chr2-240721043-G-A

Variant names:

Variant summary

Our verdict is Benign. The variant received -9 ACMG points: 0P and 9B. BP4_StrongBP6BS1

The NM_001379631.1(KIF1A):c.4819-5C>T variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000254 in 1,611,786 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00031 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00025 ( 0 hom. )

Consequence

KIF1A
NM_001379631.1 splice_region, intron

Scores

Splicing: ADA: 0.00002356

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2B:5

Conservation

PhyloP100: -0.434

Publications

1 publications found

Variant links:

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]

KIF1A Gene-Disease associations (from GenCC):

intellectual disability, autosomal dominant 9
Inheritance: AD Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), G2P
syndromic intellectual disability
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
neuropathy, hereditary sensory, type 2C
Inheritance: AR Classification: DEFINITIVE, STRONG, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, G2P
hereditary spastic paraplegia 30
Inheritance: AR, AD Classification: STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, Orphanet
autosomal dominant non-syndromic intellectual disability
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
PEHO syndrome
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
hereditary sensory and autonomic neuropathy type 2
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

KIF1A links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -9 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.84).

BP6

Variant 2-240721043-G-A is Benign according to our data. Variant chr2-240721043-G-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 335259.

BS1

Variant frequency is greater than expected in population eas. GnomAd4 allele frequency = 0.000309 (47/152338) while in subpopulation EAS AF = 0.00405 (21/5186). AF 95% confidence interval is 0.00271. There are 0 homozygotes in GnomAd4. There are 23 alleles in the male GnomAd4 subpopulation. Median coverage is 33. This position passed quality control check.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001379631.1. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank	Protein
KIF1A	NM_001244008.2	MANE Select	c.4744-5C>T	splice_region intron	N/A	NP_001230937.1
KIF1A	NM_001379631.1		c.4819-5C>T	splice_region intron	N/A	NP_001366560.1
KIF1A	NM_001379642.1		c.4744-5C>T	splice_region intron	N/A	NP_001366571.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank	Protein
KIF1A	ENST00000498729.9	TSL:5 MANE Select	c.4744-5C>T	splice_region intron	N/A	ENSP00000438388.1
KIF1A	ENST00000460788.5	TSL:1	n.1301-5C>T	splice_region intron	N/A
KIF1A	ENST00000492812.6	TSL:1	n.3327-5C>T	splice_region intron	N/A

Frequencies

GnomAD3 genomes

AF:

0.000309

AC:

AN:

152220

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000193

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000654

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00404

Gnomad SAS

AF:

0.000620

Gnomad FIN

AF:

0.0000941

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000191

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000360

AC:

AN:

244534

AF XY:

0.000360

show subpopulations

Gnomad AFR exome

AF:

0.000199

Gnomad AMR exome

AF:

0.0000583

Gnomad ASJ exome

AF:

0.000101

Gnomad EAS exome

AF:

0.00297

Gnomad FIN exome

AF:

0.000146

Gnomad NFE exome

AF:

0.000181

Gnomad OTH exome

AF:

0.000169

GnomAD4 exome

AF:

0.000249

AC:

363

AN:

1459448

Hom.:

Cov.:

AF XY:

0.000238

AC XY:

173

AN XY:

725912

show subpopulations

African (AFR)

AF:

0.0000896

AC:

AN:

33464

American (AMR)

AF:

0.0000224

AC:

AN:

44626

Ashkenazi Jewish (ASJ)

AF:

0.0000383

AC:

AN:

26102

East Asian (EAS)

AF:

0.00222

AC:

AN:

39670

South Asian (SAS)

AF:

0.000140

AC:

AN:

85980

European-Finnish (FIN)

AF:

0.0000958

AC:

AN:

52200

Middle Eastern (MID)

AF:

0.000177

AC:

AN:

5658

European-Non Finnish (NFE)

AF:

0.000208

AC:

231

AN:

1111460

Other (OTH)

AF:

0.000348

AC:

AN:

60288

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.470

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

100

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000309

AC:

AN:

152338

Hom.:

Cov.:

AF XY:

0.000309

AC XY:

AN XY:

74490

show subpopulations

African (AFR)

AF:

0.000192

AC:

AN:

41582

American (AMR)

AF:

0.0000653

AC:

AN:

15310

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00405

AC:

AN:

5186

South Asian (SAS)

AF:

0.000621

AC:

AN:

4832

European-Finnish (FIN)

AF:

0.0000941

AC:

AN:

10626

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.000191

AC:

AN:

68012

Other (OTH)

AF:

0.00

AC:

AN:

2112

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.505

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.000203

Hom.:

Bravo

AF:

0.000242

Asia WGS

AF:

0.00202

AC:

AN:

3478

EpiCase

AF:

0.000164

EpiControl

AF:

0.000178

ClinVar

ClinVar submissions as Germline

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

not provided (2)

not specified (2)

Hereditary spastic paraplegia 30 (1)

KIF1A-related disorder (1)

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

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.84

CADD

Benign

1.0

(source)

DANN

Benign

0.55

PhyloP100

-0.43

PromoterAI

-0.018

Neutral

(source)

Mutation Taster

=100/0

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.000024

dbscSNV1_RF

Benign

0.0040

SpliceAI score (max)

0.020

Details are displayed if max score is > 0.2

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

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over