X-124371389-T-C

Variant names:

• chrX-124371389-T-C
• rs111033625
• NM_002351.5:c.385T>C

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PM2 PM4 PP5_Moderate

The NM_002351.5(SH2D1A):​c.385T>C​(p.Ter129Argext*?) variant causes a stop 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: 21)
  • Exomes 𝑓: 0.0 (0 hom. 0 hem.)
  • Failed GnomAD Quality Control
• Consequence: SH2D1A NM_002351.5 stop_lost
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 4.15
• Publications: 4 publications found

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]

STAG2 Gene-Disease associations (from GenCC):

• Mullegama-Klein-Martinez syndrome

  Inheritance: XL Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, G2P, Labcorp Genetics (formerly Invitae), Illumina
• Xq25 microduplication syndrome

  Inheritance: XL Classification: LIMITED Submitted by: Ambry Genetics

ACMG classification

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

• PM2: Very rare variant in population databases, with high coverage
• PM4: Stoplost variant in NM_002351.5 Downstream stopcodon found after 154 codons.
• PP5: Variant X-124371389-T-C is Pathogenic according to our data. Variant chrX-124371389-T-C is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 547773.Status of the report is criteria_provided_single_submitter, 1 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_002351.5. 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
	SH2D1A	NM_002351.5	MANE Select	c.385T>C	p.Ter129Argext*?	stop_lost	Exon 4 of 4	NP_002342.1
	SH2D1A	NM_001114937.3		c.376T>C	p.Ter126Argext*?	stop_lost	Exon 4 of 4	NP_001108409.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SH2D1A	ENST00000371139.9	TSL:1 MANE Select	c.385T>C	p.Ter129Argext*?	stop_lost	Exon 4 of 4	ENSP00000360181.5
	SH2D1A	ENST00000360027.5	TSL:1	c.376T>C	p.Ter126Argext*?	stop_lost	Exon 4 of 4	ENSP00000353126.4
	SH2D1A	ENST00000494073.5	TSL:1	c.*77T>C		3_prime_UTR	Exon 3 of 3	ENSP00000513589.1

Frequencies

GnomAD3 genomes Cov.: 21

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1035896 Hom.: 0 Cov.: 22 AF XY: 0.00 AC XY: 0 AN XY: 314244

African (AFR) AF: 0.00 AC: 0 AN: 25181

American (AMR) AF: 0.00 AC: 0 AN: 34821

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 18871

East Asian (EAS) AF: 0.00 AC: 0 AN: 29879

South Asian (SAS) AF: 0.00 AC: 0 AN: 51512

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 40318

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 3861

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 787464

Other (OTH) AF: 0.00 AC: 0 AN: 43989

GnomAD4 genome Cov.: 21

ClinVar

ClinVar submissions as Germline

Significance: Likely pathogenic

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
1	-	-	X-linked lymphoproliferative disease due to SH2D1A deficiency (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.19	D
BayesDel_noAF	Uncertain	0.030
CADD	Benign	18
DANN	Benign	0.87
FATHMM_MKL	Uncertain	0.92	D
PhyloP100		4.1
Vest4		0.22
GERP RS		5.3
Mutation Taster		=2/198	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: rs111033625; hg19: chrX-123505239;