3-69956496-G-T

Variant names:

• chr3-69956496-G-T
• rs147682682
• NM_001354604.2:c.997G>T

Variant summary

Our verdict is Pathogenic. The variant received 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_001354604.2(MITF):​c.997G>T​(p.Glu333*) variant causes a stop gained change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★). Synonymous variant affecting the same amino acid position (i.e. E333E) has been classified as Likely benign. Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: MITF NM_001354604.2 stop_gained
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 10.0
• Publications: 4 publications found

Genes affected

MITF (HGNC:7105): (melanocyte inducing transcription factor) The protein encoded by this gene is a transcription factor that contains both basic helix-loop-helix and leucine zipper structural features. The encoded protein regulates melanocyte development and is responsible for pigment cell-specific transcription of the melanogenesis enzyme genes. Heterozygous mutations in the this gene cause auditory-pigmentary syndromes, such as Waardenburg syndrome type 2 and Tietz syndrome. [provided by RefSeq, Aug 2017]

MITF Gene-Disease associations (from GenCC):

• Tietz syndrome

  Inheritance: AD Classification: DEFINITIVE, MODERATE, SUPPORTIVE Submitted by: G2P, Orphanet, Ambry Genetics
• Waardenburg syndrome type 2

  Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: Orphanet, ClinGen
• Waardenburg syndrome type 2A

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), PanelApp Australia, G2P, Ambry Genetics
• melanoma, cutaneous malignant, susceptibility to, 8

  Inheritance: AD Classification: STRONG, MODERATE, LIMITED Submitted by: Ambry Genetics, G2P, Labcorp Genetics (formerly Invitae)
• coloboma, osteopetrosis, microphthalmia, macrocephaly, albinism, and deafness

  Inheritance: AR Classification: STRONG Submitted by: PanelApp Australia, Labcorp Genetics (formerly Invitae), G2P
• renal cell carcinoma

  Inheritance: AD Classification: MODERATE Submitted by: Genomics England PanelApp
• Waardenburg syndrome

  Inheritance: AR Classification: MODERATE Submitted by: Ambry Genetics
• Waardenburg-Shah syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Pathogenic. The variant received 12 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 3-69956496-G-T is Pathogenic according to our data. Variant chr3-69956496-G-T is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 545016.Status of the report is criteria_provided_single_submitter, 1 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001354604.2. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MITF	NM_001354604.2	MANE Select	c.997G>T	p.Glu333*	stop_gained	Exon 8 of 10	NP_001341533.1
	MITF	NM_000248.4	MANE Plus Clinical	c.676G>T	p.Glu226*	stop_gained	Exon 7 of 9	NP_000239.1
	MITF	NM_001354605.2		c.994G>T	p.Glu332*	stop_gained	Exon 8 of 10	NP_001341534.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MITF	ENST00000352241.9	TSL:1 MANE Select	c.997G>T	p.Glu333*	stop_gained	Exon 8 of 10	ENSP00000295600.8
	MITF	ENST00000394351.9	TSL:1 MANE Plus Clinical	c.676G>T	p.Glu226*	stop_gained	Exon 7 of 9	ENSP00000377880.3
	MITF	ENST00000314557.10	TSL:1	c.658G>T	p.Glu220*	stop_gained	Exon 7 of 9	ENSP00000324246.6

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

Submissions by phenotype

MITF-related disorder Pathogenic:1

Nov 03, 2022

PreventionGenetics, part of Exact Sciences

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The MITF c.676G>T variant is predicted to result in premature protein termination (p.Glu226*). This variant was reported in an individual with Waardenburg syndrome 2A (Somashekar et al. 2019. PubMed ID: 30394532, alt nomenclature NM_198159.2:c.979G>T (p.Glu327*)). This variant has not been reported in a large population database (http://gnomad.broadinstitute.org), indicating this variant is rare. Nonsense variants in MITF are expected to be pathogenic. This variant is interpreted as likely pathogenic.

Waardenburg syndrome type 2A Pathogenic:1

May 15, 2018

Kasturba Medical College, Manipal, Kasturba Medical College, Manipal, Manipal Academy of Higher Education, Manipal, India

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: research

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.66
CADD	Pathogenic	46
DANN	Uncertain	1.0
Eigen	Pathogenic	1.2
Eigen_PC	Pathogenic	1.1
FATHMM_MKL	Pathogenic	0.99	D
PhyloP100		10
Vest4		0.96
GERP RS		5.1
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Mutation Taster		=0/200	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.070		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: rs147682682; hg19: chr3-70005647;