3-138945701-G-GGCGC

Position:

• chr3-138945701-G-GGCGC

Variant summary

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

The NM_023067.4(FOXL2):​c.1021_1022insGCGC​(p.Pro341ArgfsTer194) variant causes a frameshift change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Likely pathogenic (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: FOXL2 NM_023067.4 frameshift
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 3.94

Genes affected

FOXL2 (HGNC:1092): (forkhead box L2) This gene encodes a forkhead transcription factor. The protein contains a fork-head DNA-binding domain and may play a role in ovarian development and function. Expansion of a polyalanine repeat region and other mutations in this gene are a cause of blepharophimosis syndrome and premature ovarian failure 3. [provided by RefSeq, Jul 2016]

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 0.0973 CDS is truncated, and there are 2 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 3-138945701-G-GGCGC is Pathogenic according to our data. Variant chr3-138945701-G-GGCGC is described in ClinVar as [Likely_pathogenic]. Clinvar id is 2709291.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
FOXL2	NM_023067.4	c.1021_1022insGCGC	p.Pro341ArgfsTer194	frameshift_variant	1/1	ENST00000648323.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
FOXL2	ENST00000648323.1	c.1021_1022insGCGC	p.Pro341ArgfsTer194	frameshift_variant	1/1		NM_023067.4	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 13, 2024

This sequence change results in a frameshift in the FOXL2 gene (p.Pro341Argfs*194). While this is not anticipated to result in nonsense mediated decay, it is expected to disrupt the last 36 amino acid(s) of the FOXL2 protein and extend the protein by 157 additional amino acid residues. This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with FOXL2-related conditions. This variant disrupts the C-terminus of the FOXL2 protein. Other variant(s) that disrupt this region (p.*377Leuext*156, p.Glu352Aspfs*4, p.Leu376Profs*154) have been observed in individuals with FOXL2-related conditions (PMID: 12529855, 18642388). This suggests that this may be a clinically significant region of the protein. 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

No publications associated with this variant yet.

Other links and lift over

hg19: chr3-138664543;