1-228211817-T-G

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_001386125.1(OBSCN):c.34T>G(p.Phe12Val) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. F12Y) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 33)
• Consequence: OBSCN NM_001386125.1 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 6.15

Genes affected

OBSCN (HGNC:15719): (obscurin, cytoskeletal calmodulin and titin-interacting RhoGEF) The obscurin gene spans more than 150 kb, contains over 80 exons and encodes a protein of approximately 720 kDa. The encoded protein contains 68 Ig domains, 2 fibronectin domains, 1 calcium/calmodulin-binding domain, 1 RhoGEF domain with an associated PH domain, and 2 serine-threonine kinase domains. This protein belongs to the family of giant sacromeric signaling proteins that includes titin and nebulin, and may have a role in the organization of myofibrils during assembly and may mediate interactions between the sarcoplasmic reticulum and myofibrils. Alternatively spliced transcript variants encoding different isoforms have been identified. [provided by RefSeq, Jul 2008]

OBSCN-AS1 (HGNC:32047): (OBSCN antisense RNA 1)

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.887

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
OBSCN	NM_001386125.1	c.34T>G	p.Phe12Val	missense_variant	2/116	ENST00000680850.1
OBSCN-AS1	NR_073155.1	n.234+1605A>C		intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
OBSCN	ENST00000680850.1	c.34T>G	p.Phe12Val	missense_variant	2/116		NM_001386125.1	P4
OBSCN-AS1	ENST00000295012.5	n.239+1605A>C		intron_variant, non_coding_transcript_variant		1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 72

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 06, 2022

The p.F12V variant (also known as c.34T>G), located in coding exon 1 of the OBSCN gene, results from a T to G substitution at nucleotide position 34. The phenylalanine at codon 12 is replaced by valine, an amino acid with highly similar properties. This amino acid position is conserved. In addition, this alteration is predicted to be tolerated by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
BayesDel_addAF	Uncertain	0.030	T
BayesDel_noAF	Benign	-0.19
Cadd	Uncertain	24
Dann	Benign	0.97
Eigen	Uncertain	0.55
Eigen_PC	Uncertain	0.46
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Uncertain	0.93	D;D;D;.;.
M_CAP	Uncertain	0.13	D
MetaRNN	Pathogenic	0.89	D;D;D;D;D
MetaSVM	Uncertain	0.022	D
MutationAssessor	Benign	1.6	L;L;.;.;L
MutationTaster	Benign	1.0	D;D;D;D;D
PrimateAI	Pathogenic	0.84	D
PROVEAN	Uncertain	-3.8	D;D;D;.;.
REVEL	Pathogenic	0.69
Sift	Benign	0.14	T;T;T;.;.
Sift4G	Pathogenic	0.0	D;D;D;D;.
Polyphen		1.0	D;D;.;.;D
Vest4		0.62
MutPred		0.76		Gain of MoRF binding (P = 0.0697);Gain of MoRF binding (P = 0.0697);Gain of MoRF binding (P = 0.0697);Gain of MoRF binding (P = 0.0697);Gain of MoRF binding (P = 0.0697);
MVP		0.80
MPC		2.4
ClinPred		0.99	D
GERP RS		4.8
Varity_R		0.82
gMVP		0.68

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

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr1-228399518;