​(p.Ile671Val) variant causes a missense change. The variant allele was found at a frequency of 0.000000684 in 1,461,458 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign 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: FIG4 NM_014845.6 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:2
• Conservation: PhyloP100: 4.00

Genes affected

FIG4 (HGNC:16873): (FIG4 phosphoinositide 5-phosphatase) The protein encoded by this gene belongs to the SAC domain-containing protein gene family. The SAC domain, approximately 400 amino acids in length and consisting of seven conserved motifs, has been shown to possess phosphoinositide phosphatase activity. The yeast homolog, Sac1p, is involved in the regulation of various phosphoinositides, and affects diverse cellular functions such as actin cytoskeleton organization, Golgi function, and maintenance of vacuole morphology. Membrane-bound phosphoinositides function as signaling molecules and play a key role in vesicle trafficking in eukaryotic cells. Mutations in this gene have been associated with Charcot-Marie-Tooth disease, type 4J. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.11835721).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
FIG4	NM_014845.6	c.2011A>G	p.Ile671Val	missense_variant	Exon 18 of 23	ENST00000230124.8	NP_055660.1
FIG4	XM_011536281.4	c.1948A>G	p.Ile650Val	missense_variant	Exon 18 of 23		XP_011534583.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
FIG4	ENST00000230124.8	c.2011A>G	p.Ile671Val	missense_variant	Exon 18 of 23	1	NM_014845.6	ENSP00000230124.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461458 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 727070

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: 9.00e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000756

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, single submitter

Submissions by phenotype

FIG4-related disorder Uncertain:1

Feb 06, 2024

PreventionGenetics, part of Exact Sciences

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

The FIG4 c.2011A>G variant is predicted to result in the amino acid substitution p.Ile671Val. To our knowledge, this variant has not been reported in the literature or in a large population database, indicating this variant is rare. At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Charcot-Marie-Tooth disease type 4 Uncertain:1

Aug 27, 2021

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces isoleucine with valine at codon 671 of the FIG4 protein (p.Ile671Val). The isoleucine residue is moderately conserved and there is a small physicochemical difference between isoleucine and valine. This variant is not present in population databases (ExAC no frequency). This variant has not been reported in the literature in individuals affected with FIG4-related conditions. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated. Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site. 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	0.074
BayesDel_addAF	Benign	-0.18	T
BayesDel_noAF	Benign	-0.50
CADD	Benign	16
DANN	Uncertain	0.98
DEOGEN2	Benign	0.19	T
Eigen	Benign	-0.31
Eigen_PC	Benign	-0.089
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Benign	0.77	T
M_CAP	Benign	0.0072	T
MetaRNN	Benign	0.12	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	0.81	L
PrimateAI	Benign	0.45	T
PROVEAN	Benign	-0.25	N
REVEL	Benign	0.028
Sift	Benign	0.22	T
Sift4G	Benign	0.41	T
Polyphen		0.0010	B
Vest4		0.11
MutPred		0.37		Loss of ubiquitination at K666 (P = 0.1668);
MVP		0.21
MPC		0.26
ClinPred		0.44	T
GERP RS		4.6
Varity_R		0.080
gMVP		0.28

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: rs1554307877; hg19: chr6-110107567;