rs797045021

Variant names:

• chrX-123631770-A-G
• rs797045021
• NM_001081550.2:c.2399T>C

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PM2 PP2 PP3_Moderate PP5

The NM_001081550.2(THOC2):​c.2399T>C​(p.Ile800Thr) 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 Pathogenic (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. I800V) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 23)
• Consequence: THOC2 NM_001081550.2 missense
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 9.31
• Publications: 5 publications found

Genes affected

THOC2 (HGNC:19073): (THO complex subunit 2) The TREX multiprotein complex binds specifically to spliced mRNAs to facilitate mRNA export. The protein encoded by this gene is a member of the THO complex, a subset of the TREX complex. The encoded protein interacts with the THOC1 protein.[provided by RefSeq, Jun 2010]

THOC2 Gene-Disease associations (from GenCC):

• X-linked intellectual disability-short stature-overweight syndrome

  Inheritance: XL Classification: STRONG, MODERATE, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), G2P, PanelApp Australia, Orphanet, Ambry Genetics

ACMG classification

Our verdict: Likely_pathogenic. The variant received 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 15 curated pathogenic missense variants (we use a threshold of 10). The gene has 3 curated benign missense variants. Gene score misZ: 5.5258 (above the threshold of 3.09). Trascript score misZ: NaN (below the threshold of 3.09). GenCC associations: The gene is linked to X-linked intellectual disability-short stature-overweight syndrome.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.843
• PP5: Variant X-123631770-A-G is Pathogenic according to our data. Variant chrX-123631770-A-G is described in ClinVar as Pathogenic. ClinVar VariationId is 208526.Status of the report is no_assertion_criteria_provided, 0 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001081550.2. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	THOC2	NM_001081550.2	MANE Select	c.2399T>C	p.Ile800Thr	missense	Exon 22 of 39	NP_001075019.1	Q8NI27-1
	THOC2	NM_001441235.1		c.2399T>C	p.Ile800Thr	missense	Exon 22 of 39	NP_001428164.1
	THOC2	NM_001441236.1		c.2399T>C	p.Ile800Thr	missense	Exon 22 of 39	NP_001428165.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	THOC2	ENST00000245838.13	TSL:5 MANE Select	c.2399T>C	p.Ile800Thr	missense	Exon 22 of 39	ENSP00000245838.8	Q8NI27-1
	THOC2	ENST00000355725.8	TSL:5	c.2399T>C	p.Ile800Thr	missense	Exon 22 of 39	ENSP00000347959.4	Q8NI27-1
	THOC2	ENST00000491737.5	TSL:5	c.2054T>C	p.Ile685Thr	missense	Exon 18 of 34	ENSP00000419795.1	A0A0C4DG98

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 23

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: no assertion criteria provided

Pathogenic	VUS	Benign	Condition
1	-	-	X-linked intellectual disability-short stature-overweight syndrome (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.84
BayesDel_addAF	Pathogenic	0.52	D
BayesDel_noAF	Pathogenic	0.51
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Benign	0.35	T
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.98	D
M_CAP	Uncertain	0.12	D
MetaRNN	Pathogenic	0.84	D
MetaSVM	Benign	-0.30	T
MutationAssessor	Uncertain	2.4	M
PhyloP100		9.3
PrimateAI	Pathogenic	0.91	D
PROVEAN	Uncertain	-4.0	D
REVEL	Uncertain	0.63
Sift	Uncertain	0.0010	D
Sift4G	Uncertain	0.0030	D
Polyphen		0.61	P
Vest4		0.91
MutPred		0.67		Loss of stability (P = 0.0037)
MVP		0.92
MPC		2.3
ClinPred		0.99	D
GERP RS		6.0
Varity_R		0.73
gMVP		0.81
Mutation Taster		=17/83	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: rs797045021; hg19: chrX-122765621;