chr2-240721004-G-T

Position:

• chr2-240721004-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 3P and 1B. PM2 PP2 BP4

The NM_001244008.2(KIF1A):​c.4778C>A​(p.Pro1593Gln) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P1593L) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 33)
• Consequence: KIF1A NM_001244008.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 6.14

Genes affected

KIF1A (HGNC:888): (kinesin family member 1A) The protein encoded by this gene is a member of the kinesin family and functions as an anterograde motor protein that transports membranous organelles along axonal microtubules. Mutations at this locus have been associated with spastic paraplegia-30 and hereditary sensory neuropathy IIC. Alternatively spliced transcript variants encoding distinct isoforms have been described. [provided by RefSeq, Apr 2012]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, KIF1A
• BP4: Computational evidence support a benign effect (MetaRNN=0.3625967).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
KIF1A	NM_001244008.2	c.4778C>A	p.Pro1593Gln	missense_variant	45/49	ENST00000498729.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
KIF1A	ENST00000498729.9	c.4778C>A	p.Pro1593Gln	missense_variant	45/49	5	NM_001244008.2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

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

Jun 01, 2022

Variant summary: KIF1A c.4475C>A (p.Pro1492Gln) results in a non-conservative amino acid change in the encoded protein sequence. Three of five in-silico tools predict a damaging effect of the variant on protein function. The variant was absent in 243116 control chromosomes (gnomAD). The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance. To our knowledge, no occurrence of c.4475C>A in individuals affected with NESCAV Syndrome and no experimental evidence demonstrating its impact on protein function have been reported. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014. Based on the evidence outlined above, the variant was classified as uncertain significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.13
BayesDel_addAF	Benign	-0.024	T
BayesDel_noAF	Benign	-0.27
CADD	Uncertain	24
DANN	Uncertain	0.98
DEOGEN2	Uncertain	0.52	D;.;.;.;.;.;.;D;.;.;.;.;.;.
Eigen	Benign	0.14
Eigen_PC	Benign	0.19
FATHMM_MKL	Uncertain	0.92	D
M_CAP	Benign	0.048	D
MetaRNN	Benign	0.36	T;T;T;T;T;T;T;T;T;T;T;T;T;T
MetaSVM	Benign	-0.40	T
MutationAssessor	Benign	1.8	L;.;.;.;.;.;.;L;.;.;.;.;.;.
MutationTaster	Benign	0.84	D;D
PrimateAI	Uncertain	0.52	T
Polyphen		0.60	P;.;.;.;.;.;.;P;.;.;.;.;.;.
Vest4		0.50
MutPred		0.29		Gain of solvent accessibility (P = 0.007);.;.;.;.;.;.;Gain of solvent accessibility (P = 0.007);.;.;.;.;.;.;
MVP		0.50
MPC		0.97
ClinPred		0.88	D
GERP RS		4.2
Varity_R		0.12
gMVP		0.38

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr2-241660421;