2-1903189-A-C

Variant names:

• chr2-1903189-A-C
• rs869320676
• NM_001303052.2:c.1923T>G

Variant summary

Our verdict is Pathogenic. The variant received 11 ACMG points: 11P and 0B. PVS1 PM2 PP5

The NM_001303052.2(MYT1L):​c.1923T>G​(p.Tyr641*) variant causes a stop gained change involving the alteration of a non-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 (no stars). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 33)
• Consequence: MYT1L NM_001303052.2 stop_gained
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 2.17
• Publications: 0 publications found

Genes affected

MYT1L (HGNC:7623): (myelin transcription factor 1 like) This gene encodes a member of the zinc finger superfamily of transcription factors whose expression, thus far, has been found only in neuronal tissues. The encoded protein belongs to a novel class of cystein-cystein-histidine-cystein zinc finger proteins that function in the developing mammalian central nervous system. Forced expression of this gene in combination with the basic helix-loop-helix transcription factor NeuroD1 and the transcription factors POU class 3 homeobox 2 and achaete-scute family basic helix-loop-helix transcription factor 1 can convert fetal and postnatal human fibroblasts into induced neuronal cells, which are able to generate action potentials. Mutations in this gene have been associated with an autosomal dominant form of cognitive disability and with autism spectrum disorder. Alternative splicing results in multiple variants. [provided by RefSeq, Jul 2017]

MYT1L Gene-Disease associations (from GenCC):

• intellectual disability, autosomal dominant 39

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Genomics England PanelApp, Ambry Genetics, G2P, Labcorp Genetics (formerly Invitae)
• syndromic intellectual disability

  Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: Orphanet, ClinGen

ACMG classification

Our verdict: Pathogenic. The variant received 11 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 2-1903189-A-C is Pathogenic according to our data. Variant chr2-1903189-A-C is described in ClinVar as Pathogenic. ClinVar VariationId is 208429.Status of the report is no_assertion_criteria_provided, 0 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001303052.2. 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
	MYT1L	NM_001303052.2	MANE Select	c.1923T>G	p.Tyr641*	stop_gained	Exon 14 of 25	NP_001289981.1
	MYT1L	NM_001329844.2		c.1923T>G	p.Tyr641*	stop_gained	Exon 15 of 26	NP_001316773.1
	MYT1L	NM_001329845.1		c.1923T>G	p.Tyr641*	stop_gained	Exon 14 of 25	NP_001316774.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MYT1L	ENST00000647738.2	MANE Select	c.1923T>G	p.Tyr641*	stop_gained	Exon 14 of 25	ENSP00000497479.2
	MYT1L	ENST00000428368.7	TSL:1	c.1923T>G	p.Tyr641*	stop_gained	Exon 15 of 26	ENSP00000396103.3
	MYT1L	ENST00000399161.8	TSL:1	c.1917T>G	p.Tyr639*	stop_gained	Exon 14 of 25	ENSP00000382114.3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

ClinVar submissions as Germline

Significance: Pathogenic

Revision: no assertion criteria provided

Pathogenic	VUS	Benign	Condition
1	-	-	Intellectual disability, autosomal dominant 39 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.59
CADD	Pathogenic	35
DANN	Uncertain	0.99
Eigen	Uncertain	0.30
Eigen_PC	Benign	0.075
FATHMM_MKL	Uncertain	0.87	D
PhyloP100		2.2
GERP RS		-3.3
Mutation Taster		=3/197	disease causing (ClinVar)

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

Other links and lift over

dbSNP: rs869320676; hg19: chr2-1906961;