rs773709702

Positions:

• chr4-54738513-A-C
• chr4-54738513-A-G
• chr4-54738513-A-T

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 3P and 2B. PM2 PP2 BP4_Moderate

The ENST00000288135.6(KIT):​c.2887A>C​(p.Thr963Pro) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 12/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. T963S) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: KIT ENST00000288135.6 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 6.13

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), KIT. . Gene score misZ 2.5806 (greater than the threshold 3.09). Trascript score misZ 4.1549 (greater than threshold 3.09). GenCC has associacion of gene with piebaldism, gastrointestinal stromal tumor, mastocytosis, cutaneous mastocytosis.
• BP4: Computational evidence support a benign effect (MetaRNN=0.15583989).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
KIT	NM_000222.3	c.2887A>C	p.Thr963Pro	missense_variant	21/21	ENST00000288135.6	NP_000213.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
KIT	ENST00000288135.6	c.2887A>C	p.Thr963Pro	missense_variant	21/21	1	NM_000222.3	ENSP00000288135	P4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.080
BayesDel_addAF	Benign	-0.039	T
BayesDel_noAF	Benign	-0.29
CADD	Uncertain	23
DANN	Uncertain	0.99
DEOGEN2	Benign	0.26	.;T
Eigen	Benign	-0.071
Eigen_PC	Benign	0.11
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Benign	0.85	D;D
M_CAP	Benign	0.062	D
MetaRNN	Benign	0.16	T;T
MetaSVM	Benign	-0.59	T
MutationAssessor	Benign	0.69	.;N
MutationTaster	Benign	0.98	N;N
PrimateAI	Benign	0.37	T
PROVEAN	Benign	-0.86	N;N
REVEL	Uncertain	0.35
Sift	Uncertain	0.021	D;D
Sift4G	Uncertain	0.044	D;D
Polyphen		0.13	B;B
Vest4		0.097
MutPred		0.13		.;Gain of glycosylation at S959 (P = 0.0288);
MVP		0.67
MPC		0.68
ClinPred		0.84	D
GERP RS		5.7
Varity_R		0.22
gMVP		0.36

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: rs773709702; hg19: chr4-55604679;