rs1060500722

Positions:

• chr16-15771586-CTGA-C

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PM4_Supporting

The NM_002474.3(MYH11):​c.1013_1015delTCA​(p.Phe338_Ser339delinsCys) variant causes a disruptive inframe deletion change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000274 in 1,461,848 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 29)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: MYH11 NM_002474.3 disruptive_inframe_deletion
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 9.32

Genes affected

MYH11 (HGNC:7569): (myosin heavy chain 11) The protein encoded by this gene is a smooth muscle myosin belonging to the myosin heavy chain family. The gene product is a subunit of a hexameric protein that consists of two heavy chain subunits and two pairs of non-identical light chain subunits. It functions as a major contractile protein, converting chemical energy into mechanical energy through the hydrolysis of ATP. A chromosomal rearrangement involving this gene is associated with acute myeloid leukemia of the M4Eo subtype. Mutations in this gene are associated with visceral myopathy, megacystis-microcolon-intestinal hypoperistalsis syndrome 2, and familial thoracic aortic aneurysm 4. [provided by RefSeq, May 2022]

MYH11 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM4: Nonframeshift variant in NON repetitive region in NM_002474.3. Strenght limited to Supporting due to length of the change: 1aa.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MYH11	NM_002474.3	c.1013_1015delTCA	p.Phe338_Ser339delinsCys	disruptive_inframe_deletion	9/41	ENST00000300036.6	NP_002465.1
MYH11	NM_001040113.2	c.1034_1036delTCA	p.Phe345_Ser346delinsCys	disruptive_inframe_deletion	10/43	ENST00000452625.7	NP_001035202.1
MYH11	NM_001040114.2	c.1034_1036delTCA	p.Phe345_Ser346delinsCys	disruptive_inframe_deletion	10/42		NP_001035203.1
MYH11	NM_022844.3	c.1013_1015delTCA	p.Phe338_Ser339delinsCys	disruptive_inframe_deletion	9/42		NP_074035.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MYH11	ENST00000300036.6	c.1013_1015delTCA	p.Phe338_Ser339delinsCys	disruptive_inframe_deletion	9/41	1	NM_002474.3	ENSP00000300036.5
MYH11	ENST00000452625.7	c.1034_1036delTCA	p.Phe345_Ser346delinsCys	disruptive_inframe_deletion	10/43	1	NM_001040113.2	ENSP00000407821.2

Frequencies

GnomAD3 genomes Cov.: 29

GnomAD3 exomes AF: 0.00000398 AC: 1 AN: 251480 Hom.: 0 AF XY: 0.00000736 AC XY: 1 AN XY: 135914

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 SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000879

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000274 AC: 4 AN: 1461848 Hom.: 0 AF XY: 0.00000550 AC XY: 4 AN XY: 727220

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000360

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 29

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Familial thoracic aortic aneurysm and aortic dissection Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Oct 25, 2024

The c.1013_1015delTCA variant (also known as p.F338_S339delinsC), located in coding exon 8 of the MYH11 gene, results from an in-frame deletion of TCA at nucleotide positions c.1013 to c.1015. The phenylalanine and serine residues at codons 338 and 339, respectively, are replaced by a cysteine. These amino acid positions are not well conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis (Choi Y et al. PLoS ONE. 2012; 7(10):e46688). Based on the available evidence, the clinical significance of this variant remains unclear. -

Aortic aneurysm, familial thoracic 4 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Oct 11, 2023

This variant, c.1034_1036del, results in the deletion of 2 amino acid residues and the insertion of a cysteine residue in the MYH11 protein (p.Phe345_Ser346delinsCys), but otherwise preserves the integrity of the reading frame. This variant is present in population databases (no rsID available, gnomAD 0.0009%). This variant has not been reported in the literature in individuals affected with MYH11-related conditions. ClinVar contains an entry for this variant (Variation ID: 405463). Experimental studies and prediction algorithms are not available or were not evaluated, and the functional significance of this variant is currently unknown. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

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

LitVar

Other links and lift over

dbSNP: rs1060500722; hg19: chr16-15865443;