chrX-154030768-G-A

Variant names:

Variant summary

Our verdict is Benign. The variant received -8 ACMG points: 0P and 8B. BS1BS2

This summary comes from the ClinGen Evidence Repository: The allele frequency of the p.Arg354Cys variant in MECP2 (NM_004992.3) is 0.028% in East Asian sub population in gnomAD, which is high enough to meet the BS1 criteria based on thresholds defined by the ClinGen Rett/Angelman-like Expert Panel for Rett/AS-like conditions (BS1). The p.Arg354Cys variant is observed in at least 2 unaffected individuals (internal database) (BS2). In summary, the p.Arg354Cys variant in MECP2 is classified as Benign based on the ACMG/AMP criteria (BS1, BS2). LINK:https://erepo.genome.network/evrepo/ui/classification/CA206493/MONDO:0010726/016

Frequency

Genomes: 𝑓 0.000054 ( 0 hom., 2 hem., cov: 23)

Exomes 𝑓: 0.000086 ( 0 hom. 33 hem. )

Consequence

MECP2
NM_001110792.2 missense

Scores

Clinical Significance

Benign reviewed by expert panel U:3B:5

Conservation

PhyloP100: 3.24

Publications

7 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 -8 ACMG points.

BS1

For more information check the summary or visit ClinGen Evidence Repository.

BS2

For more information check the summary or visit ClinGen Evidence Repository.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MECP2	NM_001110792.2 link	c.1096C>T	p.Arg366Cys	missense_variant	Exon 3 of 3	ENST00000453960.7	NP_001104262.1	P51608-2A0A140VKC4Q59FJ6
MECP2	NM_004992.4 link	c.1060C>T	p.Arg354Cys	missense_variant	Exon 4 of 4	ENST00000303391.11	NP_004983.1	P51608-1D3YJ43Q59FJ6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MECP2	ENST00000453960.7 link	c.1096C>T	p.Arg366Cys	missense_variant	Exon 3 of 3	1	NM_001110792.2	ENSP00000395535.2		P51608-2
MECP2	ENST00000303391.11 link	c.1060C>T	p.Arg354Cys	missense_variant	Exon 4 of 4	1	NM_004992.4	ENSP00000301948.6		P51608-1

Frequencies

GnomAD3 genomes

AF:

0.0000539

AC:

AN:

111401

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000654

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000282

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000567

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000274

AC:

AN:

182156

AF XY:

0.0000297

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:

0.0000616

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000856

AC:

AN:

1097964

Hom.:

Cov.:

AF XY:

0.0000908

AC XY:

AN XY:

363344

show subpopulations

African (AFR)

AF:

0.0000379

AC:

AN:

26399

American (AMR)

AF:

0.00

AC:

AN:

35200

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

19370

East Asian (EAS)

AF:

0.0000331

AC:

AN:

30204

South Asian (SAS)

AF:

0.0000185

AC:

AN:

54142

European-Finnish (FIN)

AF:

0.0000247

AC:

AN:

40500

Middle Eastern (MID)

AF:

0.00

AC:

AN:

4127

European-Non Finnish (NFE)

AF:

0.000102

AC:

AN:

841934

Other (OTH)

AF:

0.0000868

AC:

AN:

46088

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.450

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

AF:

0.0000539

AC:

AN:

111401

Hom.:

Cov.:

AF XY:

0.0000595

AC XY:

AN XY:

33589

show subpopulations

African (AFR)

AF:

0.0000654

AC:

AN:

30600

American (AMR)

AF:

0.00

AC:

AN:

10605

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

2646

East Asian (EAS)

AF:

0.000282

AC:

AN:

3551

South Asian (SAS)

AF:

0.00

AC:

AN:

2659

European-Finnish (FIN)

AF:

0.00

AC:

AN:

6031

Middle Eastern (MID)

AF:

0.00

AC:

AN:

236

European-Non Finnish (NFE)

AF:

0.0000567

AC:

AN:

52892

Other (OTH)

AF:

0.00

AC:

AN:

1498

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.513

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome 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

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.0000567

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000297

AC:

ExAC

AF:

0.0000494

AC:

EpiCase

AF:

