Genetic Variant KLC2:p.Glu433Asp (chr11-66265200-A-T) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

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

The NM_001318734.2(KLC2):c.1299A>T(p.Glu433Asp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000375 in 1,598,660 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0000035 ( 0 hom. )

Consequence

KLC2
NM_001318734.2 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 1.61

Variant links:

Genes affected

KLC2 (HGNC:20716): (kinesin light chain 2) The protein encoded by this gene is a light chain of kinesin, a molecular motor responsible for moving vesicles and organelles along microtubules. Defects in this gene are a cause of spastic paraplegia, optic atrophy, and neuropathy (SPOAN) syndrome. [provided by RefSeq, Mar 2016]

KLC2 links:

KLC2-AS1 (HGNC:40934): (KLC2 antisense RNA 1)

KLC2-AS1 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
KLC2	NM_001318734.2 link	c.1299A>T	p.Glu433Asp	missense_variant	Exon 11 of 16	ENST00000394067.7	NP_001305663.1	Q9H0B6-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KLC2	ENST00000394067.7 link	c.1299A>T	p.Glu433Asp	missense_variant	Exon 11 of 16	1	NM_001318734.2	ENSP00000377631.2		Q9H0B6-1

Frequencies

GnomAD3 genomes

AF:

0.00000661

AC:

AN:

151362

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000242

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000398

AC:

AN:

251178

Hom.:

AF XY:

0.00

AC XY:

AN XY:

135838

show subpopulations

Gnomad AFR exome

AF:

0.0000620

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000345

AC:

AN:

1447298

Hom.:

Cov.:

AF XY:

0.00000139

AC XY:

AN XY:

719612

show subpopulations

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:

0.00000363

Gnomad4 OTH exome

AF:

0.0000168

GnomAD4 genome

AF:

0.00000661

AC:

AN:

151362

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

73914

show subpopulations

Gnomad4 AFR

AF:

0.0000242

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000312

Hom.:

Bravo

AF:

0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not provided

Uncertain:1

Oct 05, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces glutamic acid, which is acidic and polar, with aspartic acid, which is acidic and polar, at codon 433 of the KLC2 protein (p.Glu433Asp). This variant is present in population databases (no rsID available, gnomAD 0.007%). This variant has not been reported in the literature in individuals affected with KLC2-related conditions. An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant¬†is likely to be tolerated. 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

0.13

BayesDel_addAF

Uncertain

0.11

BayesDel_noAF

Uncertain

0.10

CADD

Benign

DANN

Uncertain

1.0

DEOGEN2

Benign

0.067

T;T;.;T;.;T

Eigen

Benign

-0.046

Eigen_PC

Benign

-0.054

FATHMM_MKL

Benign

0.60

LIST_S2

Pathogenic

0.98

D;.;D;.;.;D

M_CAP

Uncertain

0.17

MetaRNN

Uncertain

0.51

D;D;D;D;D;D

MetaSVM

Uncertain

-0.14

MutationAssessor

Benign

1.9

L;L;.;L;.;.

PrimateAI

Uncertain

0.61

PROVEAN

Benign

-1.8

N;N;N;N;N;N

REVEL

Uncertain

0.60

Sift

Benign

0.10

T;T;T;T;T;T

Sift4G

Benign

0.13

T;T;T;T;T;T

Polyphen

0.13

B;B;.;B;.;P

Vest4

0.77

MutPred

0.23

Loss of loop (P = 0.1242);Loss of loop (P = 0.1242);.;Loss of loop (P = 0.1242);.;.;

MVP

0.95

MPC

0.58

ClinPred

0.35

GERP RS

2.0

Varity_R

0.34

gMVP

0.68

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