NM_198271.5:c.759T>C

Variant names:

• chr3-69119596-A-G
• rs115972674
• NM_198271.5:c.759T>C

Variant summary

Our verdict is Benign. The variant received -21 ACMG points: 0P and 21B. BP4_Strong BP6_Very_Strong BP7 BS1 BS2

The NM_198271.5(LMOD3):​c.759T>C​(p.Pro253Pro) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0394 in 1,613,726 control chromosomes in the GnomAD database, including 1,477 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

• Frequency:
  • Genomes: 𝑓 0.029 (92 hom., cov: 31)
  • Exomes 𝑓: 0.040 (1385 hom.)
• Consequence: LMOD3 NM_198271.5 synonymous
• Clinical Significance: Benign criteria provided, multiple submitters, no conflicts B:3
• Conservation: PhyloP100: -0.334
• Publications: 7 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: Benign. The variant received -21 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.73).
• BP6: Variant 3-69119596-A-G is Benign according to our data. Variant chr3-69119596-A-G is described in ClinVar as Benign. ClinVar VariationId is 475332.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BP7: Synonymous conserved (PhyloP=-0.334 with no splicing effect.
• BS1: Variant frequency is greater than expected in population nfe. GnomAd4 allele frequency = 0.0291 (4436/152274) while in subpopulation NFE AF = 0.0473 (3214/68016). AF 95% confidence interval is 0.0459. There are 92 homozygotes in GnomAd4. There are 2071 alleles in the male GnomAd4 subpopulation. Median coverage is 31. This position passed quality control check.
• BS2: High Homozygotes in GnomAd4 at 92 AR,AD gene

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.759T>C	p.Pro253Pro	synonymous	Exon 2 of 3	NP_938012.2
	LMOD3	NM_001304418.3		c.759T>C	p.Pro253Pro	synonymous	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.759T>C	p.Pro253Pro	synonymous	Exon 2 of 3	ENSP00000414670.3
	LMOD3	ENST00000475434.1	TSL:5	c.759T>C	p.Pro253Pro	synonymous	Exon 3 of 4	ENSP00000418645.1
	LMOD3	ENST00000489031.5	TSL:2	c.759T>C	p.Pro253Pro	synonymous	Exon 3 of 4	ENSP00000417210.1

Frequencies

GnomAD3 genomes AF: 0.0292 AC: 4438 AN: 152156 Hom.: 92 Cov.: 31

Gnomad AFR AF: 0.00688

Gnomad AMI AF: 0.0592

Gnomad AMR AF: 0.0261

Gnomad ASJ AF: 0.0380

Gnomad EAS AF: 0.000385

Gnomad SAS AF: 0.0141

Gnomad FIN AF: 0.0195

Gnomad MID AF: 0.0475

Gnomad NFE AF: 0.0473

Gnomad OTH AF: 0.0296

GnomAD2 exomes AF: 0.0307 AC: 7646 AN: 248964 AF XY: 0.0315

Gnomad AFR exome AF: 0.00659

Gnomad AMR exome AF: 0.0184

Gnomad ASJ exome AF: 0.0355

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.0232

Gnomad NFE exome AF: 0.0481

Gnomad OTH exome AF: 0.0311

GnomAD4 exome AF: 0.0404 AC: 59067 AN: 1461452 Hom.: 1385 Cov.: 33 AF XY: 0.0400 AC XY: 29052 AN XY: 727004

African (AFR) AF: 0.00705 AC: 236 AN: 33480

American (AMR) AF: 0.0200 AC: 895 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.0365 AC: 953 AN: 26136

East Asian (EAS) AF: 0.000101 AC: 4 AN: 39698

South Asian (SAS) AF: 0.0150 AC: 1297 AN: 86254

European-Finnish (FIN) AF: 0.0213 AC: 1132 AN: 53186

Middle Eastern (MID) AF: 0.0329 AC: 190 AN: 5768

European-Non Finnish (NFE) AF: 0.0470 AC: 52252 AN: 1111832

Other (OTH) AF: 0.0349 AC: 2108 AN: 60374

GnomAD4 genome AF: 0.0291 AC: 4436 AN: 152274 Hom.: 92 Cov.: 31 AF XY: 0.0278 AC XY: 2071 AN XY: 74470

African (AFR) AF: 0.00686 AC: 285 AN: 41574

American (AMR) AF: 0.0261 AC: 399 AN: 15276

Ashkenazi Jewish (ASJ) AF: 0.0380 AC: 132 AN: 3470

East Asian (EAS) AF: 0.000386 AC: 2 AN: 5186

South Asian (SAS) AF: 0.0139 AC: 67 AN: 4818

European-Finnish (FIN) AF: 0.0195 AC: 207 AN: 10614

Middle Eastern (MID) AF: 0.0476 AC: 14 AN: 294

European-Non Finnish (NFE) AF: 0.0473 AC: 3214 AN: 68016

Other (OTH) AF: 0.0293 AC: 62 AN: 2114

Alfa AF: 0.0402 Hom.: 54

Bravo AF: 0.0296

Asia WGS AF: 0.00549 AC: 19 AN: 3478

EpiCase AF: 0.0488

EpiControl AF: 0.0525

ClinVar

Significance: Benign

Submissions summary: Benign:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:2

Jul 23, 2019

GeneDx

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Breakthrough Genomics, Breakthrough Genomics

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: not provided

Nemaline myopathy 10 Benign:1

Feb 03, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.73
CADD	Benign	1.1
DANN	Benign	0.62
PhyloP100		-0.33
Mutation Taster		=100/0	polymorphism (auto)

Splicing

Name	Calibrated prediction	Score	Prediction
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: rs115972674; hg19: chr3-69168747; COSMIC: COSV70455658;