4-54737280-T-G

Variant names:

• chr4-54737280-T-G
• rs764592751
• NM_000222.3:c.2802T>G

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 3P and 3B. PM2 PP2 BP4_Moderate BP6

The NM_001385284.1(KIT):​c.2805T>G​(p.His935Gln) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000694 in 1,440,086 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 19/24 in silico tools predict 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). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. H935R) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: KIT NM_001385284.1 missense, splice_region
• Scores: Splicing: ADA: 0.00003364
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:1
• Conservation: PhyloP100: -0.649
• Publications: 1 publications found

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: Genomics England PanelApp, Labcorp Genetics (formerly Invitae), Orphanet, ClinGen, Ambry Genetics
• piebaldism

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: PanelApp Australia, Ambry Genetics, G2P, Labcorp Genetics (formerly Invitae), Orphanet, Genomics England PanelApp
• 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

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• 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: 4.1411 (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=0.07859281).
• BP6: Variant 4-54737280-T-G is Benign according to our data. Variant chr4-54737280-T-G is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 409731.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001385284.1. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	KIT	NM_000222.3	MANE Select	c.2802T>G	p.His934Gln	missense splice_region	Exon 20 of 21	NP_000213.1
	KIT	NM_001385284.1		c.2805T>G	p.His935Gln	missense splice_region	Exon 20 of 21	NP_001372213.1
	KIT	NM_001385290.1		c.2802T>G	p.His934Gln	missense splice_region	Exon 20 of 21	NP_001372219.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	KIT	ENST00000288135.6	TSL:1 MANE Select	c.2802T>G	p.His934Gln	missense splice_region	Exon 20 of 21	ENSP00000288135.6
	KIT	ENST00000412167.7	TSL:1	c.2790T>G	p.His930Gln	missense splice_region	Exon 20 of 21	ENSP00000390987.3
	KIT	ENST00000687109.1		c.2805T>G	p.His935Gln	missense splice_region	Exon 20 of 21	ENSP00000509371.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.94e-7 AC: 1 AN: 1440086 Hom.: 0 Cov.: 28 AF XY: 0.00 AC XY: 0 AN XY: 717936

African (AFR) AF: 0.00 AC: 0 AN: 33050

American (AMR) AF: 0.00 AC: 0 AN: 44690

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25980

East Asian (EAS) AF: 0.00 AC: 0 AN: 39594

South Asian (SAS) AF: 0.00 AC: 0 AN: 85816

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53404

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5716

European-Non Finnish (NFE) AF: 9.16e-7 AC: 1 AN: 1092258

Other (OTH) AF: 0.00 AC: 0 AN: 59578

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions as Germline

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

Pathogenic	VUS	Benign	Condition
-	1	-	Gastrointestinal stromal tumor (1)
-	-	1	Hereditary cancer-predisposing syndrome (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.14
BayesDel_addAF	Benign	-0.18	T
BayesDel_noAF	Benign	-0.50
CADD	Benign	0.092
DANN	Benign	0.44
DEOGEN2	Benign	0.25	T
Eigen	Benign	-1.7
Eigen_PC	Benign	-1.7
FATHMM_MKL	Benign	0.41	N
LIST_S2	Benign	0.63	T
M_CAP	Benign	0.043	D
MetaRNN	Benign	0.079	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.83	L
PhyloP100		-0.65
PrimateAI	Benign	0.39	T
PROVEAN	Benign	-1.3	N
REVEL	Benign	0.14
Sift	Benign	0.35	T
Sift4G	Benign	1.0	T
Polyphen		0.0020	B
Vest4		0.15
MutPred		0.24		Gain of glycosylation at Y936 (P = 0.0532)
MVP		0.67
MPC		0.45
ClinPred		0.22	T
GERP RS		-8.4
Varity_R		0.085
gMVP		0.41
Mutation Taster		=56/44	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.000034
dbscSNV1_RF	Benign	0.052
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: rs764592751; hg19: chr4-55603446;