0.000109

EpiControl

AF:

0.00

ClinVar

Significance: Benign

Submissions summary: Uncertain:3Benign:5

Revision: reviewed by expert panel

LINK: link

Submissions by phenotype

not provided

Uncertain:2Benign:1

Mar 18, 2021

GeneDx

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Department of Pathology and Laboratory Medicine, Sinai Health System

Significance:Uncertain significance

Review Status:no assertion criteria provided

Collection Method:clinical testing

The MECP2 p.R354C variant was not identified in the literature nor was it identified in Cosmic. The variant was identified in dbSNP (ID: rs143876280), LOVD 3.0 and ClinVar (classified as conflicting interpretations of pathogenicity with University of Chicago Genetic Services Laboratory classifying the variant as likely benign and Molecular Diagnostics Lab, Nemours Alfred I. duPont Hospital for Children and EGL Genetics classifying the variant as uncertain significance). The variant was identified in control databases in 5 of 182156 chromosomes (0 homozygous; 2 hemizygous) at a frequency of 0.000027 (Genome Aggregation Database March 6, 2019, v2.1.1). The variant was observed in the European (non-Finnish) population in 5 of 81121 chromosomes (freq: 0.00006), but was not observed in the African, Latino, Ashkenazi Jewish, East Asian, European (Finnish), Other or South Asian populations. The p.Arg354 residue is not conserved in mammals and computational analyses (PolyPhen-2, SIFT, AlignGVGD, BLOSUM, MutationTaster) provide inconsistent predictions regarding the impact to the protein; this information is not very predictive of pathogenicity. The variant occurs outside of the splicing consensus sequence and in silico or computational prediction software programs (SpliceSiteFinder, MaxEntScan, NNSPLICE, GeneSplicer) do not predict a difference in splicing. In summary, based on the above information the clinical significance of this variant cannot be determined with certainty at this time. This variant is classified as a variant of uncertain significance. -

Apr 03, 2015

Eurofins Ntd Llc (ga)

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

not specified

Uncertain:1Benign:1

Dec 20, 2013

Genetic Services Laboratory, University of Chicago

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Jul 06, 2015

Molecular Diagnostics Lab, Nemours Children's Health, Delaware

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Rett syndrome

Benign:1

Dec 09, 2022

ClinGen Rett and Angelman-like Disorders Variant Curation Expert Panel

Significance:Benign

Review Status:reviewed by expert panel

Collection Method:curation

The allele frequency of the p.Arg354Cys variant in MECP2 (NM_004992.3) is 0.028% in East Asian sub population in gnomAD, which is high enough to meet the BS1 criteria based on thresholds defined by the ClinGen Rett/Angelman-like Expert Panel for Rett/AS-like conditions (BS1). The p.Arg354Cys variant is observed in at least 2 unaffected individuals (internal database) (BS2). In summary, the p.Arg354Cys variant in MECP2 is classified as Benign based on the ACMG/AMP criteria (BS1, BS2). -

Severe neonatal-onset encephalopathy with microcephaly

Benign:1

Dec 02, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

MECP2-related disorder

Benign:1

Apr 09, 2024

PreventionGenetics, part of Exact Sciences

Significance:Benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

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

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.29

BayesDel_addAF

Uncertain

0.16

BayesDel_noAF

Pathogenic

0.17

CADD

Uncertain

(source)

DANN

Uncertain

0.99

DEOGEN2

Benign

0.29

T;.

FATHMM_MKL

Benign

0.74

LIST_S2

Uncertain

0.95

D;D

M_CAP

Pathogenic

0.66

MetaRNN

Uncertain

0.45

T;T

MetaSVM

Uncertain

0.21

MutationAssessor

Benign

1.4

L;.

PhyloP100

3.2

PrimateAI

Uncertain

0.64

PROVEAN

Benign

-0.27

N;N

REVEL

Uncertain

0.54

Sift

Uncertain

0.0010

D;D

Sift4G

Uncertain

0.053

T;T

Polyphen

0.97

D;D

Vest4

0.42

MVP

0.95

ClinPred

0.27

GERP RS

5.1

Varity_R

0.18

gMVP

0.70

Mutation Taster

=82/18

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

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over