rs387907038

Positions:

• chr14-104703108-T-C
• chr14-104703108-T-G

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PM1 PM2 PM5 PP3_Strong PP5_Very_Strong

The NM_022489.4(INF2):​c.395T>C​(p.Leu132Pro) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. L132R) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 34)
• Consequence: INF2 NM_022489.4 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:3 U:1
• Conservation: PhyloP100: 7.96

Genes affected

INF2 (HGNC:23791): (inverted formin 2) This gene represents a member of the formin family of proteins. It is considered a diaphanous formin due to the presence of a diaphanous inhibitory domain located at the N-terminus of the encoded protein. Studies of a similar mouse protein indicate that the protein encoded by this locus may function in polymerization and depolymerization of actin filaments. Mutations at this locus have been associated with focal segmental glomerulosclerosis 5.[provided by RefSeq, Aug 2010]

ACMG classification

Verdict is Pathogenic. Variant got 18 ACMG points.

• PM1: In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 3 uncertain in NM_022489.4
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr14-104703108-T-G is described in ClinVar as [Pathogenic]. Clinvar id is 30868.Status of the report is no_assertion_criteria_provided, 0 stars.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.948
• PP5: Variant 14-104703108-T-C is Pathogenic according to our data. Variant chr14-104703108-T-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 637706.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
INF2	NM_022489.4	c.395T>C	p.Leu132Pro	missense_variant	3/23	ENST00000392634.9
INF2	NM_001031714.4	c.395T>C	p.Leu132Pro	missense_variant	3/22
INF2	NM_032714.3	c.395T>C	p.Leu132Pro	missense_variant	3/5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
INF2	ENST00000392634.9	c.395T>C	p.Leu132Pro	missense_variant	3/23	5	NM_022489.4	P4

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 34

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:3 Uncertain:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Focal segmental glomerulosclerosis 5;C4302667:Charcot-Marie-Tooth disease dominant intermediate E Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Aug 08, 2020

This variant disrupts the p.Leu132 amino acid residue in INF2. Other variant(s) that disrupt this residue have been observed in individuals with INF2-related conditions (PMID: 22187985), which suggests that this may be a clinically significant amino acid residue. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt INF2 protein function. This variant has been observed in individual(s) with Charcot-Marie-Tooth disease and focal segmental glomerulosclerosis (PMID: 24750328, Invitae). In at least one individual the variant was observed to be de novo. ClinVar contains an entry for this variant (Variation ID: 637706). This variant is not present in population databases (ExAC no frequency). This sequence change replaces leucine with proline at codon 132 of the INF2 protein (p.Leu132Pro). The leucine residue is highly conserved and there is a moderate physicochemical difference between leucine and proline. For these reasons, this variant has been classified as Pathogenic. -

Inborn genetic diseases Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

Nov 21, 2023

The c.395T>C (p.L132P) alteration is located in exon 3 (coding exon 2) of the INF2 gene. This alteration results from a T to C substitution at nucleotide position 395, causing the leucine (L) at amino acid position 132 to be replaced by a proline (P). This variant was not reported in population-based cohorts in the Genome Aggregation Database (gnomAD). This variant has been reported as de novo in an individual with features of Charcot-Marie-Tooth disease and focal segmental glomerulosclerosis (Park, 2014; Park, 2023). This amino acid position is highly conserved in available vertebrate species. This missense alteration is located in a region that has a low rate of benign missense variation (Lek, 2016; Firth, 2009). In multiple assays testing INF2 function, this variant showed functionally abnormal results (Bayraktar, 2020). This alteration is predicted to be deleterious by in silico analysis. Based on the available evidence, this alteration is classified as pathogenic. -

not provided Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

GeneDx

May 19, 2022

In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Not observed at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 24750328, 22965130) -

Charcot-Marie-Tooth disease Uncertain:1

Uncertain significance, no assertion criteria provided

literature only

Inherited Neuropathy Consortium

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- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
BayesDel_addAF	Pathogenic	0.52	D
BayesDel_noAF	Pathogenic	0.51
CADD	Pathogenic	31
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.78	.;.;D
Eigen	Uncertain	0.66
Eigen_PC	Uncertain	0.57
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.87	D;D;D
M_CAP	Pathogenic	0.78	D
MetaRNN	Pathogenic	0.95	D;D;D
MetaSVM	Uncertain	0.68	D
MutationAssessor	Uncertain	2.8	M;M;M
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Uncertain	0.72	T
PROVEAN	Pathogenic	-5.9	D;D;D
REVEL	Pathogenic	0.94
Sift	Pathogenic	0.0	D;D;D
Sift4G	Pathogenic	0.0010	D;D;D
Polyphen		1.0	D;.;D
Vest4		0.97
MutPred		0.70		Loss of stability (P = 0.0012);Loss of stability (P = 0.0012);Loss of stability (P = 0.0012);
MVP		1.0
MPC		3.1
ClinPred		0.99	D
GERP RS		4.3
Varity_R		0.94
gMVP		1.0

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: rs387907038; hg19: chr14-105169445;