4-54732008-A-T

Variant names:

• chr4-54732008-A-T
• rs1214231397
• NM_000222.3:c.2361+10A>T

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 0P and 4B. BP4_Strong

The NM_000222.3(KIT):​c.2361+10A>T variant causes a intron change involving the alteration of a non-conserved nucleotide. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: 𝑓 0.0000070 (0 hom., cov: 32)
  • Exomes 𝑓: 0.0000038 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: KIT NM_000222.3 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.472
• Publications: 0 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: 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

ACMG classification

Our verdict: Likely_benign. The variant received -4 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.75).

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

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	KIT	NM_000222.3	MANE Select	c.2361+10A>T		intron	N/A	NP_000213.1	P10721-1
	KIT	NM_001385284.1		c.2364+10A>T		intron	N/A	NP_001372213.1	A0A8I5KS03
	KIT	NM_001385290.1		c.2361+10A>T		intron	N/A	NP_001372219.1	A0A8I5QKP7

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	KIT	ENST00000288135.6	TSL:1 MANE Select	c.2361+10A>T		intron	N/A	ENSP00000288135.6	P10721-1
	KIT	ENST00000412167.7	TSL:1	c.2349+10A>T		intron	N/A	ENSP00000390987.3	A0A8J8Z860
	KIT	ENST00000687109.1		c.2364+10A>T		intron	N/A	ENSP00000509371.1	A0A8I5KS03

Frequencies

GnomAD3 genomes AF: 0.00000698 AC: 1 AN: 143276 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000230

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD4 exome Data not reliable, filtered out with message: AS_VQSR AF: 0.00000377 AC: 5 AN: 1327086 Hom.: 0 Cov.: 35 AF XY: 0.00000301 AC XY: 2 AN XY: 663540

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

African (AFR) AF: 0.00 AC: 0 AN: 31356

American (AMR) AF: 0.00 AC: 0 AN: 43234

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 24034

East Asian (EAS) AF: 0.00 AC: 0 AN: 36132

South Asian (SAS) AF: 0.00 AC: 0 AN: 84186

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 49828

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5254

European-Non Finnish (NFE) AF: 0.00000501 AC: 5 AN: 998244

Other (OTH) AF: 0.00 AC: 0 AN: 54818

⚠️ 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.

GnomAD4 genome Data not reliable, filtered out with message: AS_VQSR AF: 0.00000698 AC: 1 AN: 143348 Hom.: 0 Cov.: 32 AF XY: 0.0000144 AC XY: 1 AN XY: 69240

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

African (AFR) AF: 0.00 AC: 0 AN: 39360

American (AMR) AF: 0.00 AC: 0 AN: 14280

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3402

East Asian (EAS) AF: 0.00 AC: 0 AN: 4518

South Asian (SAS) AF: 0.000231 AC: 1 AN: 4330

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 8316

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 266

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 65992

Other (OTH) AF: 0.00 AC: 0 AN: 1996

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5. (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.75
CADD	Benign	5.5
DANN	Benign	0.79
PhyloP100		-0.47

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.040		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: rs1214231397; hg19: chr4-55598174;