1-10232362-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP2 PP3

The NM_001365951.3(KIF1B):c.34G>T(p.Val12Leu) 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 Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. V12V) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: KIF1B NM_001365951.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 9.28

Genes affected

KIF1B (HGNC:16636): (kinesin family member 1B) Predicted to enable microtubule binding activity and plus-end-directed microtubule motor activity. Predicted to be involved in chemical synaptic transmission; dense core granule cytoskeletal transport; and vesicle-mediated transport. Predicted to act upstream of or within mitochondrion transport along microtubule. Predicted to be located in cytoplasmic vesicle membrane and neuron projection. Predicted to be part of kinesin complex. Predicted to be active in several cellular components, including axon; dendrite; and microtubule. Implicated in Charcot-Marie-Tooth disease type 2A1; carcinoma (multiple); multiple sclerosis; neuroblastoma; and pheochromocytoma. Biomarker of hepatocellular carcinoma. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, KIF1B
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.822

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
KIF1B	NM_001365951.3	c.34G>T	p.Val12Leu	missense_variant	2/49	ENST00000676179.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
KIF1B	ENST00000676179.1	c.34G>T	p.Val12Leu	missense_variant	2/49		NM_001365951.3	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

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

Ambry Genetics

Sep 23, 2020

The p.V12L variant (also known as c.34G>T), located in coding exon 1 of the KIF1B gene, results from a G to T substitution at nucleotide position 34. The valine at codon 12 is replaced by leucine, an amino acid with highly similar properties. This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.96
BayesDel_addAF	Pathogenic	0.36	D
BayesDel_noAF	Pathogenic	0.29
Cadd	Pathogenic	27
Dann	Uncertain	1.0
Eigen	Pathogenic	0.89
Eigen_PC	Pathogenic	0.87
FATHMM_MKL	Pathogenic	0.99	D
M_CAP	Benign	0.051	D
MetaRNN	Pathogenic	0.82	D;D;D;D;D;D;D
MetaSVM	Uncertain	0.43	D
MutationAssessor	Uncertain	2.4	M;M;M;M;M;.;.
MutationTaster	Benign	1.0	D;D;D;D;D
PrimateAI	Pathogenic	0.85	D
PROVEAN	Uncertain	-2.9	D;D;D;D;D;.;.
REVEL	Pathogenic	0.79
Sift	Uncertain	0.0010	D;D;D;D;D;.;.
Sift4G	Uncertain	0.0070	D;D;D;D;D;D;D
Polyphen		0.96	D;P;P;D;.;D;.
Vest4		0.72
MutPred		0.70		Loss of methylation at K7 (P = 0.0769);Loss of methylation at K7 (P = 0.0769);Loss of methylation at K7 (P = 0.0769);Loss of methylation at K7 (P = 0.0769);Loss of methylation at K7 (P = 0.0769);Loss of methylation at K7 (P = 0.0769);Loss of methylation at K7 (P = 0.0769);
MVP		0.91
MPC		1.8
ClinPred		0.99	D
GERP RS		5.4
Varity_R		0.89
gMVP		0.75

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: chr1-10292420;