6-109735199-C-T

Variant names:

Variant summary

Our verdict is Pathogenic. The variant received 16 ACMG points: 16P and 0B. PVS1PP5_Very_Strong

The NM_014845.6(FIG4):c.547C>T(p.Arg183*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000261 in 1,612,104 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 (★★). Variant results in nonsense mediated mRNA decay.

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000027 ( 0 hom. )

Consequence

FIG4
NM_014845.6 stop_gained

Scores

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:7U:1

Conservation

PhyloP100: 1.38

Publications

9 publications found

Variant links:

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]

FIG4 Gene-Disease associations (from GenCC):

Charcot-Marie-Tooth disease
Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen, Illumina
Charcot-Marie-Tooth disease type 4J
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet, Ambry Genetics, Laboratory for Molecular Medicine
Yunis-Varon syndrome
Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet, G2P
amyotrophic lateral sclerosis type 11
Inheritance: Unknown, AD Classification: STRONG, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), ClinGen, Genomics England PanelApp
amyotrophic lateral sclerosis
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
bilateral parasagittal parieto-occipital polymicrogyria
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

FIG4 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Pathogenic. The variant received 16 ACMG points.

PVS1

Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.

PP5

Variant 6-109735199-C-T is Pathogenic according to our data. Variant chr6-109735199-C-T is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 1723.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
FIG4	NM_014845.6 link	c.547C>T	p.Arg183*	stop_gained	Exon 6 of 23	ENST00000230124.8	NP_055660.1
FIG4	XM_011536281.4 link	c.484C>T	p.Arg162*	stop_gained	Exon 6 of 23		XP_011534583.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
FIG4	ENST00000230124.8 link	c.547C>T	p.Arg183*	stop_gained	Exon 6 of 23	1	NM_014845.6	ENSP00000230124.4

Frequencies

GnomAD3 genomes

AF:

0.0000131

AC:

AN:

152092

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

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:

0.0000294

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000279

AC:

AN:

250950

AF XY:

0.0000369

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000441

Gnomad OTH exome

AF:

0.000164

GnomAD4 exome

AF:

0.0000274

AC:

AN:

1460012

Hom.:

Cov.:

AF XY:

0.0000262

AC XY:

AN XY:

726476

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33400

American (AMR)

AF:

0.00

AC:

AN:

44672

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26106

East Asian (EAS)

AF:

0.00

AC:

AN:

39664

South Asian (SAS)

AF:

0.0000348

AC:

AN:

86226

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53390

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5758

European-Non Finnish (NFE)

AF:

0.0000333

AC:

AN:

1110472

Other (OTH)

AF:

0.00

AC:

AN:

60324

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.453

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0000131

AC:

AN:

152092

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74304

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41416

American (AMR)

AF:

0.00

AC:

AN:

15256

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3468

East Asian (EAS)

AF:

0.00

AC:

AN:

5188

South Asian (SAS)

AF:

0.00

AC:

AN:

4828

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10608

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.0000294

AC:

AN:

68010

Other (OTH)

AF:

0.00

AC:

AN:

2090

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.525

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.0000350

Hom.:

Bravo

AF:

0.0000227

ExAC

AF:

0.0000247

AC:

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:7Uncertain:1

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Charcot-Marie-Tooth disease type 4J

Pathogenic:2Uncertain:1

Jul 05, 2007

OMIM

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:literature only

Jan 06, 2016

Inherited Neuropathy Consortium Ii, University Of Miami

Significance:Uncertain significance

Review Status:no assertion criteria provided

Collection Method:literature only

Apr 15, 2024

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Variant summary: FIG4 c.547C>T (p.Arg183X) results in a premature termination codon, predicted to cause a truncation of the encoded protein or absence of the protein due to nonsense mediated decay, which are commonly known mechanisms for disease. The variant allele was found at a frequency of 2.8e-05 in 250950 control chromosomes (gnomAD). c.547C>T has been reported in the literature in individuals affected with Charcot-Marie Disease Type 4J (example: Chow_2007). The following publication has been ascertained in the context of this evaluation (PMID: 17572665). ClinVar contains an entry for this variant (Variation ID: 1723). Based on the evidence outlined above, the variant was classified as pathogenic.

Amyotrophic lateral sclerosis type 11

Pathogenic:1

Jan 01, 2009

OMIM

Significance:Pathogenic

Review Status:flagged submission

Collection Method:literature only

Amyotrophic lateral sclerosis

Pathogenic:1

Mar 31, 2020

Suna and Inan Kirac Foundation Neurodegeneration Research Laboratory, Koc University

Significance:Likely pathogenic

Review Status:criteria provided, single submitter

Collection Method:research

not provided

Pathogenic:1

Jun 17, 2015

GeneDx

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The R183X nonsense variant in the FIG4 gene has been reported previously in association with CMT4J (Chow et al., 2007). Heterozygosity for the R183X mutation is also reported to be a risk factor for developing amyotrophic lateral sclerosis (ALS) (Chow et al., 2009). This variant is predicted to cause loss of normal protein function either through protein truncation or nonsense-mediated mRNA decay.

FIG4-related disorder

Pathogenic:1

Jan 03, 2024

PreventionGenetics, part of Exact Sciences

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:clinical testing

The FIG4 c.547C>T variant is predicted to result in premature protein termination (p.Arg183*). This variant has been reported in the compound heterozygous state in siblings with Charcot-Marie-Tooth disease type 4J (Fig. 4b, Chow et al. 2007. PubMed ID: 17572665). It has also been reported in an individual with amyotrophic lateral sclerosis (Table A5, Tunca et al. 2020. PubMed ID: 32579787). This variant is reported in 0.0044% of alleles in individuals of European (Non-Finnish) descent in gnomAD. Nonsense variants in FIG4 are expected to be pathogenic. This variant is interpreted as pathogenic for autosomal recessive Charcot-Marie-Tooth disease type 4J.

Charcot-Marie-Tooth disease type 4

Pathogenic:1

Jan 30, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change creates a premature translational stop signal (p.Arg183*) in the FIG4 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in FIG4 are known to be pathogenic (PMID: 23623387, 30740813). This variant is present in population databases (rs121908288, gnomAD 0.005%). This premature translational stop signal has been observed in individual(s) with Charcot-Marie-Tooth disease, type 4 (PMID: 17572665). This variant is also known as c.718C>T. ClinVar contains an entry for this variant (Variation ID: 1723). For these reasons, this variant has been classified as Pathogenic.

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.52

BayesDel_noAF

Pathogenic

0.59

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.0

.;.;.

Eigen

Uncertain

0.50

Eigen_PC

Uncertain

0.32

FATHMM_MKL

Uncertain

0.86

LIST_S2

Benign

0.0

.;.;.

MetaRNN

Benign

0.0

.;.;.

MutationAssessor

Benign

0.0

.;.;.

PhyloP100

1.4

PROVEAN

Benign

0.0

.;.;.

REVEL

Benign

0.0

Sift

Pathogenic

0.0

.;.;.

Sift4G

Pathogenic

0.0

.;.;.

Vest4

0.87

GERP RS

0.82

Mutation Taster

=2/198

disease causing (ClinVar)

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.030

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over