Genetic Variant OBSL1:p.Trp1206* (chr2-219557995-C-T) – ACMG Classification: Pathogenic (10 pts)

Variant summary

Our verdict is Pathogenic. The variant received 10 ACMG points: 10P and 0B. PVS1PM2

The NM_015311.3(OBSL1):c.3618G>A(p.Trp1206*) variant causes a stop gained change. The variant allele was found at a frequency of 0.000000685 in 1,459,686 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Variant results in nonsense mediated mRNA decay.

Frequency

Genomes: not found (cov: 34)

Exomes 𝑓: 6.9e-7 ( 0 hom. )

Consequence

OBSL1
NM_015311.3 stop_gained

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 5.69

Publications

0 publications found

Variant links:

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]

OBSL1 Gene-Disease associations (from GenCC):

3M syndrome 2
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, G2P
3-M syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

OBSL1 links:

ENSG00000269068 (HGNC:):

ENSG00000269068 links:

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new If you want to explore the variant's impact on the transcript NM_015311.3, check out the Mutation Effect Viewer. This is especially useful for frameshift variants or if you want to visualize the effect of exon loss / intron retention.

ACMG classification

Classification was made for transcript

Our verdict: Pathogenic. The variant received 10 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;

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.3618G>A	p.Trp1206*	stop_gained	Exon 11 of 21	NP_056126.1	O75147-3
	OBSL1	NM_001173431.2		c.3618G>A	p.Trp1206*	stop_gained	Exon 11 of 14	NP_001166902.1	O75147-4

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
OBSL1	ENST00000404537.6	TSL:1 MANE Select	c.3618G>A	p.Trp1206*	stop_gained	Exon 11 of 21	ENSP00000385636.1	O75147-3
OBSL1	ENST00000953546.1		c.3630G>A	p.Trp1210*	stop_gained	Exon 11 of 21	ENSP00000623605.1
OBSL1	ENST00000953548.1		c.3561G>A	p.Trp1187*	stop_gained	Exon 11 of 21	ENSP00000623607.1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.85e-7

AC:

AN:

1459686

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

726114

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33458

American (AMR)

AF:

0.00

AC:

AN:

44458

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26086

East Asian (EAS)

AF:

0.0000252

AC:

AN:

39666

South Asian (SAS)

AF:

0.00

AC:

AN:

86126

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52384

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1111430

Other (OTH)

AF:

0.00

AC:

AN:

60310

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.58

BayesDel_noAF

Pathogenic

0.51

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

Eigen

Uncertain

0.56

Eigen_PC

Uncertain

0.37

FATHMM_MKL

Uncertain

0.85

PhyloP100

5.7

Mutation Taster

=4/196

disease causing (fs/PTC)

(source)

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over