chr12-32619725-C-A

Variant names:

Variant summary

Our verdict is Benign. Variant got -10 ACMG points: 1P and 11B. PP3BP4_ModerateBP6BS1BS2

The NM_001370298.3(FGD4):c.1777C>A(p.Pro593Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.002 in 1,613,932 control chromosomes in the GnomAD database, including 8 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.0015 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0020 ( 8 hom. )

Consequence

FGD4
NM_001370298.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:4B:7

Conservation

PhyloP100: 7.32

Variant links:

Genes affected

FGD4 (HGNC:19125): (FYVE, RhoGEF and PH domain containing 4) This gene encodes a protein that is involved in the regulation of the actin cytoskeleton and cell shape. This protein contains an actin filament-binding domain, which together with its Dbl homology domain and one of its pleckstrin homology domains, can form microspikes. This protein can activate MAPK8 independently of the actin filament-binding domain, and it is also involved in the activation of CDC42 via the exchange of bound GDP for free GTP. The activation of CDC42 also enables this protein to play a role in mediating the cellular invasion of Cryptosporidium parvum, an intracellular parasite that infects the gastrointestinal tract. Mutations in this gene can cause Charcot-Marie-Tooth disease type 4H (CMT4H), a disorder of the peripheral nervous system. Multiple alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jan 2015]

FGD4 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -10 ACMG points.

PP3

Multiple lines of computational evidence support a deleterious effect 8: AlphaMissense, BayesDel_noAF, Cadd, Eigen, MutationAssessor, PrimateAI, PROVEAN, REVEL [when BayesDel_addAF, max_spliceai, FATHMM_MKL, M_CAP, MetaRNN, MutationTaster was below the threshold]

BP4

Computational evidence support a benign effect (MetaRNN=0.20303556).

BP6

Variant 12-32619725-C-A is Benign according to our data. Variant chr12-32619725-C-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 188187.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=6, Uncertain_significance=4}. Variant chr12-32619725-C-A is described in Lovd as [Likely_benign].

BS1

Variant frequency is greater than expected in population nfe. gnomad4 allele frequency = 0.00155 (235/152044) while in subpopulation NFE AF= 0.0026 (177/68020). AF 95% confidence interval is 0.00229. There are 0 homozygotes in gnomad4. There are 105 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.

BS2

High Homozygotes in GnomAdExome4 at 8 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
FGD4	NM_001370298.3 link	c.1777C>A	p.Pro593Thr	missense_variant	Exon 11 of 17	ENST00000534526.7	NP_001357227.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
FGD4	ENST00000534526.7 link	c.1777C>A	p.Pro593Thr	missense_variant	Exon 11 of 17	5	NM_001370298.3	ENSP00000449273.1		F8VWL3

Frequencies

GnomAD3 genomes

AF:

0.00155

AC:

235

AN:

152044

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000483

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000393

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000193

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00274

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00260

Gnomad OTH

AF:

0.000957

GnomAD3 exomes

AF:

0.00140

AC:

351

AN:

251470

Hom.:

AF XY:

0.00138

AC XY:

188

AN XY:

135906

show subpopulations

Gnomad AFR exome

AF:

0.000492

Gnomad AMR exome

AF:

0.0000867

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00139

Gnomad NFE exome

AF:

0.00268

Gnomad OTH exome

AF:

0.000815

GnomAD4 exome

AF:

0.00205

AC:

2995

AN:

1461888

Hom.:

Cov.:

AF XY:

0.00200

AC XY:

1458

AN XY:

727246

show subpopulations

Gnomad4 AFR exome

AF:

0.000358

Gnomad4 AMR exome

AF:

0.000246

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000116

Gnomad4 FIN exome

AF:

0.00146

Gnomad4 NFE exome

AF:

0.00254

Gnomad4 OTH exome

AF:

0.00116

GnomAD4 genome

AF:

0.00155

AC:

235

AN:

152044

Hom.:

Cov.:

AF XY:

0.00141

AC XY:

105

AN XY:

