Genetic Variant KIF2A:c.335-11_335-9delTTT (chr5-62352567-ATTT-A) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_001098511.3(KIF2A):c.335-11_335-9delTTT variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000446 in 1,119,914 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000031 ( 0 hom. )

Consequence

KIF2A
NM_001098511.3 intron

Scores

Not classified

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 0.297

Publications

0 publications found

Variant links:

Genes affected

KIF2A (HGNC:6318): (kinesin family member 2A) The protein encoded by this gene is a plus end-directed motor required for normal mitotic progression. The encoded protein is required for normal spindle activity during mitosis and is necessary for normal brain development. Several transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Sep 2011]

KIF2A links:

ENSG00000288643 (HGNC:):

ENSG00000288643 links:

DIMT1 (HGNC:30217): (DIM1 rRNA methyltransferase and ribosome maturation factor) The protein encoded by this gene is a methyltransferase that is responsible for dimethylation of adjacent adenosines near the 18S rRNA decoding site. The encoded protein is essential for ribosome biogenesis, although its catalytic activity is not involved in the process. The yeast ortholog of this protein functions in the cytoplasm while this protein functions in the nucleus. [provided by RefSeq, Jan 2017]

DIMT1 links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	Effect	Exon rank	MANE	Protein	UniProt
KIF2A	NM_001098511.3 link	c.335-11_335-9delTTT	intron_variant	Intron 4 of 20	ENST00000407818.8	NP_001091981.1	O00139-4
KIF2A	NM_004520.5 link	c.335-11_335-9delTTT	intron_variant	Intron 4 of 19		NP_004511.2	O00139-3
KIF2A	NM_001243953.2 link	c.335-11_335-9delTTT	intron_variant	Intron 4 of 19		NP_001230882.1	A0A6Q8PFA6B0AZS5
KIF2A	NM_001243952.2 link	c.254-11_254-9delTTT	intron_variant	Intron 5 of 20		NP_001230881.2	O00139-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KIF2A	ENST00000407818.8 link	c.335-20_335-18delTTT		intron_variant	Intron 4 of 20	1	NM_001098511.3	ENSP00000385000.3		O00139-4
ENSG00000288643	ENST00000509663.2 link	n.64+46032_64+46034delTTT		intron_variant	Intron 1 of 5	3		ENSP00000502199.1		A0A6Q8PGD0

Frequencies

GnomAD3 genomes

AF:

0.0000135

AC:

AN:

148150

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000493

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.00000309

AC:

AN:

971764

Hom.:

AF XY:

0.00000417

AC XY:

AN XY:

479776

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

20446

American (AMR)

AF:

0.00

AC:

AN:

18510

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

16524

East Asian (EAS)

AF:

0.00

AC:

AN:

24396

South Asian (SAS)

AF:

0.00

AC:

AN:

52166

European-Finnish (FIN)

AF:

0.00

AC:

AN:

36162

Middle Eastern (MID)

AF:

0.00

AC:

AN:

4334

European-Non Finnish (NFE)

AF:

0.00000263

AC:

AN:

759142

Other (OTH)

AF:

0.0000249

AC:

AN:

40084

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.225

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome 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

GnomAD4 genome

AF:

0.0000135

AC:

AN:

148150

Hom.:

Cov.:

AF XY:

0.0000139

AC XY:

AN XY:

72066

show subpopulations

African (AFR)

AF:

0.0000493

AC:

AN:

40564

American (AMR)

AF:

0.00

AC:

AN:

14812

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3414

East Asian (EAS)

AF:

0.00

AC:

AN:

5112

South Asian (SAS)

AF:

0.00

AC:

AN:

4704

European-Finnish (FIN)

AF:

0.00

AC:

AN:

9604

Middle Eastern (MID)

AF:

0.00

AC:

AN:

308

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

66698

Other (OTH)

AF:

0.00

AC:

AN:

2026

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

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:

0.00

Hom.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

PhyloP100

0.30

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over