chr2-219570311-A-AG

Variant names:

• chr2-219570311-A-AG
• NM_015311.3:c.921_922insC

Variant summary

Our verdict is Pathogenic. The variant received 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_015311.3(OBSL1):​c.921_922insC​(p.Tyr308LeufsTer47) 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 (★). Synonymous variant affecting the same amino acid position (i.e. L307L) has been classified as Benign. Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 35)
• Consequence: OBSL1 NM_015311.3 frameshift
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: -0.333
• Publications: 0 publications found

Genes affected

OBSL1 (HGNC:29092): (obscurin like cytoskeletal adaptor 1) Cytoskeletal adaptor proteins function in linking the internal cytoskeleton of cells to the cell membrane. This gene encodes a cytoskeletal adaptor protein, which is a member of the Unc-89/obscurin family. The protein contains multiple N- and C-terminal immunoglobulin (Ig)-like domains and a central fibronectin type 3 domain. Mutations in this gene cause 3M syndrome type 2. Alternatively spliced transcript variants encoding different isoforms have been found in this gene. [provided by RefSeq, Mar 2010]

INHA (HGNC:6065): (inhibin subunit alpha) This gene encodes a member of the TGF-beta (transforming growth factor-beta) superfamily of proteins. The encoded preproprotein is proteolytically processed to generate multiple peptide products, including the alpha subunit of the inhibin A and B protein complexes. These complexes negatively regulate follicle stimulating hormone secretion from the pituitary gland. Inhibins have also been implicated in regulating numerous cellular processes including cell proliferation, apoptosis, immune response and hormone secretion. Mutations in this gene may be associated with male infertility and premature ovarian failure in female human patients. [provided by RefSeq, Aug 2016]

ACMG classification

Our verdict: Pathogenic. The variant received 12 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 2-219570311-A-AG is Pathogenic according to our data. Variant chr2-219570311-A-AG is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 3585690.Status of the report is criteria_provided_single_submitter, 1 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_015311.3. 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
	OBSL1	NM_015311.3	MANE Select	c.921_922insC	p.Tyr308LeufsTer47	frameshift	Exon 1 of 21	NP_056126.1	O75147-3
	OBSL1	NM_001173431.2		c.921_922insC	p.Tyr308LeufsTer47	frameshift	Exon 1 of 14	NP_001166902.1	O75147-4
	OBSL1	NM_001173408.2		c.921_922insC	p.Tyr308LeufsTer47	frameshift	Exon 1 of 9	NP_001166879.1	O75147-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	OBSL1	ENST00000404537.6	TSL:1 MANE Select	c.921_922insC	p.Tyr308LeufsTer47	frameshift	Exon 1 of 21	ENSP00000385636.1	O75147-3
	OBSL1	ENST00000373873.8	TSL:1	c.921_922insC	p.Tyr308LeufsTer47	frameshift	Exon 1 of 9	ENSP00000362980.4	O75147-2
	OBSL1	ENST00000953546.1		c.921_922insC	p.Tyr308LeufsTer47	frameshift	Exon 1 of 21	ENSP00000623605.1

Frequencies

GnomAD3 genomes Cov.: 35

GnomAD4 exome Cov.: 64

GnomAD4 genome Cov.: 35

ClinVar

ClinVar submissions

Significance: Likely pathogenic

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
1	-	-	3M syndrome 2 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		-0.33

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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

hg19: chr2-220435033;