X-124346644-T-C

Position:

• chrX-124346644-T-C

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_002351.5(SH2D1A):​c.2T>C​(p.Met1?) variant causes a start lost 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 Likely pathogenic (★★).

• Frequency: Genomes: not found (cov: 23)
• Consequence: SH2D1A NM_002351.5 start_lost
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:3
• Conservation: PhyloP100: 6.14

Genes affected

SH2D1A (HGNC:10820): (SH2 domain containing 1A) This gene encodes a protein that plays a major role in the bidirectional stimulation of T and B cells. This protein contains an SH2 domain and a short tail. It associates with the signaling lymphocyte-activation molecule, thereby acting as an inhibitor of this transmembrane protein by blocking the recruitment of the SH2-domain-containing signal-transduction molecule SHP-2 to its docking site. This protein can also bind to other related surface molecules that are expressed on activated T, B and NK cells, thereby modifying signal transduction pathways in these cells. Mutations in this gene cause lymphoproliferative syndrome X-linked type 1 or Duncan disease, a rare immunodeficiency characterized by extreme susceptibility to infection with Epstein-Barr virus, with symptoms including severe mononucleosis and malignant lymphoma. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

STAG2 (HGNC:11355): (STAG2 cohesin complex component) The protein encoded by this gene is a subunit of the cohesin complex, which regulates the separation of sister chromatids during cell division. Targeted inactivation of this gene results in chromatid cohesion defects and aneuploidy, suggesting that genetic disruption of cohesin is a cause of aneuploidy in human cancer. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Sep 2013]

ACMG classification

Verdict is Pathogenic. Variant got 18 ACMG points.

• PVS1: Start lost variant, no new inframe start found.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant X-124346644-T-C is Pathogenic according to our data. Variant chrX-124346644-T-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 1455661.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SH2D1A	NM_002351.5	c.2T>C	p.Met1?	start_lost	1/4	ENST00000371139.9	NP_002342.1
SH2D1A	NM_001114937.3	c.2T>C	p.Met1?	start_lost	1/4		NP_001108409.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SH2D1A	ENST00000371139.9	c.2T>C	p.Met1?	start_lost	1/4	1	NM_002351.5	ENSP00000360181.5

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 23

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

X-linked lymphoproliferative disease due to SH2D1A deficiency Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Greenwood Genetic Center Diagnostic Laboratories, Greenwood Genetic Center	Jun 21, 2022	PVS1, PS4_Moderate, PM2 -
Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Aug 10, 2022	For these reasons, this variant has been classified as Pathogenic. ClinVar contains an entry for this variant (Variation ID: 1455661). Disruption of the initiator codon has been observed in individuals with X-linked lymphoproliferative syndrome (PMID: 22970278, 31415280). This variant is not present in population databases (gnomAD no frequency). This sequence change affects the initiator methionine of the SH2D1A mRNA. There are no downstream in-frame methionine residues; therefore, it is expected to result in an absent or disrupted protein product. Loss-of-function variants in SH2D1A are known to be pathogenic (PMID: 9771704, 11049992, 15711562). -

Autoinflammatory syndrome Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Genome Diagnostics Laboratory, The Hospital for Sick Children

Mar 01, 2017

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.74	D
BayesDel_noAF	Pathogenic	0.56
CADD	Benign	21
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.79	D;.;.
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Uncertain	0.90	D;D;D
M_CAP	Pathogenic	0.98	D
MetaRNN	Pathogenic	0.99	D;D;D
MetaSVM	Uncertain	0.77	D
PROVEAN	Pathogenic	-4.6	D;D;.
REVEL	Pathogenic	0.85
Sift	Pathogenic	0.0	D;D;.
Sift4G	Uncertain	0.0050	D;D;D
Polyphen		0.99	D;D;.
Vest4		0.83
MutPred		0.98		Loss of stability (P = 0.0086);Loss of stability (P = 0.0086);Loss of stability (P = 0.0086);
MVP		0.94
ClinPred		1.0	D
GERP RS		5.5
Varity_R		0.93
gMVP		0.94

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

No publications associated with this variant yet.

Other links and lift over

hg19: chrX-123480494;