X-49251358-ACA-G

Position:

• chrX-49251358-ACA-G

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PVS1_Moderate PM2 PP5_Moderate

The NM_014009.4(FOXP3):​c.1270_1272delinsC​(p.Cys424LeufsTer34) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Likely pathogenic (★).

• Frequency: Genomes: not found (cov: 22)
• Consequence: FOXP3 NM_014009.4 frameshift
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 1.85

Genes affected

FOXP3 (HGNC:6106): (forkhead box P3) The protein encoded by this gene is a member of the forkhead/winged-helix family of transcriptional regulators. Defects in this gene are the cause of immunodeficiency polyendocrinopathy, enteropathy, X-linked syndrome (IPEX), also known as X-linked autoimmunity-immunodeficiency syndrome. Alternatively spliced transcript variants encoding different isoforms have been identified. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most exon, not predicted to undergo nonsense mediated mRNA decay. Fraction of 0.0201 CDS is truncated, and there are 3 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant X-49251358-ACA-G is Pathogenic according to our data. Variant chrX-49251358-ACA-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 569686.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
FOXP3	NM_014009.4	c.1270_1272delinsC	p.Cys424LeufsTer34	frameshift_variant	12/12	ENST00000376207.10
FOXP3	NM_001114377.2	c.1165_1167delinsC	p.Cys389LeufsTer34	frameshift_variant	11/11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
FOXP3	ENST00000376207.10	c.1270_1272delinsC	p.Cys424LeufsTer34	frameshift_variant	12/12	1	NM_014009.4	P1

Frequencies

GnomAD3 genomes Cov.: 22

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 22

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Insulin-dependent diabetes mellitus secretory diarrhea syndrome Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Apr 25, 2018

This sequence change results in a frameshift in the FOXP3 gene (p.Cys424Phefs*34) which disrupts the translational stop signal of the FOXP3 mRNA. It is expected to extend the length of the FOXP3 protein by 25 additional amino acid residues. This variant is not present in population databases (ExAC no frequency). This variant has not been reported in the literature in individuals with FOXP3-related disease. Other frameshift variants c.1293_1294delCT (p.*432Thrext*25) and c.1290_*12delinsTG (p.Pro431delins21) that lie downstream of this variant and result in a similarly extended protein product have been reported in individuals affected with IPEX syndrome (PMID: 11137993, 11137992). These variants are also known as 1481_1482delCT and del1290-1309/insTGG in the literature. In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Splicing

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

Publications

LitVar

Other links and lift over

dbSNP: rs1569529565; hg19: chrX-49107819;