rs876657698

chr3-69959284-G-Achr3-69959284-G-T

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_001354604.2(MITF):c.1043G>A(p.Trp348Ter) 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 Pathogenic (★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: MITF NM_001354604.2 stop_gained
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 10.0

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]

ACMG classification

Verdict is Pathogenic. Variant got 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 3-69959284-G-A is Pathogenic according to our data. Variant chr3-69959284-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 228362.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MITF	NM_001354604.2	c.1043G>A	p.Trp348Ter	stop_gained	9/10	ENST00000352241.9
MITF	NM_000248.4	c.722G>A	p.Trp241Ter	stop_gained	8/9	ENST00000394351.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MITF	ENST00000352241.9	c.1043G>A	p.Trp348Ter	stop_gained	9/10	1	NM_001354604.2	P4
MITF	ENST00000394351.9	c.722G>A	p.Trp241Ter	stop_gained	8/9	1	NM_000248.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Rare genetic deafness Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Jun 21, 2016

The p.Trp342X variant in MITF has been reported by our laboratory in one individ ual with hearing loss and features of Waardenburg syndrome and segregated in two affected relatives. It has not been identified in large population studies. Th is nonsense variant leads to a premature termination codon at position 342, whic h is predicted to lead to a truncated or absent protein. Heterozygous loss-of-fu nction variants in the MITF gene are well described in individuals with Waardenb urg syndrome. In summary, this variant meets our criteria to be classified as p athogenic based on segregation with disease, consistent clinical features, extre mely low frequency in the general population, and predicted impact on the protei n. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.66
Cadd	Pathogenic	47
Dann	Uncertain	1.0
Eigen	Pathogenic	1.3
Eigen_PC	Pathogenic	1.2
FATHMM_MKL	Pathogenic	0.99	D
MutationTaster	Benign	1.0	A;A;A;A;A;A;A;A;A
Vest4		0.99
GERP RS		5.9

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: rs876657698; hg19: chr3-70008435;