chrX-154021863-T-TG

Variant names:

• chrX-154021863-T-TG
• rs267608360
• NM_001110792.2:c.*8503dupC

Variant summary

Our verdict is Benign. The variant received -10 ACMG points: 0P and 10B. BP6_Moderate BA1

The NM_001110792.2(MECP2):​c.*8503dupC variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. Variant has been reported in ClinVar as Benign (★).

• Frequency:
  • Genomes: 𝑓 0.095 (397 hom., 622 hem., cov: 16)
  • Exomes 𝑓: 0.056 (0 hom. 0 hem.)
• Consequence: MECP2 NM_001110792.2 3_prime_UTR
• Clinical Significance: Benign criteria provided, single submitter B:2
• Conservation: PhyloP100: 1.18
• 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: Benign. The variant received -10 ACMG points.

• BP6: Variant X-154021863-T-TG is Benign according to our data. Variant chrX-154021863-T-TG is described in ClinVar as [Benign]. Clinvar id is 143289.Status of the report is criteria_provided_single_submitter, 1 stars.
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.187 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MECP2	NM_001110792.2	c.*8503dupC		3_prime_UTR_variant	Exon 3 of 3	ENST00000453960.7	NP_001104262.1
MECP2	NM_004992.4	c.*8503dupC		3_prime_UTR_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.*8503dupC		3_prime_UTR_variant	Exon 3 of 3	1	NM_001110792.2	ENSP00000395535.2
MECP2	ENST00000303391.11	c.*8503dupC		3_prime_UTR_variant	Exon 4 of 4	1	NM_004992.4	ENSP00000301948.6
MECP2	ENST00000630151.3	c.*8503dupC		3_prime_UTR_variant	Exon 4 of 4	5		ENSP00000486089.2

Frequencies

GnomAD3 genomes AF: 0.0949 AC: 6882 AN: 72489 Hom.: 397 Cov.: 16

Gnomad AFR AF: 0.192

Gnomad AMI AF: 0.0183

Gnomad AMR AF: 0.0414

Gnomad ASJ AF: 0.0490

Gnomad EAS AF: 0.0248

Gnomad SAS AF: 0.0297

Gnomad FIN AF: 0.0437

Gnomad MID AF: 0.0730

Gnomad NFE AF: 0.0629

Gnomad OTH AF: 0.0765

GnomAD4 exome AF: 0.0556 AC: 10 AN: 180 Hom.: 0 Cov.: 0 AF XY: 0.00 AC XY: 0 AN XY: 62

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AC: 0 AN: 0

American (AMR) AC: 0 AN: 0

Ashkenazi Jewish (ASJ) AC: 0 AN: 0

East Asian (EAS) AC: 0 AN: 0

South Asian (SAS) AC: 0 AN: 0

European-Finnish (FIN) AF: 0.0559 AC: 10 AN: 179

Middle Eastern (MID) AC: 0 AN: 0

European-Non Finnish (NFE) AC: 0 AN: 0

Other (OTH) AF: 0.00 AC: 0 AN: 1

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000003), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome AF: 0.0949 AC: 6884 AN: 72515 Hom.: 397 Cov.: 16 AF XY: 0.0400 AC XY: 622 AN XY: 15553

African (AFR) AF: 0.192 AC: 3944 AN: 20544

American (AMR) AF: 0.0413 AC: 269 AN: 6516

Ashkenazi Jewish (ASJ) AF: 0.0490 AC: 91 AN: 1856

East Asian (EAS) AF: 0.0249 AC: 47 AN: 1889

South Asian (SAS) AF: 0.0296 AC: 32 AN: 1082

European-Finnish (FIN) AF: 0.0437 AC: 105 AN: 2404

Middle Eastern (MID) AF: 0.0732 AC: 12 AN: 164

European-Non Finnish (NFE) AF: 0.0629 AC: 2301 AN: 36587

Other (OTH) AF: 0.0755 AC: 74 AN: 980

Alfa AF: 0.00951 Hom.: 36

ClinVar

Significance: Benign

Submissions summary: Benign:2

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Benign:1

Mar 10, 2010

RettBASE

Significance: Benign

Review Status: no assertion criteria provided

Collection Method: curation

- -

Rett syndrome Benign:1

Oct 11, 2023

Centre for Population Genomics, CPG

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: curation

This variant has been collected from RettBASE and curated to current modified ACMG/AMP criteria. Based on the classification scheme defined by the ClinGen Rett/Angelman-like Expert Panel for Rett/AS-like Disorders Specifications to the ACMG/AMP Variant Interpretation Guidelines VCEP 2.0, this variant is classified as benign. At least the following criteria are met: The allele frequency of this variant in at least one population in gnomAD is higher than the 0.03% threshold defined by the ClinGen Rett/Angelman-like Expert Panel for Rett/AS-like Disorders VCEP 2.0 (BA1). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		1.2
Mutation Taster		=100/0	polymorphism (auto)

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: rs267608360; hg19: chrX-153287314;