2-190055926-T-C

Variant summary

Our verdict is Benign. Variant got -14 ACMG points: 0P and 14B. BP4_Strong BP6_Moderate BA1

The NM_005259.3(MSTN):c.*1332A>G variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0241 in 152,600 control chromosomes in the GnomAD database, including 155 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★).

• Frequency:
  • Genomes: 𝑓 0.024 (155 hom., cov: 32)
  • Exomes 𝑓: 0.0028 (0 hom.)
• Consequence: MSTN NM_005259.3 3_prime_UTR
• Clinical Significance: Benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 0.637

Genes affected

MSTN (HGNC:4223): (myostatin) This gene encodes a secreted ligand of the TGF-beta (transforming growth factor-beta) superfamily of proteins. Ligands of this family bind various TGF-beta receptors leading to recruitment and activation of SMAD family transcription factors that regulate gene expression. The encoded preproprotein is proteolytically processed to generate each subunit of the disulfide-linked homodimer. This protein negatively regulates skeletal muscle cell proliferation and differentiation. Mutations in this gene are associated with increased skeletal muscle mass in humans and other mammals. [provided by RefSeq, Jul 2016]

C2orf88 (HGNC:28191): (chromosome 2 open reading frame 88) Predicted to enable protein kinase A regulatory subunit binding activity. Predicted to be located in plasma membrane. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Benign. Variant got -14 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.8).
• BP6: Variant 2-190055926-T-C is Benign according to our data. Variant chr2-190055926-T-C is described in ClinVar as [Benign]. Clinvar id is 333218.Status of the report is criteria_provided_single_submitter, 1 stars.
• BA1: GnomAd4 highest subpopulation (EAS) allele frequency at 95% confidence interval = 0.164 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MSTN	NM_005259.3	c.*1332A>G		3_prime_UTR_variant	3/3	ENST00000260950.5
C2orf88	XM_047446008.1	c.-517-24028T>C		intron_variant
C2orf88	XM_047446009.1	c.-517-24028T>C		intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MSTN	ENST00000260950.5	c.*1332A>G		3_prime_UTR_variant	3/3	1	NM_005259.3	P1
C2orf88	ENST00000478197.1	n.220-23297T>C		intron_variant, non_coding_transcript_variant		4
C2orf88	ENST00000495546.1	n.202-24028T>C		intron_variant, non_coding_transcript_variant		4

Frequencies

GnomAD3 genomes AF: 0.0241 AC: 3670 AN: 152130 Hom.: 154 Cov.: 32

Gnomad AFR AF: 0.0429

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0467

Gnomad ASJ AF: 0.00836

Gnomad EAS AF: 0.173

Gnomad SAS AF: 0.00806

Gnomad FIN AF: 0.00141

Gnomad MID AF: 0.0222

Gnomad NFE AF: 0.00203

Gnomad OTH AF: 0.0249

GnomAD4 exome AF: 0.00282 AC: 1 AN: 354 Hom.: 0 Cov.: 0 AF XY: 0.00463 AC XY: 1 AN XY: 216

Gnomad4 FIN exome AF: 0.00286

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome AF: 0.0242 AC: 3680 AN: 152246 Hom.: 155 Cov.: 32 AF XY: 0.0241 AC XY: 1795 AN XY: 74446

Gnomad4 AFR AF: 0.0428

Gnomad4 AMR AF: 0.0473

Gnomad4 ASJ AF: 0.00836

Gnomad4 EAS AF: 0.174

Gnomad4 SAS AF: 0.00766

Gnomad4 FIN AF: 0.00141

Gnomad4 NFE AF: 0.00204

Gnomad4 OTH AF: 0.0242

Alfa AF: 0.0128 Hom.: 14

Bravo AF: 0.0331

Asia WGS AF: 0.0580 AC: 200 AN: 3446

ClinVar

Significance: Benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

Myostatin-related muscle hypertrophy Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.80
Cadd	Benign	3.4
Dann	Benign	0.72

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

Publications

LitVar

Other links and lift over

dbSNP: rs3791782; hg19: chr2-190920652;