74242

show subpopulations

Gnomad4 AFR

AF:

0.000483

Gnomad4 AMR

AF:

0.000393

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000193

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00274

Gnomad4 NFE

AF:

0.00260

Gnomad4 OTH

AF:

0.000957

Alfa

AF:

0.00194

Hom.:

Bravo

AF:

0.00144

TwinsUK

AF:

0.00270

AC:

ALSPAC

AF:

0.00182

AC:

ESP6500AA

AF:

0.000908

AC:

ESP6500EA

AF:

0.00163

AC:

ExAC

AF:

0.00145

AC:

176

EpiCase

AF:

0.00180

EpiControl

AF:

0.00213

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:4Benign:7

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:1Benign:2

Jan 01, 2025

CeGaT Center for Human Genetics Tuebingen

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

FGD4: PP3, BS1 -

Jul 20, 2023

GeneDx

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

See Variant Classification Assertion Criteria. -

Dec 29, 2021

Mayo Clinic Laboratories, Mayo Clinic

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Charcot-Marie-Tooth disease type 4H

Uncertain:2

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Jun 17, 2021

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The FGD4 c.1366C>A; p.Pro456Thr variant (rs138160928), to our knowledge, is not reported in the medical literature but is reported in ClinVar (Variation ID: 188187). This variant is found in the non-Finnish European population with an overall allele frequency of 0.27% (344/129172 alleles, including one homozygote) in the Genome Aggregation Database. The proline at codon 456 is highly conserved, and computational analyses predict that this variant is deleterious (REVEL: 0.717). However, due to limited information, the clinical significance of the p.Pro456Thr variant is uncertain at this time. -

not specified

Uncertain:1Benign:1

Jan 17, 2017

Athena Diagnostics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Apr 30, 2024

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

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: FGD4 c.1366C>A (p.Pro456Thr) results in a non-conservative amino acid change located in the Pleckstrin homology domain (IPR001849) of the encoded protein sequence. Five of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 0.0014 in 251470 control chromosomes, predominantly at a frequency of 0.0027 within the Non-Finnish European subpopulation in the gnomAD database, including 1 homozygotes. c.1366C>A has been reported in the literature in individuals affected with inherited peripheral neuropaty without strong evidence for causality (Atoniadi_2015). These report(s) do not provide unequivocal conclusions about association of the variant with Charcot-Marie Disease Type 4H. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. This variant is also known as c.177C>A (p.P593T). The following publication have been ascertained in the context of this evaluation (PMID: 26392352). ClinVar contains an entry for this variant (Variation ID: 188187). Based on the evidence outlined above, the variant was classified as likely benign. -

Charcot-Marie-Tooth disease

Benign:1

Molecular Genetics Laboratory, London Health Sciences Centre

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Inborn genetic diseases

Benign:1

Oct 28, 2019

Ambry Genetics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

FGD4-related disorder

Benign:1

Mar 22, 2021

PreventionGenetics, part of Exact Sciences

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Charcot-Marie-Tooth disease type 4

Benign:1

Jan 29, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.59

BayesDel_addAF

Benign

-0.0017

BayesDel_noAF

Pathogenic

0.22

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.55

D;D;D;D;D

Eigen

Pathogenic

0.92

Eigen_PC

Pathogenic

0.89

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Pathogenic

0.99

D;D;D;D;D

M_CAP

Benign

0.078

MetaRNN

Benign

0.20

T;T;T;T;T

MetaSVM

Uncertain

0.47

MutationAssessor

Pathogenic

3.1

.;.;M;.;.

PrimateAI

Pathogenic

0.84

PROVEAN

Pathogenic

-7.6

D;D;D;D;D

REVEL

Pathogenic

0.72

Sift

Uncertain

0.0010

D;D;D;D;D

Sift4G

Uncertain

0.0030

D;D;D;D;D

Polyphen

1.0, 1.0

.;D;D;.;D

Vest4

0.85

MVP

0.92

MPC

1.1

ClinPred

0.16

GERP RS

5.7

Varity_R

0.77

gMVP

0.71

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