rs121434442

Variant names:

• chr12-57569274-C-T
• rs121434442
• NM_004984.4:c.838C>T

Variant summary

Our verdict is Pathogenic. The variant received 18 ACMG points: 18P and 0B. PM1 PM2 PM5 PP3_Strong PP5_Very_Strong

The NM_004984.4(KIF5A):​c.838C>T​(p.Arg280Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 13/22 in silico tools predict a damaging 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. R280H) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: KIF5A NM_004984.4 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:7
• Conservation: PhyloP100: 3.12
• Publications: 19 publications found

Genes affected

KIF5A (HGNC:6323): (kinesin family member 5A) This gene encodes a member of the kinesin family of proteins. Members of this family are part of a multisubunit complex that functions as a microtubule motor in intracellular organelle transport. Mutations in this gene cause autosomal dominant spastic paraplegia 10. [provided by RefSeq, Jul 2008]

KIF5A Gene-Disease associations (from GenCC):

• amyotrophic lateral sclerosis, susceptibility to, 25

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: ClinGen, Illumina, Labcorp Genetics (formerly Invitae)
• inherited neurodegenerative disorder

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• myoclonus, intractable, neonatal

  Inheritance: AD Classification: DEFINITIVE, STRONG, MODERATE, LIMITED Submitted by: Ambry Genetics, Illumina, G2P, Labcorp Genetics (formerly Invitae)
• hereditary spastic paraplegia 10

  Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Ambry Genetics, Orphanet, Genomics England PanelApp, Labcorp Genetics (formerly Invitae)
• autosomal dominant Charcot-Marie-Tooth disease type 2 due to KIF5A mutation

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Pathogenic. The variant received 18 ACMG points.

• PM1: In a hotspot region, there are 5 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 10 uncertain in NM_004984.4
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr12-57569275-G-A is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 37130.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.977
• PP5: Variant 12-57569274-C-T is Pathogenic according to our data. Variant chr12-57569274-C-T is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 6807.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
KIF5A	NM_004984.4	c.838C>T	p.Arg280Cys	missense_variant	Exon 10 of 29	ENST00000455537.7	NP_004975.2
KIF5A	NM_001354705.2	c.571C>T	p.Arg191Cys	missense_variant	Exon 7 of 26		NP_001341634.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KIF5A	ENST00000455537.7	c.838C>T	p.Arg280Cys	missense_variant	Exon 10 of 29	1	NM_004984.4	ENSP00000408979.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:7

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:3

Jun 17, 2021

Institute of Medical Genetics and Applied Genomics, University Hospital Tübingen

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Jan 01, 2019

CeGaT Center for Human Genetics Tuebingen

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Sep 26, 2022

Athena Diagnostics

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant appears to segregate with spastic paraplegia in at least one family. Functional studies showed that mutant proteins have reduced microtubule affinity but still possess the regulatory mechanisms (PMID: 18203753). This variant has not been reported in large, multi-ethnic general populations (http://gnomad.broadinstitute.org). -

Hereditary spastic paraplegia 10 Pathogenic:2

-

Paris Brain Institute, Inserm - ICM

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Aug 12, 2014

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Spastic paraplegia Pathogenic:1

Dec 29, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

For these reasons, this variant has been classified as Pathogenic. This variant disrupts the p.Arg280 amino acid residue in KIF5A. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 18853458, 25008398, 28832565, 29892902). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. Experimental studies have shown that this missense change affects KIF5A function (PMID: 18203753). Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be disruptive. ClinVar contains an entry for this variant (Variation ID: 6807). This missense change has been observed in individuals with KIF5A-related conditions (PMID: 15452312, 25008398, 31211173; Invitae). It has also been observed to segregate with disease in related individuals. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces arginine, which is basic and polar, with cysteine, which is neutral and slightly polar, at codon 280 of the KIF5A protein (p.Arg280Cys). -

Hereditary spastic paraplegia Pathogenic:1

Dec 12, 2016

Genome Diagnostics Laboratory, The Hospital for Sick Children

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.44	D
BayesDel_noAF	Pathogenic	0.39
CADD	Pathogenic	33
DANN	Pathogenic	1.0
DEOGEN2	Pathogenic	0.96	D;.
Eigen	Pathogenic	0.87
Eigen_PC	Pathogenic	0.72
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Pathogenic	0.99	D;D
M_CAP	Pathogenic	0.51	D
MetaRNN	Pathogenic	0.98	D;D
MetaSVM	Pathogenic	1.0	D
MutationAssessor	Pathogenic	4.7	H;.
PhyloP100		3.1
PrimateAI	Pathogenic	0.91	D
PROVEAN	Pathogenic	-7.5	D;D
REVEL	Pathogenic	0.90
Sift	Pathogenic	0.0	D;D
Sift4G	Pathogenic	0.0	D;D
Polyphen		1.0	D;.
Vest4		0.93
MutPred		0.87		Gain of catalytic residue at K283 (P = 2e-04);.;
MVP		0.98
MPC		3.0
ClinPred		1.0	D
GERP RS		4.2
Varity_R		0.92
gMVP		1.0
Mutation Taster		=4/96	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.090		Details are displayed if max score is > 0.2

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

Other links and lift over

dbSNP: rs121434442; hg19: chr12-57963057; COSMIC: COSV99673680;