Genetic Variant ISOC2:p.Leu158Phe (chr19-55455054-G-A) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

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

The NM_001136201.2(ISOC2):c.472C>T(p.Leu158Phe) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000118 in 1,613,454 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: 𝑓 0.000033 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0000096 ( 0 hom. )

Consequence

ISOC2
NM_001136201.2 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 3.12

Variant links:

Genes affected

ISOC2 (HGNC:26278): (isochorismatase domain containing 2) Involved in protein destabilization. Located in cytoplasm and nucleus. [provided by Alliance of Genome Resources, Apr 2022]

ISOC2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ISOC2	NM_001136201.2 link	c.472C>T	p.Leu158Phe	missense_variant	Exon 5 of 6	ENST00000425675.7	NP_001129673.1	Q96AB3-1
ISOC2	NM_024710.3 link	c.520C>T	p.Leu174Phe	missense_variant	Exon 5 of 6		NP_078986.1	Q96AB3-2
ISOC2	NM_001136202.2 link	c.262C>T	p.Leu88Phe	missense_variant	Exon 4 of 5		NP_001129674.1	Q96AB3-3
ISOC2	XM_047439445.1 link	c.310C>T	p.Leu104Phe	missense_variant	Exon 4 of 5		XP_047295401.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ISOC2	ENST00000425675.7 link	c.472C>T	p.Leu158Phe	missense_variant	Exon 5 of 6	1	NM_001136201.2	ENSP00000401726.1		Q96AB3-1

Frequencies

GnomAD3 genomes

AF:

0.0000329

AC:

AN:

152180

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000196

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:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000160

AC:

AN:

250176

Hom.:

AF XY:

0.00000737

AC XY:

AN XY:

135696

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000290

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000109

Gnomad SAS exome

AF:

0.0000327

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000958

AC:

AN:

1461274

Hom.:

Cov.:

AF XY:

0.00000688

AC XY:

AN XY:

726948

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000447

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000504

Gnomad4 SAS exome

AF:

0.0000116

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000719

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.0000329

AC:

AN:

152180

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74340

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.000196

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000227

ExAC

AF:

0.00000824

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Jan 07, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.520C>T (p.L174F) alteration is located in exon 5 (coding exon 4) of the ISOC2 gene. This alteration results from a C to T substitution at nucleotide position 520, causing the leucine (L) at amino acid position 174 to be replaced by a phenylalanine (F). 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

Uncertain

0.51

BayesDel_addAF

Benign

-0.080

BayesDel_noAF

Benign

-0.13

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Benign

0.22

.;T;.;T;T

Eigen

Uncertain

0.65

Eigen_PC

Uncertain

0.52

FATHMM_MKL

Benign

0.70

LIST_S2

Uncertain

0.92

D;D;D;D;D

M_CAP

Uncertain

0.14

MetaRNN

Uncertain

0.57

D;D;D;D;D

MetaSVM

Uncertain

0.25

MutationAssessor

Pathogenic

3.3

.;M;.;.;.

PrimateAI

Uncertain

0.58

PROVEAN

Uncertain

-2.8

D;D;D;.;.

REVEL

Uncertain

0.39

Sift

Uncertain

0.0030

D;D;D;.;.

Sift4G

Uncertain

0.0070

D;D;D;.;.

Polyphen

1.0

D;D;D;.;.

Vest4

0.72

MutPred

0.68

.;Gain of catalytic residue at L158 (P = 0.1918);.;Gain of catalytic residue at L158 (P = 0.1918);Gain of catalytic residue at L158 (P = 0.1918);

MVP

0.45

MPC

0.45

ClinPred

0.86

GERP RS

4.0

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

2.1

Varity_R

0.39

gMVP

0.63

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.020

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