1-2229305-C-T

Variant names:

• chr1-2229305-C-T
• rs863223722
• NM_003036.4:c.539C>T

Variant summary

Our verdict is Likely pathogenic. The variant received 7 ACMG points: 7P and 0B. PM2 PM5 PP3_Moderate PP5

The NM_003036.4(SKI):​c.539C>T​(p.Thr180Met) variant causes a missense change. 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 Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. T180K) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: SKI NM_003036.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:3 U:1
• Conservation: PhyloP100: 5.83
• Publications: 1 publications found

Genes affected

SKI (HGNC:10896): (SKI proto-oncogene) This gene encodes the nuclear protooncogene protein homolog of avian sarcoma viral (v-ski) oncogene. It functions as a repressor of TGF-beta signaling, and may play a role in neural tube development and muscle differentiation. [provided by RefSeq, Oct 2009]

SKI Gene-Disease associations (from GenCC):

• Shprintzen-Goldberg syndrome

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Ambry Genetics, PanelApp Australia, G2P, Genomics England PanelApp, ClinGen, Orphanet, Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Likely_pathogenic. The variant received 7 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr1-2229305-C-A is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 495053.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.919
• PP5: Variant 1-2229305-C-T is Pathogenic according to our data. Variant chr1-2229305-C-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 213684.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SKI	NM_003036.4	c.539C>T	p.Thr180Met	missense_variant	Exon 1 of 7	ENST00000378536.5	NP_003027.1
SKI	XM_005244775.4	c.539C>T	p.Thr180Met	missense_variant	Exon 1 of 7		XP_005244832.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SKI	ENST00000378536.5	c.539C>T	p.Thr180Met	missense_variant	Exon 1 of 7	1	NM_003036.4	ENSP00000367797.4
SKI	ENST00000704337.1	n.137+1781C>T		intron_variant	Intron 1 of 3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:3 Uncertain:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Shprintzen-Goldberg syndrome Pathogenic:2

Jul 21, 2017

Equipe Genetique des Anomalies du Developpement, Université de Bourgogne

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Mar 18, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces threonine, which is neutral and polar, with methionine, which is neutral and non-polar, at codon 180 of the SKI protein (p.Thr180Met). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with clinical features of Shprintzen-Goldberg syndrome (PMID: 31980905). In at least one individual the variant was observed to be de novo. ClinVar contains an entry for this variant (Variation ID: 213684). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt SKI protein function. For these reasons, this variant has been classified as Pathogenic. -

not provided Pathogenic:1

Jul 24, 2023

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Not observed in large population cohorts (gnomAD); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 31980905) -

Inborn genetic diseases Uncertain:1

Nov 19, 2019

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.30	D
BayesDel_noAF	Pathogenic	0.19
CADD	Pathogenic	28
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.97	D
Eigen	Uncertain	0.66
Eigen_PC	Uncertain	0.58
FATHMM_MKL	Uncertain	0.84	D
LIST_S2	Pathogenic	0.99	D
M_CAP	Pathogenic	0.35	D
MetaRNN	Pathogenic	0.92	D
MetaSVM	Uncertain	0.61	D
MutationAssessor	Uncertain	2.4	M
PhyloP100		5.8
PrimateAI	Pathogenic	0.95	D
PROVEAN	Pathogenic	-5.3	D
REVEL	Pathogenic	0.87
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.81
MutPred		0.54		Loss of ubiquitination at K179 (P = 0.1355);
MVP		0.95
MPC		2.8
ClinPred		1.0	D
GERP RS		4.1
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.92
gMVP		0.90
Mutation Taster		=12/88	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: rs863223722; hg19: chr1-2160744;