X-154031137-C-G

Variant names:

• chrX-154031137-C-G
• rs587783139
• NM_001110792.2:c.727G>C

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 4P and 2B. PM1 PM2 BP6_Moderate

The NM_001110792.2(MECP2):​c.727G>C​(p.Gly243Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Benign (★). Another nucleotide change resulting in the same amino acid substitution has been previously reported as Likely benign in ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G243A) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 23)
• Consequence: MECP2 NM_001110792.2 missense
• Clinical Significance: Benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 3.57
• Publications: 0 publications found

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

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM1: In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 6 benign, 12 uncertain in NM_001110792.2
• PM2: Very rare variant in population databases, with high coverage
• BP6: Variant X-154031137-C-G is Benign according to our data. Variant chrX-154031137-C-G is described in CliVar as Benign. Clinvar id is 2845786.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chrX-154031137-C-G is described in CliVar as Benign. Clinvar id is 2845786.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chrX-154031137-C-G is described in CliVar as Benign. Clinvar id is 2845786.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chrX-154031137-C-G is described in CliVar as Benign. Clinvar id is 2845786.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chrX-154031137-C-G is described in CliVar as Benign. Clinvar id is 2845786.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chrX-154031137-C-G is described in CliVar as Benign. Clinvar id is 2845786.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chrX-154031137-C-G is described in CliVar as Benign. Clinvar id is 2845786.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chrX-154031137-C-G is described in CliVar as Benign. Clinvar id is 2845786.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chrX-154031137-C-G is described in CliVar as Benign. Clinvar id is 2845786.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chrX-154031137-C-G is described in CliVar as Benign. Clinvar id is 2845786.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chrX-154031137-C-G is described in CliVar as Benign. Clinvar id is 2845786.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chrX-154031137-C-G is described in CliVar as Benign. Clinvar id is 2845786.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chrX-154031137-C-G is described in CliVar as Benign. Clinvar id is 2845786.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chrX-154031137-C-G is described in CliVar as Benign. Clinvar id is 2845786.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chrX-154031137-C-G is described in CliVar as Benign. Clinvar id is 2845786.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MECP2	NM_001110792.2	c.727G>C	p.Gly243Arg	missense_variant	Exon 3 of 3	ENST00000453960.7	NP_001104262.1
MECP2	NM_004992.4	c.691G>C	p.Gly231Arg	missense_variant	Exon 4 of 4	ENST00000303391.11	NP_004983.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MECP2	ENST00000453960.7	c.727G>C	p.Gly243Arg	missense_variant	Exon 3 of 3	1	NM_001110792.2	ENSP00000395535.2
MECP2	ENST00000303391.11	c.691G>C	p.Gly231Arg	missense_variant	Exon 4 of 4	1	NM_004992.4	ENSP00000301948.6

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Cov.: 36

GnomAD4 genome Cov.: 23

ClinVar

Significance: Benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

Severe neonatal-onset encephalopathy with microcephaly Benign:1

Mar 14, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.35
BayesDel_addAF	Pathogenic	0.27	D
BayesDel_noAF	Pathogenic	0.14
CADD	Benign	23
DANN	Uncertain	1.0
DEOGEN2	Benign	0.24	T;.;T;T
FATHMM_MKL	Benign	0.54	D
LIST_S2	Uncertain	0.96	D;D;D;D
M_CAP	Pathogenic	0.85	D
MetaRNN	Uncertain	0.52	D;D;D;D
MetaSVM	Uncertain	0.25	D
MutationAssessor	Benign	1.5	L;.;.;.
PhyloP100		3.6
PrimateAI	Uncertain	0.66	T
PROVEAN	Benign	-0.24	N;N;.;.
REVEL	Uncertain	0.45
Sift	Uncertain	0.0020	D;D;.;.
Sift4G	Uncertain	0.032	D;D;.;D
Polyphen		0.65	P;P;.;.
Vest4		0.29
MutPred		0.17		Gain of solvent accessibility (P = 0.0037);.;Gain of solvent accessibility (P = 0.0037);.;
MVP		0.96
ClinPred		0.85	D
GERP RS		5.5
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.35
gMVP		0.48
Mutation Taster		=88/12	polymorphism

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

Other links and lift over

dbSNP: rs587783139; hg19: chrX-153296588;