rs1441080561

Positions:

• chr2-240760762-C-A
• chr2-240760762-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP2

The NM_001244008.2(KIF1A):​c.2347G>T​(p.Asp783Tyr) variant causes a missense change. The variant allele was found at a frequency of 0.00000069 in 1,450,204 control chromosomes in the GnomAD database, with no homozygous occurrence. 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. D783H) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: KIF1A NM_001244008.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.50

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 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, KIF1A

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
KIF1A	NM_001244008.2	c.2347G>T	p.Asp783Tyr	missense_variant	25/49	ENST00000498729.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
KIF1A	ENST00000498729.9	c.2347G>T	p.Asp783Tyr	missense_variant	25/49	5	NM_001244008.2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.90e-7 AC: 1 AN: 1450204 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 720726

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: 9.03e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Neuropathy, hereditary sensory, type 2C;C5235139:Hereditary spastic paraplegia 30;C5393830:Intellectual disability, autosomal dominant 9 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

May 16, 2023

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. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on KIF1A protein function. ClinVar contains an entry for this variant (Variation ID: 532863). This variant has not been reported in the literature in individuals affected with KIF1A-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces aspartic acid, which is acidic and polar, with tyrosine, which is neutral and polar, at codon 774 of the KIF1A protein (p.Asp774Tyr). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.24
BayesDel_addAF	Uncertain	0.035	T
BayesDel_noAF	Benign	-0.19
CADD	Pathogenic	26
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.68	D;.;.;.;.;.;.;D;.;.;.;.;.
Eigen	Uncertain	0.26
Eigen_PC	Uncertain	0.28
FATHMM_MKL	Uncertain	0.91	D
M_CAP	Uncertain	0.13	D
MetaRNN	Uncertain	0.44	T;T;T;T;T;T;T;T;T;T;T;T;T
MetaSVM	Benign	-0.34	T
MutationAssessor	Benign	1.6	L;.;.;.;.;.;.;L;.;.;.;.;.
MutationTaster	Benign	1.0	D;D
PrimateAI	Uncertain	0.65	T
Polyphen		0.43	B;.;.;.;.;.;.;B;.;.;.;.;P
Vest4		0.48, 0.51
MutPred		0.32		Gain of phosphorylation at D774 (P = 0.0333);.;Gain of phosphorylation at D774 (P = 0.0333);.;.;Gain of phosphorylation at D774 (P = 0.0333);Gain of phosphorylation at D774 (P = 0.0333);Gain of phosphorylation at D774 (P = 0.0333);Gain of phosphorylation at D774 (P = 0.0333);.;Gain of phosphorylation at D774 (P = 0.0333);.;.;
MVP		0.60
MPC		0.55
ClinPred		0.98	D
GERP RS		4.0
Varity_R		0.43
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

Other links and lift over

dbSNP: rs1441080561; hg19: chr2-241700179;