rs768570497

Positions:

• chr5-88722779-G-A

Variant summary

Our verdict is Likely benign. Variant got -5 ACMG points: 1P and 6B. PP2 BP4_Moderate BS2

The NM_002397.5(MEF2C):​c.1247C>T​(p.Ala416Val) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000616 in 1,461,712 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000062 (0 hom.)
• Consequence: MEF2C NM_002397.5 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 7.65

Genes affected

MEF2C (HGNC:6996): (myocyte enhancer factor 2C) This locus encodes a member of the MADS box transcription enhancer factor 2 (MEF2) family of proteins, which play a role in myogenesis. The encoded protein, MEF2 polypeptide C, has both trans-activating and DNA binding activities. This protein may play a role in maintaining the differentiated state of muscle cells. Mutations and deletions at this locus have been associated with severe cognitive disability, stereotypic movements, epilepsy, and cerebral malformation. Alternatively spliced transcript variants have been described. [provided by RefSeq, Jul 2010]

MEF2C-AS2 (HGNC:53115): (MEF2C antisense RNA 2)

ACMG classification

Verdict is Likely_benign. Variant got -5 ACMG points.

• PP2: Missense variant where missense usually causes diseases, MEF2C
• BP4: Computational evidence support a benign effect (MetaRNN=0.2208811).
• BS2: High AC in GnomAdExome4 at 9 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MEF2C	NM_002397.5	c.1247C>T	p.Ala416Val	missense_variant	11/11	ENST00000504921.7
MEF2C-AS2	NR_146284.1	n.411G>A		non_coding_transcript_exon_variant	4/4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MEF2C	ENST00000504921.7	c.1247C>T	p.Ala416Val	missense_variant	11/11	1	NM_002397.5
MEF2C-AS2	ENST00000657578.1	n.232-39218G>A		intron_variant, non_coding_transcript_variant

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000616 AC: 9 AN: 1461712 Hom.: 0 Cov.: 33 AF XY: 0.00000550 AC XY: 4 AN XY: 727138

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000224

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: 0.00000630

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000468 Hom.: 0

ExAC AF: 0.00000827 AC: 1

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Intellectual disability, autosomal dominant 20 Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Institute of Human Genetics, University of Leipzig Medical Center	Nov 22, 2018	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Invitae	Jul 19, 2022	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. Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0"). ClinVar contains an entry for this variant (Variation ID: 538815). This variant has not been reported in the literature in individuals affected with MEF2C-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces alanine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 416 of the MEF2C protein (p.Ala416Val). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.092
BayesDel_addAF	Benign	0.011	T
BayesDel_noAF	Benign	-0.22
CADD	Pathogenic	32
DANN	Uncertain	1.0
DEOGEN2	Benign	0.076	T;.;.;T;.;.;T;T;.;T;.;.;.;T;T;.;.;.;.
Eigen	Uncertain	0.47
Eigen_PC	Uncertain	0.61
FATHMM_MKL	Pathogenic	1.0	D
M_CAP	Benign	0.060	D
MetaRNN	Benign	0.22	T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T
MetaSVM	Benign	-0.52	T
MutationAssessor	Benign	0.81	L;.;.;.;.;.;L;.;.;.;.;.;.;L;.;.;.;.;.
MutationTaster	Benign	1.0	D;D;D;D;D;D;D;D;D;D
PrimateAI	Uncertain	0.68	T
PROVEAN	Benign	-0.71	N;N;N;.;.;.;N;.;.;.;.;N;.;.;.;.;.;.;.
REVEL	Benign	0.24
Sift	Benign	0.26	T;T;T;.;.;.;T;.;.;.;.;T;.;.;.;.;.;.;.
Sift4G	Benign	0.63	T;T;T;.;.;T;T;T;T;T;.;T;T;.;T;T;.;T;T
Polyphen		0.95	P;.;.;.;.;.;P;.;.;.;.;.;B;P;.;B;.;.;.
Vest4		0.20
MutPred		0.071		Loss of catalytic residue at A416 (P = 0.1315);.;.;.;.;.;Loss of catalytic residue at A416 (P = 0.1315);.;.;.;.;.;.;Loss of catalytic residue at A416 (P = 0.1315);.;.;.;.;.;
MVP		0.83
MPC		2.2
ClinPred		0.76	D
GERP RS		5.7
Varity_R		0.11
gMVP		0.26

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: rs768570497; hg19: chr5-88018596; COSMIC: COSV60937207; COSMIC: COSV60937207;