rs1557134819

Variant names:

• chrX-154030353-CGCTCCGTGTAAAGTCAGCTAACTCTCTCGGTCACGGGCGTCCGGCTGTCCACAGGCTCCTCTCTGTTTGGCCTTGGCATGGAGGATGAAACAATGTCTTTGCGCTCTCCCTCCCCTCGGTGTTTGTACTTTTCTGCGGCCGTGGCGGCGGTGGCAACCGCGGGCTGAGTCTTAGCTGGCTCCTTGGGGCAGCCGTCGCTCTCCAGTGAGCCTCCTCTGGGCATCTTCTCCTCTTTGCAGACGCTGCTGCTCAAGTCCTGGGGCTCAGGGGGGCTGGTGGGGTCCTCGGAGCTCTCGGGCTCAGGTGGAGGTGGGGGCAGGGGTGGGAGCAGTGGCACGGGGGCCTTTGGGGACTCTGAGTGGTGGTGATGGTGGTGGT-C
• rs1557134819
• NM_001110792.2:c.1133_*13del

Variant summary

Our verdict is Likely pathogenic. The variant received 8 ACMG points: 8P and 0B. PVS1

The NM_001110792.2(MECP2):​c.1133_*13del​(p.His378_Ter499delins???) variant causes a stop lost, conservative inframe deletion change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. It is difficult to determine the true allele frequency of this variant because it is of type DEL_BIG, and the frequency of such variant types in population databases may be underestimated and unreliable. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. H378H) has been classified as Likely benign. The gene MECP2 is included in the ClinGen Criteria Specification Registry.

• Frequency: Genomes: not found (cov: 22)
• Consequence: MECP2 NM_001110792.2 stop_lost, conservative_inframe_deletion
• Clinical Significance: Uncertain significance criteria provided, single submitter P:1 U:1
• Conservation: PhyloP100: 1.98
• 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: 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

Specifications for MECP2 are available in the ClinGen Criteria Specification Registry and recommended for reference when assigning criteria.

Our verdict: Likely_pathogenic. The variant received 8 ACMG points.

• PVS1: Stoplost variant. No alternative stopcodon identified downstream, so we assume a Nonstop Mediated Decay. LoF is a known mechanism of disease.

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.1133_*13del	p.His378_Ter499delins???	stop_lost conservative_inframe_deletion	Exon 3 of 3	NP_001104262.1	A0A140VKC4
	MECP2	NM_004992.4	MANE Plus Clinical	c.1097_*13del	p.His366_Ter487delins???	stop_lost conservative_inframe_deletion	Exon 4 of 4	NP_004983.1	D3YJ43
	MECP2	NM_001110792.2	MANE Select	c.1133_*13del		3_prime_UTR	Exon 3 of 3	NP_001104262.1	A0A140VKC4

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MECP2	ENST00000453960.7	TSL:1 MANE Select	c.1133_*13del	p.His378_Ter499delins???	stop_lost conservative_inframe_deletion	Exon 3 of 3	ENSP00000395535.2	P51608-2
	MECP2	ENST00000303391.11	TSL:1 MANE Plus Clinical	c.1097_*13del	p.His366_Ter487delins???	stop_lost conservative_inframe_deletion	Exon 4 of 4	ENSP00000301948.6	P51608-1
	MECP2	ENST00000453960.7	TSL:1 MANE Select	c.1133_*13del		3_prime_UTR	Exon 3 of 3	ENSP00000395535.2	P51608-2

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: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
1	1	-	Rett syndrome (2)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		2.0
Mutation Taster		=0/200	disease causing (ClinVar)

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs1557134819; hg19: chrX-153295804;