chrX-154021863-T-TGG

Variant names:

• chrX-154021863-T-TGG
• rs267608360
• NM_001110792.2:c.*8502_*8503dupCC

Variant summary

Our verdict is Benign. The variant received -8 ACMG points: 0P and 8B. BS1 BS2

The NM_001110792.2(MECP2):​c.*8502_*8503dupCC variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: 𝑓 0.0010 (0 hom., 8 hem., cov: 16)
  • Exomes 𝑓: 0.0 (0 hom. 0 hem.)
  • Failed GnomAD Quality Control
• Consequence: MECP2 NM_001110792.2 3_prime_UTR
• Clinical Significance: Not reported in ClinVar
• 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 -8 ACMG points.

• BS1: Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.00105 (76/72677) while in subpopulation AFR AF = 0.0017 (35/20627). AF 95% confidence interval is 0.00125. There are 0 homozygotes in GnomAd4. There are 8 alleles in the male GnomAd4 subpopulation. Median coverage is 16. This position passed quality control check.
• BS2: High AC in GnomAd4 at 76 XL,Unknown,AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MECP2	NM_001110792.2	c.*8502_*8503dupCC		3_prime_UTR_variant	Exon 3 of 3	ENST00000453960.7	NP_001104262.1
MECP2	NM_004992.4	c.*8502_*8503dupCC		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.*8502_*8503dupCC		3_prime_UTR_variant	Exon 3 of 3	1	NM_001110792.2	ENSP00000395535.2
MECP2	ENST00000303391.11	c.*8502_*8503dupCC		3_prime_UTR_variant	Exon 4 of 4	1	NM_004992.4	ENSP00000301948.6
MECP2	ENST00000630151.3	c.*8502_*8503dupCC		3_prime_UTR_variant	Exon 4 of 4	5		ENSP00000486089.2

Frequencies

GnomAD3 genomes AF: 0.00105 AC: 76 AN: 72651 Hom.: 0 Cov.: 16

Gnomad AFR AF: 0.00170

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000307

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00158

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00453

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000683

Gnomad OTH AF: 0.00

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 182 Hom.: 0 Cov.: 0 AF XY: 0.00 AC XY: 0 AN XY: 64

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: 0.00 AC: 0 AN: 181

Middle Eastern (MID) AC: 0 AN: 0

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

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

GnomAD4 genome AF: 0.00105 AC: 76 AN: 72677 Hom.: 0 Cov.: 16 AF XY: 0.000513 AC XY: 8 AN XY: 15583

African (AFR) AF: 0.00170 AC: 35 AN: 20627

American (AMR) AF: 0.000306 AC: 2 AN: 6528

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 1857

East Asian (EAS) AF: 0.00159 AC: 3 AN: 1889

South Asian (SAS) AF: 0.00 AC: 0 AN: 1082

European-Finnish (FIN) AF: 0.00453 AC: 11 AN: 2426

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 164

European-Non Finnish (NFE) AF: 0.000683 AC: 25 AN: 36629

Other (OTH) AF: 0.00 AC: 0 AN: 982

Alfa AF: 0.0000699 Hom.: 36

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

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

Splicing

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

Other links and lift over

dbSNP: rs267608360; hg19: chrX-153287314;