22-40411491-C-G

Variant names:

• chr22-40411491-C-G
• NM_020831.6:c.2995G>C

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_020831.6(MRTFA):​c.2995G>C​(p.Val999Leu) variant causes a missense 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. 11/19 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: MRTFA NM_020831.6 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.42

Genes affected

MRTFA (HGNC:14334): (myocardin related transcription factor A) The protein encoded by this gene interacts with the transcription factor myocardin, a key regulator of smooth muscle cell differentiation. The encoded protein is predominantly nuclear and may help transduce signals from the cytoskeleton to the nucleus. This gene is involved in a specific translocation event that creates a fusion of this gene and the RNA-binding motif protein-15 gene. This translocation has been associated with acute megakaryocytic leukemia. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Sep 2013]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.22947848).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MRTFA	NM_020831.6	c.2995G>C	p.Val999Leu	missense_variant	Exon 15 of 15	ENST00000355630.10	NP_065882.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MRTFA	ENST00000355630.10	c.2995G>C	p.Val999Leu	missense_variant	Exon 15 of 15	1	NM_020831.6	ENSP00000347847.5

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

not provided Uncertain:1

Nov 16, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces valine, which is neutral and non-polar, with leucine, which is neutral and non-polar, at codon 899 of the MKL1 protein (p.Val899Leu). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with MKL1-related conditions. An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be tolerated. 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

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.14
BayesDel_addAF	Benign	-0.14	T
BayesDel_noAF	Benign	-0.44
CADD	Benign	21
DANN	Uncertain	1.0
DEOGEN2	Benign	0.072	T;T;T;T;T;T
Eigen	Uncertain	0.20
Eigen_PC	Benign	0.21
FATHMM_MKL	Uncertain	0.86	D
LIST_S2	Benign	0.83	.;T;T;T;T;T
M_CAP	Benign	0.015	T
MetaRNN	Benign	0.23	T;T;T;T;T;T
MetaSVM	Benign	-0.93	T
PrimateAI	Uncertain	0.49	T
PROVEAN	Benign	-1.3	N;.;N;N;.;.
REVEL	Benign	0.071
Sift	Benign	0.12	T;.;T;T;.;.
Sift4G	Benign	0.063	T;T;T;T;T;T
Polyphen		1.0	D;.;P;D;.;.
Vest4		0.33
MutPred		0.35		Gain of disorder (P = 0.0597);.;.;Gain of disorder (P = 0.0597);.;.;
MVP		0.28
MPC		0.054
ClinPred		0.72	D
GERP RS		4.8
Varity_R		0.097

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr22-40807495;