chr1-2229115-G-C

Position:

• chr1-2229115-G-C

Variant summary

Our verdict is Pathogenic. Variant got 16 ACMG points: 16P and 0B. PM2 PM5 PP3_Strong PP5_Very_Strong

The NM_003036.4(SKI):​c.349G>C​(p.Gly117Arg) variant causes a missense 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 Likely pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G117S) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: SKI NM_003036.4 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:2
• Conservation: PhyloP100: 9.51

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]

ACMG classification

Verdict is Pathogenic. Variant got 16 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr1-2229115-G-A is described in Lovd as [Pathogenic].
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.984
• PP5: Variant 1-2229115-G-C is Pathogenic according to our data. Variant chr1-2229115-G-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 224868.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr1-2229115-G-C is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SKI	NM_003036.4	c.349G>C	p.Gly117Arg	missense_variant	1/7	ENST00000378536.5	NP_003027.1
SKI	XM_005244775.4	c.349G>C	p.Gly117Arg	missense_variant	1/7		XP_005244832.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SKI	ENST00000378536.5	c.349G>C	p.Gly117Arg	missense_variant	1/7	1	NM_003036.4	ENSP00000367797	P1
SKI	ENST00000704337.1	n.137+1591G>C		intron_variant, non_coding_transcript_variant

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

GeneDx

Jun 02, 2017

The G117R variant in the SKI gene has been reported in one individual with SGS, and was apparently de novo (Doyle et al., 2012). The G117R variant is not observed in large population cohorts (Lek et al., 2016; 1000 Genomes Consortium et al., 2015; Exome Variant Server). The G117R variant is a non-conservative amino acid substitution, which is likely to impact secondary protein structure as these residues differ in polarity, charge, size and/or other properties. This substitution occurs at a position that is conserved across species, and in silico analysis predicts this variant is probably damaging to the protein structure/function. Western blot studies using patient skin cells suggested changes to TGF-beta signaling and likely consistent with a deleterious effect on SKI, though transfection of the variant into an external model organism was not completed (Doyle et al., 2012). -

Shprintzen-Goldberg syndrome Pathogenic:1

Pathogenic, criteria provided, single submitter

research

Baylor-Hopkins Center for Mendelian Genomics, Johns Hopkins University School of Medicine

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.53	D
BayesDel_noAF	Pathogenic	0.53
CADD	Pathogenic	32
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.97	D
Eigen	Uncertain	0.67
Eigen_PC	Uncertain	0.54
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Uncertain	0.90	D
M_CAP	Pathogenic	0.71	D
MetaRNN	Pathogenic	0.98	D
MetaSVM	Pathogenic	0.90	D
MutationAssessor	Uncertain	2.7	M
MutationTaster	Benign	1.0	D
PrimateAI	Pathogenic	0.93	D
PROVEAN	Pathogenic	-6.5	D
REVEL	Pathogenic	0.88
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.98
MutPred		0.85		Gain of solvent accessibility (P = 0.0055);
MVP		1.0
MPC		3.0
ClinPred		1.0	D
GERP RS		2.3
RBP_binding_hub_radar		0.92
RBP_regulation_power_radar		4.9
Varity_R		0.94
gMVP		0.99

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: rs869312901; hg19: chr1-2160554;