rs267608640

Variant names:

• chrX-154030370-GCTAA-G
• rs267608640
• NM_001110792.2:c.1490_1493delTTAG

Variant summary

Our verdict is Pathogenic. The variant received 16 ACMG points: 16P and 0B. PVS1 PP4 PM6_Strong PM2_Supporting PS4_Moderate

This summary comes from the ClinGen Evidence Repository: The p.Val485fs (NM_004992) variant in MECP2 is predicted to cause a frameshift that results in a read-through of the stop codon (PVS1). The p.Val485fs variant in MECP2 has been reported as de novo occurrence in at least two individuals (biological parentage unconfirmed) with Rett Syndrome (PMID 11402105, Clinvar Variation ID: 143485) (PM6_strong). The p.Val485fs variant has been observed in at least 3 other individuals with Rett Syndrome (PMID 11402105, PMID 16473305, ClinVar) (PS4_moderate). The p.Val485fs variant in MECP2 is absent from gnomAD (PM2_supporting). The p.Val485fs variant in MECP2 has been reported in an individual with a clinical phenotype suggestive of Rett Syndrome (PMID 11402105) (PP4). In summary the p.Val485fs variant in MECP2 is classified as Pathogenic for Rett syndrome based on the ACMG/AMP criteria (PVS1, PM6_strong, PS4_moderate, PM2_supporting, PP4). LINK:https://erepo.genome.network/evrepo/ui/classification/CA273848/MONDO:0010726/016

• Frequency: Genomes: not found (cov: 22)
• Consequence: MECP2 NM_001110792.2 frameshift
• Clinical Significance: Pathogenic reviewed by expert panel P:3 U:1
• Conservation: PhyloP100: 7.23
• Publications: 3 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 16 ACMG points.

• PVS1: For more information check the summary or visit ClinGen Evidence Repository.
• PS4: For more information check the summary or visit ClinGen Evidence Repository.
• PM2: For more information check the summary or visit ClinGen Evidence Repository.
• PM6: 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.1490_1493delTTAG	p.Val497AlafsTer26	frameshift	Exon 3 of 3	NP_001104262.1	A0A140VKC4
	MECP2	NM_004992.4	MANE Plus Clinical	c.1454_1457delTTAG	p.Val485AlafsTer26	frameshift	Exon 4 of 4	NP_004983.1	D3YJ43
	MECP2	NM_001316337.2		c.1175_1178delTTAG	p.Val392AlafsTer26	frameshift	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.1490_1493delTTAG	p.Val497AlafsTer26	frameshift	Exon 3 of 3	ENSP00000395535.2	P51608-2
	MECP2	ENST00000303391.11	TSL:1 MANE Plus Clinical	c.1454_1457delTTAG	p.Val485AlafsTer26	frameshift	Exon 4 of 4	ENSP00000301948.6	P51608-1
	MECP2	ENST00000630151.3	TSL:5	c.1454_1457delTTAG	p.Val485AlafsTer26	frameshift	Exon 4 of 4	ENSP00000486089.2	P51608-1

Frequencies

GnomAD3 genomes Cov.: 22

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 22

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: reviewed by expert panel

Pathogenic	VUS	Benign	Condition
2	1	-	Rett syndrome (3)
1	-	-	Severe neonatal-onset encephalopathy with microcephaly (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		7.2
Mutation Taster		=0/200	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: rs267608640; hg19: chrX-153295821;