2-44942489-G-T

Variant names:

• chr2-44942489-G-T
• rs387906867
• NM_005413.4:c.385G>T

Variant summary

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

The NM_005413.4(SIX3):​c.385G>T​(p.Glu129*) 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 (no stars). Synonymous variant affecting the same amino acid position (i.e. E129E) has been classified as Likely benign. Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: SIX3 NM_005413.4 stop_gained
• Clinical Significance: Pathogenic no assertion criteria provided P:2
• Conservation: PhyloP100: 9.66
• Publications: 3 publications found

Genes affected

SIX3 (HGNC:10889): (SIX homeobox 3) This gene encodes a member of the sine oculis homeobox transcription factor family. The encoded protein plays a role in eye development. Mutations in this gene have been associated with holoprosencephaly type 2. [provided by RefSeq, Oct 2009]

ENSG00000225156 (HGNC:):

SIX3-AS1 (HGNC:40532): (SIX3 antisense RNA 1)

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 2-44942489-G-T is Pathogenic according to our data. Variant chr2-44942489-G-T is described in ClinVar as Pathogenic. ClinVar VariationId is 30380.Status of the report is no_assertion_criteria_provided, 0 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SIX3	NM_005413.4	c.385G>T	p.Glu129*	stop_gained	Exon 1 of 2	ENST00000260653.5	NP_005404.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SIX3	ENST00000260653.5	c.385G>T	p.Glu129*	stop_gained	Exon 1 of 2	1	NM_005413.4	ENSP00000260653.3
ENSG00000225156	ENST00000760330.1	n.135+8113G>T		intron_variant	Intron 1 of 1
SIX3-AS1	ENST00000760560.1	n.389-1656C>A		intron_variant	Intron 1 of 1
SIX3-AS1	ENST00000760561.1	n.366-1656C>A		intron_variant	Intron 1 of 1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: no assertion criteria provided

Submissions by phenotype

Holoprosencephaly 2 Pathogenic:1

Mar 01, 2010

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Schizencephaly Pathogenic:1

Mar 01, 2010

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.58	D
BayesDel_noAF	Pathogenic	0.54
CADD	Pathogenic	52
DANN	Uncertain	1.0
Eigen	Pathogenic	0.89
Eigen_PC	Uncertain	0.64
FATHMM_MKL	Pathogenic	0.99	D
PhyloP100		9.7
Vest4		0.90
GERP RS		3.0
Mutation Taster		=0/200	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: rs387906867; hg19: chr2-45169628;