Genetic Variant NM_000222.3:c.1195G>A (chr4-54709503-G-A) – ACMG Classification: Benign (-12 pts)

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 1P and 13B. PP2BP4_StrongBP6BS1BS2

The NM_000222.3(KIT):c.1195G>A(p.Val399Ile) variant causes a missense change. The variant allele was found at a frequency of 0.00102 in 1,612,138 control chromosomes in the GnomAD database, including 3 homozygotes. In-silico tool predicts a benign outcome for this variant. 14/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V399F) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00057 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0011 ( 3 hom. )

Consequence

KIT
NM_000222.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:4B:8O:1

Conservation

PhyloP100: 6.17

Publications

24 publications found

Variant links:

Genes affected

KIT (HGNC:6342): (KIT proto-oncogene, receptor tyrosine kinase) This gene encodes a receptor tyrosine kinase. This gene was initially identified as a homolog of the feline sarcoma viral oncogene v-kit and is often referred to as proto-oncogene c-Kit. The canonical form of this glycosylated transmembrane protein has an N-terminal extracellular region with five immunoglobulin-like domains, a transmembrane region, and an intracellular tyrosine kinase domain at the C-terminus. Upon activation by its cytokine ligand, stem cell factor (SCF), this protein phosphorylates multiple intracellular proteins that play a role in in the proliferation, differentiation, migration and apoptosis of many cell types and thereby plays an important role in hematopoiesis, stem cell maintenance, gametogenesis, melanogenesis, and in mast cell development, migration and function. This protein can be a membrane-bound or soluble protein. Mutations in this gene are associated with gastrointestinal stromal tumors, mast cell disease, acute myelogenous leukemia, and piebaldism. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, May 2020]

KIT Gene-Disease associations (from GenCC):

gastrointestinal stromal tumor
Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Ambry Genetics, ClinGen, Genomics England PanelApp, Orphanet, Labcorp Genetics (formerly Invitae)
piebaldism
Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Genomics England PanelApp, Ambry Genetics, G2P, Orphanet, Labcorp Genetics (formerly Invitae)
cutaneous mastocytosis
Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
mastocytosis
Inheritance: AD Classification: STRONG, MODERATE Submitted by: Genomics England PanelApp, Ambry Genetics

KIT links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -12 ACMG points.

PP2

Missense variant in the KIT gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 54 curated pathogenic missense variants (we use a threshold of 10). The gene has 7 curated benign missense variants. Gene score misZ: 2.5806 (below the threshold of 3.09). Trascript score misZ: 4.1549 (above the threshold of 3.09). GenCC associations: The gene is linked to cutaneous mastocytosis, gastrointestinal stromal tumor, mastocytosis, piebaldism.

BP4

Computational evidence support a benign effect (MetaRNN=0.06799027).

BP6

Variant 4-54709503-G-A is Benign according to our data. Variant chr4-54709503-G-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 134629.

BS1

Variant frequency is greater than expected in population nfe. GnomAd4 allele frequency = 0.000571 (87/152330) while in subpopulation NFE AF = 0.0011 (75/68024). AF 95% confidence interval is 0.000902. There are 0 homozygotes in GnomAd4. There are 40 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High AC in GnomAd4 at 87 AD gene.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000222.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
KIT	NM_000222.3	MANE Select	c.1195G>A	p.Val399Ile	missense	Exon 7 of 21	NP_000213.1	P10721-1
KIT	NM_001385284.1		c.1198G>A	p.Val400Ile	missense	Exon 7 of 21	NP_001372213.1	A0A8I5KS03
KIT	NM_001385290.1		c.1198G>A	p.Val400Ile	missense	Exon 7 of 21	NP_001372219.1	A0A8I5QKP7

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
KIT	ENST00000288135.6	TSL:1 MANE Select	c.1195G>A	p.Val399Ile	missense	Exon 7 of 21	ENSP00000288135.6	P10721-1
KIT	ENST00000412167.7	TSL:1	c.1198G>A	p.Val400Ile	missense	Exon 7 of 21	ENSP00000390987.3	A0A8J8Z860
KIT	ENST00000687109.1		c.1198G>A	p.Val400Ile	missense	Exon 7 of 21	ENSP00000509371.1	A0A8I5KS03

Frequencies

GnomAD3 genomes

AF:

0.000572

AC:

AN:

152212

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000290

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:

0.00110

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000517

AC:

130

AN:

251448

AF XY:

0.000508

show subpopulations

Gnomad AFR exome

AF:

0.000308

Gnomad AMR exome

AF:

0.000347

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000544

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000976

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.00107

AC:

1558

AN:

1459808

Hom.:

Cov.:

AF XY:

0.00100

AC XY:

729

AN XY:

726448

show subpopulations

African (AFR)

AF:

0.000179

AC:

AN:

33438

American (AMR)

AF:

0.000335

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26122

East Asian (EAS)

AF:

0.00

AC:

AN:

39682

South Asian (SAS)

AF:

0.0000116

AC:

AN:

86214

European-Finnish (FIN)

AF:

0.0000187

AC:

AN:

53406

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00134

AC:

1490

AN:

1110138

Other (OTH)

AF:

0.000746

AC:

AN:

60316

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.456

Heterozygous variant carriers

130

195

260

325

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

120

180

240

300

<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:

0.000571

AC:

AN:

152330

Hom.:

Cov.:

AF XY:

0.000537

AC XY:

AN XY:

74498

show subpopulations

African (AFR)

AF:

0.000289

AC:

AN:

41572

American (AMR)

AF:

0.00

AC:

AN:

15300

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5190

South Asian (SAS)

AF:

0.00

AC:

AN:

4830

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10622

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00110

AC:

AN:

68024

Other (OTH)

AF:

0.00

AC:

AN:

2116

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.481

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:

0.000938

Hom.:

Bravo

AF:

0.000518

TwinsUK

AF:

0.00189

AC:

ALSPAC

AF:

0.000778

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000698

AC:

ExAC

AF:

0.000461

AC:

EpiCase

AF:

0.000654

EpiControl

AF:

0.00136

ClinVar

ClinVar submissions

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

not provided (5)

Gastrointestinal stromal tumor (3)

Hereditary cancer-predisposing syndrome (1)

KIT-related disorder (1)

Mastocytosis (1)

Piebaldism (1)

not specified (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.089

BayesDel_addAF

Benign

-0.47

BayesDel_noAF

Benign

-0.45

CADD

Uncertain

(source)

DANN

Benign

0.97

DEOGEN2

Benign

0.24

Eigen

Benign

-0.055

Eigen_PC

Benign

0.010

FATHMM_MKL

Uncertain

0.88

LIST_S2

Uncertain

0.90

M_CAP

Benign

0.015

MetaRNN

Benign

0.068

MetaSVM

Benign

-0.88

MutationAssessor

Uncertain

2.2

PhyloP100

6.2

PrimateAI

Benign

0.37

PROVEAN

Benign

-0.65

REVEL

Benign

0.21

Sift

Uncertain

0.026

Sift4G

Benign

0.18

Polyphen

0.060

Vest4

0.30

MVP

0.66

MPC

0.37

ClinPred

0.049

GERP RS

5.9

Varity_R

0.13

gMVP

0.60

Mutation Taster

=97/3

polymorphism

(source)

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

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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