X-154031430-C-T

Variant names:

• chrX-154031430-C-T
• rs61748389
• NM_001110792.2:c.434G>A

Variant summary

Our verdict is Pathogenic. The variant received 18 ACMG points: 18P and 0B. PS3_Supporting PS2 PP4 PP3 PM2_Supporting PM1 PM5_Strong PS4

This summary comes from the ClinGen Evidence Repository: The p.Arg133His variant in MECP2 (NM_004992.3) has been reported as a de novo occurrence (biological parentage both confirmed and unconfirmed) in at least 4 individuals with classic or atypical Rett syndrome (PMID 30569584, 17089071, 30945278) (PS2_very strong, PP4). The p.Arg133His variant has been observed in at least 3 other individuals with classic or atypical Rett syndrome (PMID 16473305, RettBASE) (PS4). Four additional pathogenic missense variants (p.Arg133Cys, p.Arg133Leu, p.Arg133Pro, p.Arg133Gly) have been previously identified within this codon which indicates that this residue is critical to the function of the protein (PMID 23421866, 11738879, 26418480, 16473305, 22368975, 10854091, 11960578, 12180070, Invitae - internal database) (PM5_Strong). Computational prediction analysis tools suggests a deleterious impact; however, this information does not predict clinical significance on its own (PP3). Luciferase reporter and immunofluorescence assays have shown that this variant impacts protein function (PMID 21831886, 12843318) (PS3_supporting). The p.Arg133His variant in MECP2 is absent from gnomAD (PM2_supporting). In summary, the p.Arg133His variant in MECP2 is classified as Pathogenic for Rett syndrome based on the ACMG/AMP criteria (PS2_very strong, PS4, PM5_strong, PS3_supporting, PM2_supporting, PP3, PP4). LINK:https://erepo.genome.network/evrepo/ui/classification/CA274538/MONDO:0010726/016

• Frequency: Genomes: not found (cov: 24)
• Consequence: MECP2 NM_001110792.2 missense
• Clinical Significance: Pathogenic reviewed by expert panel P:4 U:1
• Conservation: PhyloP100: 7.50
• Publications: 28 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: Labcorp Genetics (formerly Invitae), ClinGen, Ambry Genetics, Orphanet, 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: Pathogenic. The variant received 18 ACMG points.

• PS2: For more information check the summary or visit ClinGen Evidence Repository.
• PS3: For more information check the summary or visit ClinGen Evidence Repository.
• PS4: For more information check the summary or visit ClinGen Evidence Repository.
• PM1: For more information check the summary or visit ClinGen Evidence Repository.
• PM2: For more information check the summary or visit ClinGen Evidence Repository.
• PM5: For more information check the summary or visit ClinGen Evidence Repository.
• PP3: For more information check the summary or visit ClinGen Evidence Repository.
• PP4: For more information check the summary or visit ClinGen Evidence Repository.

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

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MECP2	NM_001110792.2	MANE Select	c.434G>A	p.Arg145His	missense	Exon 3 of 3	NP_001104262.1	A0A140VKC4
	MECP2	NM_004992.4	MANE Plus Clinical	c.398G>A	p.Arg133His	missense	Exon 4 of 4	NP_004983.1	D3YJ43
	MECP2	NM_001316337.2		c.119G>A	p.Arg40His	missense	Exon 5 of 5	NP_001303266.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MECP2	ENST00000453960.7	TSL:1 MANE Select	c.434G>A	p.Arg145His	missense	Exon 3 of 3	ENSP00000395535.2	P51608-2
	MECP2	ENST00000303391.11	TSL:1 MANE Plus Clinical	c.398G>A	p.Arg133His	missense	Exon 4 of 4	ENSP00000301948.6	P51608-1
	MECP2	ENST00000630151.3	TSL:5	c.398G>A	p.Arg133His	missense	Exon 4 of 4	ENSP00000486089.2	P51608-1

Frequencies

GnomAD3 genomes Cov.: 24

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 24

Alfa AF: 0.00 Hom.: 0

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: reviewed by expert panel

Pathogenic	VUS	Benign	Condition
2	1	-	Rett syndrome (3)
1	-	-	not provided (1)
1	-	-	Severe neonatal-onset encephalopathy with microcephaly (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.70	D
BayesDel_noAF	Pathogenic	0.76
CADD	Pathogenic	26
DANN	Pathogenic	1.0
DEOGEN2	Pathogenic	0.99	D
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.96	D
M_CAP	Pathogenic	0.93	D
MetaRNN	Pathogenic	0.99	D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Uncertain	2.7	M
PhyloP100		7.5
PrimateAI	Uncertain	0.77	T
PROVEAN	Pathogenic	-5.0	D
REVEL	Pathogenic	0.98
Sift	Pathogenic	0.0	D
Sift4G	Benign	0.063	T
Polyphen		1.0	D
Vest4		0.97
MutPred		0.98		Gain of ubiquitination at K135 (P = 0.0354)
MVP		1.0
ClinPred		1.0	D
GERP RS		5.2
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.96
gMVP		0.98
Mutation Taster		=4/96	disease causing (ClinVar)

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: rs61748389; hg19: chrX-153296881; COSMIC: COSV57652410; COSMIC: COSV57652410;