chr3-69120059-T-G

Variant names:

• chr3-69120059-T-G
• rs1258289949
• NM_198271.5:c.296A>C

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_198271.5(LMOD3):​c.296A>C​(p.Glu99Ala) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 17/24 in silico tools predict a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. E99G) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 31)
• Consequence: LMOD3 NM_198271.5 missense, splice_region
• Scores: Splicing: ADA: 0.0004695
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.10
• 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 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.0977146).

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

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	LMOD3	NM_198271.5	MANE Select	c.296A>C	p.Glu99Ala	missense splice_region	Exon 2 of 3	NP_938012.2
	LMOD3	NM_001304418.3		c.296A>C	p.Glu99Ala	missense splice_region	Exon 3 of 4	NP_001291347.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	LMOD3	ENST00000420581.7	TSL:1 MANE Select	c.296A>C	p.Glu99Ala	missense splice_region	Exon 2 of 3	ENSP00000414670.3
	LMOD3	ENST00000475434.1	TSL:5	c.296A>C	p.Glu99Ala	missense splice_region	Exon 3 of 4	ENSP00000418645.1
	LMOD3	ENST00000489031.5	TSL:2	c.296A>C	p.Glu99Ala	missense splice_region	Exon 3 of 4	ENSP00000417210.1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 31

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.10
BayesDel_addAF	Benign	-0.23	T
BayesDel_noAF	Benign	-0.56
CADD	Benign	16
DANN	Benign	0.96
DEOGEN2	Benign	0.0066	T
Eigen	Benign	-0.19
Eigen_PC	Benign	-0.12
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Benign	0.50	T
M_CAP	Benign	0.0061	T
MetaRNN	Benign	0.098	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Uncertain	2.5	M
PhyloP100		1.1
PrimateAI	Benign	0.28	T
PROVEAN	Benign	-1.6	N
REVEL	Benign	0.0080
Sift	Benign	0.041	D
Sift4G	Benign	0.22	T
Polyphen		0.38	B
Vest4		0.20
MutPred		0.39		Loss of helix (P = 0.0093)
MVP		0.45
MPC		0.030
ClinPred		0.28	T
GERP RS		3.0
Varity_R		0.072
gMVP		0.079
Mutation Taster		=88/12	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.00047
dbscSNV1_RF	Benign	0.042
SpliceAI score (max)		0.0		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: rs1258289949; hg19: chr3-69169210;