Genetic Variant MECP2:p.Val234Val (chrX-154031162-G-C) – ACMG Classification: Benign (-17 pts)

Variant summary

Our verdict is Benign. The variant received -17 ACMG points: 0P and 17B. BP4_StrongBP6_Very_StrongBP7BS2

The NM_001110792.2(MECP2):c.702C>G(p.Val234Val) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000154 in 1,098,237 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 55 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

Frequency

Genomes: 𝑓 0.000018 ( 0 hom., 0 hem., cov: 22)

Exomes 𝑓: 0.00015 ( 0 hom. 55 hem. )

Failed GnomAD Quality Control

Consequence

MECP2
NM_001110792.2 synonymous

Scores

Clinical Significance

Benign criteria provided, multiple submitters, no conflicts B:4

Conservation

PhyloP100: 1.26

Publications

2 publications found

Variant links:

Genes affected

MECP2 (HGNC:6990): (methyl-CpG binding protein 2) DNA methylation is the major modification of eukaryotic genomes and plays an essential role in mammalian development. Human proteins MECP2, MBD1, MBD2, MBD3, and MBD4 comprise a family of nuclear proteins related by the presence in each of a methyl-CpG binding domain (MBD). Each of these proteins, with the exception of MBD3, is capable of binding specifically to methylated DNA. MECP2, MBD1 and MBD2 can also repress transcription from methylated gene promoters. In contrast to other MBD family members, MECP2 is X-linked and subject to X inactivation. MECP2 is dispensible in stem cells, but is essential for embryonic development. MECP2 gene mutations are the cause of most cases of Rett syndrome, a progressive neurologic developmental disorder and one of the most common causes of cognitive disability in females. Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Oct 2015]

MECP2 Gene-Disease associations (from GenCC):

chromosome Xq28 duplication syndrome
Inheritance: XL Classification: DEFINITIVE Submitted by: G2P
Rett syndrome
Inheritance: XL Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae), Ambry Genetics, ClinGen, G2P
severe neonatal-onset encephalopathy with microcephaly
Inheritance: XL Classification: DEFINITIVE, SUPPORTIVE Submitted by: G2P, Orphanet
syndromic X-linked intellectual disability Lubs type
Inheritance: XL Classification: DEFINITIVE Submitted by: G2P
atypical Rett syndrome
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
non-syndromic X-linked intellectual disability
Inheritance: XL Classification: SUPPORTIVE Submitted by: Orphanet
X-linked intellectual disability-psychosis-macroorchidism syndrome
Inheritance: XL Classification: SUPPORTIVE Submitted by: Orphanet
systemic lupus erythematosus
Inheritance: Unknown Classification: SUPPORTIVE Submitted by: Orphanet

MECP2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -17 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.54).

BP6

Variant X-154031162-G-C is Benign according to our data. Variant chrX-154031162-G-C is described in ClinVar as Benign. ClinVar VariationId is 143651.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BP7

Synonymous conserved (PhyloP=1.26 with no splicing effect.

BS2

High AC in GnomAdExome4 at 169 XL,Unknown,AD gene.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001110792.2. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
MECP2	NM_001110792.2	MANE Select	c.702C>G	p.Val234Val	synonymous	Exon 3 of 3	NP_001104262.1
MECP2	NM_004992.4	MANE Plus Clinical	c.666C>G	p.Val222Val	synonymous	Exon 4 of 4	NP_004983.1
MECP2	NM_001316337.2		c.387C>G	p.Val129Val	synonymous	Exon 5 of 5	NP_001303266.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
MECP2	ENST00000453960.7	TSL:1 MANE Select	c.702C>G	p.Val234Val	synonymous	Exon 3 of 3	ENSP00000395535.2
MECP2	ENST00000303391.11	TSL:1 MANE Plus Clinical	c.666C>G	p.Val222Val	synonymous	Exon 4 of 4	ENSP00000301948.6
MECP2	ENST00000630151.3	TSL:5	c.666C>G	p.Val222Val	synonymous	Exon 4 of 4	ENSP00000486089.2

Frequencies

GnomAD3 genomes

AF:

0.0000182

AC:

AN:

109598

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000382

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000381

AC:

AN:

183514

AF XY:

0.0000736

show subpopulations

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 FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000854

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000154

AC:

169

AN:

1098237

Hom.:

Cov.:

AF XY:

0.000151

AC XY:

AN XY:

363591

show subpopulations

African (AFR)

AF:

0.0000379

AC:

AN:

26402

American (AMR)

AF:

0.00

AC:

AN:

35207

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

19386

East Asian (EAS)

AF:

0.00

AC:

AN:

30206

South Asian (SAS)

AF:

0.0000185

AC:

AN:

54144

European-Finnish (FIN)

AF:

0.00

AC:

AN:

40532

Middle Eastern (MID)

AF:

0.00

AC:

AN:

4137

European-Non Finnish (NFE)

AF:

0.000191

AC:

161

AN:

842127

Other (OTH)

AF:

0.000130

AC:

AN:

46096

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.487

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

Data not reliable, filtered out with message: AS_VQSR

AF:

0.0000182

AC:

AN:

109598

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

31928

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

29933

American (AMR)

AF:

0.00

AC:

AN:

10439

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

2624

East Asian (EAS)

AF:

0.00

AC:

AN:

3468

South Asian (SAS)

AF:

0.00

AC:

AN:

2415

European-Finnish (FIN)

AF:

0.00

AC:

AN:

5980

Middle Eastern (MID)

AF:

0.00

AC:

AN:

239

European-Non Finnish (NFE)

AF:

0.0000382

AC:

AN:

52369

Other (OTH)

AF:

0.00

AC:

AN:

1459

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.625

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.0000227

EpiCase

AF:

0.000109

EpiControl

AF:

0.000178

ClinVar

Significance: Benign

Submissions summary: Benign:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Rett syndrome

Benign:1

Mar 14, 2024

Centre for Population Genomics, CPG

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:curation

This variant has been collected from RettBASE and curated to current modified ACMG/AMP criteria. Based on the classification scheme defined by the ClinGen Rett/Angelman-like Expert Panel for Rett/AS-like Disorders Specifications to the ACMG/AMP Variant Interpretation Guidelines VCEP 3.0, this variant is classified as benign. At least the following criteria are met: The allele frequency of this variant in at least one population in gnomAD is higher than the 0.03% threshold defined by the ClinGen Rett/Angelman-like Expert Panel for Rett/AS-like Disorders VCEP 3.0 (BA1).

not specified

Benign:1

Aug 24, 2010

RettBASE

Significance:Benign

Review Status:no assertion criteria provided

Collection Method:curation

Severe neonatal-onset encephalopathy with microcephaly

Benign:1

Jun 03, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

MECP2-related disorder

Benign:1

Mar 13, 2024

PreventionGenetics, part of Exact Sciences

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications).

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.54

CADD

Benign

7.3

(source)

DANN

Benign

0.76

PhyloP100

1.3

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Mutation Taster

=94/6

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over