NM_198271.5:c.203A>G

Variant names:

• chr3-69122184-T-C
• rs752432695
• NM_198271.5:c.203A>G

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_198271.5(LMOD3):​c.203A>G​(p.His68Arg) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: LMOD3 NM_198271.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 6.27
• Publications: 0 publications found

Genes affected

LMOD3 (HGNC:6649): (leiomodin 3) The protein encoded by this gene is a member of the leiomodin family of proteins. This protein contains three actin-binding domains, a tropomyosin domain, a leucine-rich repeat domain, and a Wiskott-Aldrich syndrome protein homology 2 domain (WH2). Localization of this protein to the pointed ends of thin filaments has been observed, and there is evidence that this protein acts as a catalyst of actin nucleation, and is important to the organization of sarcomeric thin filaments in skeletal muscles. Mutations in this gene have been associated as one cause of Nemaline myopathy, as other genes have also been linked to this disorder. Nemaline myopathy is a disorder characterized by nonprogressive generalized muscle weakness and protein inclusions (nemaline bodies) in skeletal myofibers. Patients with mutations in this gene often present with a severe congenital form of the disorder. [provided by RefSeq, Jan 2015]

LMOD3 Gene-Disease associations (from GenCC):

• nemaline myopathy 10

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), ClinGen, G2P
• typical nemaline myopathy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• severe congenital nemaline myopathy

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_198271.5. 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
	LMOD3	NM_198271.5	MANE Select	c.203A>G	p.His68Arg	missense	Exon 1 of 3	NP_938012.2	Q0VAK6-1
	LMOD3	NM_001304418.3		c.203A>G	p.His68Arg	missense	Exon 2 of 4	NP_001291347.1	Q0VAK6-1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	LMOD3	ENST00000420581.7	TSL:1 MANE Select	c.203A>G	p.His68Arg	missense	Exon 1 of 3	ENSP00000414670.3	Q0VAK6-1
	LMOD3	ENST00000475434.1	TSL:5	c.203A>G	p.His68Arg	missense	Exon 2 of 4	ENSP00000418645.1	Q0VAK6-1
	LMOD3	ENST00000489031.5	TSL:2	c.203A>G	p.His68Arg	missense	Exon 2 of 4	ENSP00000417210.1	Q0VAK6-1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.00000404 AC: 1 AN: 247760 AF XY: 0.00000744

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000890

Gnomad OTH exome AF: 0.00

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ExAC AF: 0.00000828 AC: 1

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	Nemaline myopathy 10 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.61
BayesDel_addAF	Benign	-0.12	T
BayesDel_noAF	Benign	-0.41
CADD	Uncertain	23
DANN	Benign	0.93
DEOGEN2	Benign	0.0080	T
Eigen	Uncertain	0.27
Eigen_PC	Uncertain	0.36
FATHMM_MKL	Uncertain	0.81	D
LIST_S2	Benign	0.78	T
M_CAP	Benign	0.017	T
MetaRNN	Uncertain	0.46	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	0.99	L
PhyloP100		6.3
PrimateAI	Uncertain	0.69	T
PROVEAN	Benign	0.15	N
REVEL	Benign	0.19
Sift	Benign	0.69	T
Sift4G	Benign	1.0	T
Polyphen		0.98	D
Vest4		0.56
MutPred		0.35		Gain of MoRF binding (P = 0.0243)
MVP		0.29
MPC		0.18
ClinPred		0.83	D
GERP RS		5.7
PromoterAI		0.11	Neutral
Varity_R		0.27
gMVP		0.22
Mutation Taster		=73/27	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.070		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

dbSNP: rs752432695; hg19: chr3-69171335;