NM_001354604.2:c.773_785dupCGGGAAACTTGAT

Variant names:

• chr3-69949059-C-CTCGGGAAACTTGA
• rs1553703619
• NM_001354604.2:c.773_785dupCGGGAAACTTGAT

Variant summary

Our verdict is Pathogenic. The variant received 10 ACMG points: 10P and 0B. PVS1 PP5_Moderate

The NM_001354604.2(MITF):​c.773_785dupCGGGAAACTTGAT​(p.Asp263GlyfsTer5) variant causes a frameshift change. The variant was absent in control chromosomes in GnomAD project. It is difficult to determine the true allele frequency of this variant because it is of type INS_BIG, and the frequency of such variant types in population databases may be underestimated and unreliable. Variant has been reported in ClinVar as Pathogenic (★). Synonymous variant affecting the same amino acid position (i.e. I262I) has been classified as Likely benign. Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: MITF NM_001354604.2 frameshift
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 4.75
• Publications: 0 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 10 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PP5: Variant 3-69949059-C-CTCGGGAAACTTGA is Pathogenic according to our data. Variant chr3-69949059-C-CTCGGGAAACTTGA is described in ClinVar as Pathogenic. ClinVar VariationId is 505620.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

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MITF	NM_001354604.2	MANE Select	c.773_785dupCGGGAAACTTGAT	p.Asp263GlyfsTer5	frameshift	Exon 6 of 10	NP_001341533.1
	MITF	NM_000248.4	MANE Plus Clinical	c.452_464dupCGGGAAACTTGAT	p.Asp156GlyfsTer5	frameshift	Exon 5 of 9	NP_000239.1
	MITF	NM_001354605.2		c.770_782dupCGGGAAACTTGAT	p.Asp262GlyfsTer5	frameshift	Exon 6 of 10	NP_001341534.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MITF	ENST00000352241.9	TSL:1 MANE Select	c.773_785dupCGGGAAACTTGAT	p.Asp263GlyfsTer5	frameshift	Exon 6 of 10	ENSP00000295600.8
	MITF	ENST00000394351.9	TSL:1 MANE Plus Clinical	c.452_464dupCGGGAAACTTGAT	p.Asp156GlyfsTer5	frameshift	Exon 5 of 9	ENSP00000377880.3
	MITF	ENST00000314557.10	TSL:1	c.452_464dupCGGGAAACTTGAT	p.Asp156GlyfsTer5	frameshift	Exon 5 of 9	ENSP00000324246.6

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions as Germline

Significance: Pathogenic

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
1	-	-	Rare genetic deafness (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		4.8
Mutation Taster		=0/200	disease causing (ClinVar)

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs1553703619; hg19: chr3-69998210;