chr2-240723958-G-A

Variant names:

• chr2-240723958-G-A
• rs138964333
• NM_001244008.2:c.4318+17C>T

Variant summary

Our verdict is Benign. The variant received -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BS1 BS2

The NM_001244008.2(KIF1A):​c.4318+17C>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00928 in 1,607,566 control chromosomes in the GnomAD database, including 83 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0069 (4 hom., cov: 33)
  • Exomes 𝑓: 0.0095 (79 hom.)
• Consequence: KIF1A NM_001244008.2 intron
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:5
• Conservation: PhyloP100: -0.355
• Publications: 2 publications found

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

ACMG classification

Our verdict: Benign. The variant received -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.86).
• BP6: Variant 2-240723958-G-A is Benign according to our data. Variant chr2-240723958-G-A is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 445966.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BS1: Variant frequency is greater than expected in population nfe. GnomAd4 allele frequency = 0.00687 (1046/152358) while in subpopulation NFE AF = 0.0118 (806/68030). AF 95% confidence interval is 0.0112. There are 4 homozygotes in GnomAd4. There are 491 alleles in the male GnomAd4 subpopulation. Median coverage is 33. This position passed quality control check.
• BS2: High Homozygotes in GnomAd4 at 4 AR,AD gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001244008.2. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	KIF1A	NM_001244008.2	MANE Select	c.4318+17C>T		intron	N/A	NP_001230937.1
	KIF1A	NM_001379631.1		c.4393+17C>T		intron	N/A	NP_001366560.1
	KIF1A	NM_001379642.1		c.4318+17C>T		intron	N/A	NP_001366571.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	KIF1A	ENST00000498729.9	TSL:5 MANE Select	c.4318+17C>T		intron	N/A	ENSP00000438388.1
	KIF1A	ENST00000460788.5	TSL:1	n.875+17C>T		intron	N/A
	KIF1A	ENST00000492812.6	TSL:1	n.2901+17C>T		intron	N/A

Frequencies

GnomAD3 genomes AF: 0.00687 AC: 1046 AN: 152240 Hom.: 4 Cov.: 33

Gnomad AFR AF: 0.00142

Gnomad AMI AF: 0.00219

Gnomad AMR AF: 0.00157

Gnomad ASJ AF: 0.0135

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00434

Gnomad FIN AF: 0.00696

Gnomad MID AF: 0.00316

Gnomad NFE AF: 0.0118

Gnomad OTH AF: 0.00575

GnomAD2 exomes AF: 0.00715 AC: 1774 AN: 248080 AF XY: 0.00722

Gnomad AFR exome AF: 0.00137

Gnomad AMR exome AF: 0.00128

Gnomad ASJ exome AF: 0.0165

Gnomad EAS exome AF: 0.000167

Gnomad FIN exome AF: 0.00706

Gnomad NFE exome AF: 0.0111

Gnomad OTH exome AF: 0.00565

GnomAD4 exome AF: 0.00953 AC: 13874 AN: 1455208 Hom.: 79 Cov.: 30 AF XY: 0.00951 AC XY: 6885 AN XY: 724294

African (AFR) AF: 0.00153 AC: 51 AN: 33402

American (AMR) AF: 0.00136 AC: 61 AN: 44700

Ashkenazi Jewish (ASJ) AF: 0.0165 AC: 432 AN: 26104

East Asian (EAS) AF: 0.0000756 AC: 3 AN: 39666

South Asian (SAS) AF: 0.00358 AC: 308 AN: 86148

European-Finnish (FIN) AF: 0.00721 AC: 376 AN: 52122

Middle Eastern (MID) AF: 0.000522 AC: 3 AN: 5752

European-Non Finnish (NFE) AF: 0.0110 AC: 12172 AN: 1107136

Other (OTH) AF: 0.00778 AC: 468 AN: 60178

GnomAD4 genome AF: 0.00687 AC: 1046 AN: 152358 Hom.: 4 Cov.: 33 AF XY: 0.00659 AC XY: 491 AN XY: 74508

African (AFR) AF: 0.00142 AC: 59 AN: 41584

American (AMR) AF: 0.00157 AC: 24 AN: 15310

Ashkenazi Jewish (ASJ) AF: 0.0135 AC: 47 AN: 3472

East Asian (EAS) AF: 0.00 AC: 0 AN: 5184

South Asian (SAS) AF: 0.00434 AC: 21 AN: 4834

European-Finnish (FIN) AF: 0.00696 AC: 74 AN: 10628

Middle Eastern (MID) AF: 0.00340 AC: 1 AN: 294

European-Non Finnish (NFE) AF: 0.0118 AC: 806 AN: 68030

Other (OTH) AF: 0.00569 AC: 12 AN: 2110

Alfa AF: 0.0104 Hom.: 1

Bravo AF: 0.00638

Asia WGS AF: 0.00144 AC: 5 AN: 3478

ClinVar

ClinVar submissions as Germline

Significance: Benign/Likely benign

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	-	4	not provided (4)
-	-	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	-0.86
CADD	Benign	0.79
DANN	Benign	0.66
PhyloP100		-0.35
Mutation Taster		=100/0	polymorphism

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

Other links and lift over

dbSNP: rs138964333; hg19: chr2-241663375;