X-131274768-T-TA

Variant names:

• chrX-131274768-T-TA
• rs398122921
• NM_001555.5:c.3581dupT

Variant summary

Our verdict is Pathogenic. The variant received 11 ACMG points: 11P and 0B. PVS1 PM2 PP5

The NM_001555.5(IGSF1):​c.3581dupT​(p.Glu1195ArgfsTer3) variant causes a frameshift change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (no stars). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 22)
• Consequence: IGSF1 NM_001555.5 frameshift
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 4.74
• Publications: 2 publications found

Genes affected

IGSF1 (HGNC:5948): (immunoglobulin superfamily member 1) This gene encodes a member of the immunoglobulin-like domain-containing superfamily. Proteins in this superfamily contain varying numbers of immunoglobulin-like domains and are thought to participate in the regulation of interactions between cells. Multiple transcript variants encoding different isoforms have been found for this gene.[provided by RefSeq, Jan 2010]

IGSF1 Gene-Disease associations (from GenCC):

• X-linked central congenital hypothyroidism with late-onset testicular enlargement

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

ENSG00000287806 (HGNC:):

ACMG classification

Our verdict: Pathogenic. The variant received 11 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant X-131274768-T-TA is Pathogenic according to our data. Variant chrX-131274768-T-TA is described in ClinVar as Pathogenic. ClinVar VariationId is 39853.Status of the report is no_assertion_criteria_provided, 0 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001555.5. 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
	IGSF1	NM_001555.5	MANE Select	c.3581dupT	p.Glu1195ArgfsTer3	frameshift	Exon 18 of 20	NP_001546.2
	IGSF1	NM_001170961.2		c.3596dupT	p.Glu1200ArgfsTer3	frameshift	Exon 18 of 20	NP_001164432.1	Q8N6C5-4
	IGSF1	NM_001438811.1		c.3596dupT	p.Glu1200ArgfsTer3	frameshift	Exon 19 of 21	NP_001425740.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	IGSF1	ENST00000361420.8	TSL:1 MANE Select	c.3581dupT	p.Glu1195ArgfsTer3	frameshift	Exon 18 of 20	ENSP00000355010.3	Q8N6C5-1
	IGSF1	ENST00000370903.8	TSL:1	c.3596dupT	p.Glu1200ArgfsTer3	frameshift	Exon 18 of 20	ENSP00000359940.3	Q8N6C5-4
	IGSF1	ENST00000370910.5	TSL:1	c.3554dupT	p.Glu1186ArgfsTer3	frameshift	Exon 17 of 19	ENSP00000359947.1	Q8N6C5-2

Frequencies

GnomAD3 genomes Cov.: 22

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 22

ClinVar

ClinVar submissions as Germline

Significance: Pathogenic

Revision: no assertion criteria provided

Pathogenic	VUS	Benign	Condition
1	-	-	X-linked central congenital hypothyroidism with late-onset testicular enlargement (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		4.7
Mutation Taster		=0/200	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.21		Details are displayed if max score is > 0.2
DS_AG_spliceai		0.21		Position offset: -2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs398122921; hg19: chrX-130408742;