rs200818962

Variant names:

Variant summary

Our verdict is Pathogenic. The variant received 16 ACMG points: 16P and 0B. PVS1PP5_Very_Strong

The NM_006929.5(SKIC2):c.1120C>T(p.Arg374*) variant causes a stop gained change. The variant allele was found at a frequency of 0.0000242 in 1,614,048 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

Frequency

Genomes: 𝑓 0.00011 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000016 ( 0 hom. )

Consequence

SKIC2
NM_006929.5 stop_gained

Scores

Clinical Significance

Pathogenic criteria provided, multiple submitters, no conflicts P:4

Conservation

PhyloP100: 3.60

Publications

9 publications found

Variant links:

Genes affected

SKIC2 (HGNC:10898): (SKI2 subunit of superkiller complex) DEAD box proteins, characterized by the conserved motif Asp-Glu-Ala-Asp (DEAD), are putative RNA helicases. They are implicated in a number of cellular processes involving alteration of RNA secondary structure such as translation initiation, nuclear and mitochondrial splicing, and ribosome and spliceosome assembly. Based on their distribution patterns, some members of this family are believed to be involved in embryogenesis, spermatogenesis, and cellular growth and division. This gene encodes a DEAD box protein, which is a human homologue of yeast SKI2 and may be involved in antiviral activity by blocking translation of poly(A) deficient mRNAs. This gene is located in the class III region of the major histocompatibility complex. [provided by RefSeq, Jul 2008]

SKIC2 Gene-Disease associations (from GenCC):

trichohepatoenteric syndrome 2
Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), PanelApp Australia, G2P
trichohepatoenteric syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

SKIC2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Pathogenic. The variant received 16 ACMG points.

PVS1

Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.

PP5

Variant 6-31962494-C-T is Pathogenic according to our data. Variant chr6-31962494-C-T is described in ClinVar as Pathogenic. ClinVar VariationId is 235728.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein
SKIC2	NM_006929.5 link	c.1120C>T	p.Arg374*	stop_gained	Exon 11 of 28	ENST00000375394.7	NP_008860.4
SKIC2	XM_011514815.4 link	c.1120C>T	p.Arg374*	stop_gained	Exon 11 of 25		XP_011513117.1
SKIC2	XM_047419259.1 link	c.1120C>T	p.Arg374*	stop_gained	Exon 11 of 25		XP_047275215.1
SKIC2	XM_047419260.1 link	c.1120C>T	p.Arg374*	stop_gained	Exon 11 of 24		XP_047275216.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SKIC2	ENST00000375394.7 link	c.1120C>T	p.Arg374*	stop_gained	Exon 11 of 28	1	NM_006929.5	ENSP00000364543.2

Frequencies

GnomAD3 genomes

AF:

0.000105

AC:

AN:

152092

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000290

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000193

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000441

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000239

AC:

AN:

251408

AF XY:

0.0000294

show subpopulations

Gnomad AFR exome

AF:

0.000246

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000544

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000157

AC:

AN:

1461838

Hom.:

Cov.:

AF XY:

0.0000124

AC XY:

AN XY:

727222

show subpopulations

African (AFR)

AF:

0.000119

AC:

AN:

33480

American (AMR)

AF:

0.00

AC:

AN:

44722

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.0000252

AC:

AN:

39700

South Asian (SAS)

AF:

0.0000116

AC:

AN:

86252

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53406

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.0000153

AC:

AN:

1111980

Other (OTH)

AF:

0.00

AC:

AN:

60394

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000105

AC:

AN:

152210

Hom.:

Cov.:

AF XY:

0.0000806

AC XY:

AN XY:

74428

show subpopulations

African (AFR)

AF:

0.000289

AC:

AN:

41530

American (AMR)

AF:

0.00

AC:

AN:

15284

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.000193

AC:

AN:

5182

South Asian (SAS)

AF:

0.00

AC:

AN:

4816

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10604

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000441

AC:

AN:

68006

Other (OTH)

AF:

0.00

AC:

AN:

2112

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.519

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.000755

Hom.:

Bravo

AF:

0.0000869

ExAC

AF:

0.0000165

AC:

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Pathogenic:2

May 21, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change creates a premature translational stop signal (p.Arg374*) in the SKIV2L gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in SKIV2L are known to be pathogenic (PMID: 22444670). This variant is present in population databases (rs200818962, gnomAD 0.02%). This premature translational stop signal has been observed in individual(s) with trichohepatoenteric syndrome (PMID: 27431780). ClinVar contains an entry for this variant (Variation ID: 235728). For these reasons, this variant has been classified as Pathogenic. -

Apr 28, 2016

Center for Pediatric Genomic Medicine, Children's Mercy Hospital and Clinics

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Trichohepatoenteric syndrome 2

Pathogenic:1

Oct 10, 2022

OMIM

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:literature only

- -

SKIC2-related disorder

Pathogenic:1

Sep 20, 2024

PreventionGenetics, part of Exact Sciences

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:clinical testing

The SKIC2 c.1120C>T variant is predicted to result in premature protein termination (p.Arg374*). This gene has an alternate name SKIV2L. This variant has been reported in the homozygous state in an individual with fetal microcephaly (Wang et al. 2023. PubMed ID: 37229200). This variant has been reported in the compound heterozygous state in an individual with trichohepatoenteric syndrome (Zheng et al. 2016. PubMed ID: 27431780). This variant has also been reported with a second missense variant in the same gene in an individual with primary immunodeficiency (Table E1, Stray-Pedersen et al. 2017. PubMed ID: 27577878). This variant is reported in 0.024% of alleles in individuals of African descent in gnomAD. Nonsense variants in SKIC2 are expected to be pathogenic. This variant is interpreted as pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.42

BayesDel_noAF

Pathogenic

0.58

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

Eigen

Pathogenic

0.75

Eigen_PC

Uncertain

0.59

FATHMM_MKL

Uncertain

0.87

PhyloP100

3.6

Vest4

0.87

GERP RS

4.6

Mutation Taster

=5/195

disease causing (ClinVar)

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over