5-137870652-A-T

Variant names:

• chr5-137870652-A-T
• rs1561657261
• NM_006790.3:c.1A>T

Variant summary

Our verdict is Pathogenic. Variant got 10 ACMG points: 10P and 0B. PVS1 PM2

The NM_006790.3(MYOT):​c.1A>T​(p.Met1?) variant causes a initiator codon change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: MYOT NM_006790.3 initiator_codon
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.82

Genes affected

MYOT (HGNC:12399): (myotilin) This gene encodes a cystoskeletal protein which plays a significant role in the stability of thin filaments during muscle contraction. This protein binds F-actin, crosslinks actin filaments, and prevents latrunculin A-induced filament disassembly. Mutations in this gene have been associated with limb-girdle muscular dystrophy and myofibrillar myopathies. Several alternatively spliced transcript variants of this gene have been described, but the full-length nature of some of these variants has not been determined.[provided by RefSeq, Oct 2008]

PKD2L2-DT (HGNC:55557): (PKD2L2 divergent transcript)

ACMG classification

Verdict is Pathogenic. Variant got 10 ACMG points.

• PVS1: Start lost variant, next in-frame start position is after 20 pathogenic variants. Next in-frame start position is after 64 codons. Genomic position: 137870841. Lost 0.127 part of the original CDS.
• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MYOT	NM_006790.3	c.1A>T	p.Met1?	initiator_codon_variant	Exon 2 of 10	ENST00000239926.9	NP_006781.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MYOT	ENST00000239926.9	c.1A>T	p.Met1?	initiator_codon_variant	Exon 2 of 10	1	NM_006790.3	ENSP00000239926.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Myofibrillar myopathy 3 Uncertain:1

Feb 01, 2018

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is not present in population databases (ExAC no frequency). 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. The current clinical and genetic evidence is not sufficient to establish whether loss-of-function variants in MYOT cause disease. This variant has not been reported in the literature in individuals with MYOT-related disease. This sequence change affects the initiator methionine of the MYOT mRNA. The next in-frame methionine is located at codon 64. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.34	D
BayesDel_noAF	Pathogenic	0.25
CADD	Uncertain	24
DANN	Benign	0.96
Eigen	Benign	0.047
Eigen_PC	Benign	0.21
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Uncertain	0.90	D
M_CAP	Pathogenic	0.36	D
MetaRNN	Pathogenic	0.78	D
MetaSVM	Benign	-0.66	T
PROVEAN	Benign	-0.76	N
REVEL	Uncertain	0.39
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Vest4		0.76
MutPred		0.59		Loss of phosphorylation at Y4 (P = 0.1638);
MVP		0.87
ClinPred		0.99	D
GERP RS		5.5
gMVP		0.45

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: rs1561657261; hg19: chr5-137206341;