chrX-154030979-G-A

Position:

• chrX-154030979-G-A

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The ENST00000453960.7(MECP2):​c.885C>T​(p.Ala295=) variant causes a synonymous change. The variant allele was found at a frequency of 0.00000895 in 111,774 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 1 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. A295A) has been classified as Likely benign.

• Frequency: Genomes: 𝑓 0.0000089 (0 hom., 1 hem., cov: 23)
• Consequence: MECP2 ENST00000453960.7 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 4.61

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]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.49).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MECP2	NM_001110792.2	c.885C>T	p.Ala295=	synonymous_variant	3/3	ENST00000453960.7	NP_001104262.1
MECP2	NM_004992.4	c.849C>T	p.Ala283=	synonymous_variant	4/4	ENST00000303391.11	NP_004983.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MECP2	ENST00000453960.7	c.885C>T	p.Ala295=	synonymous_variant	3/3	1	NM_001110792.2	ENSP00000395535
MECP2	ENST00000303391.11	c.849C>T	p.Ala283=	synonymous_variant	4/4	1	NM_004992.4	ENSP00000301948	P1

Frequencies

GnomAD3 genomes AF: 0.00000895 AC: 1 AN: 111774 Hom.: 0 Cov.: 23 AF XY: 0.0000294 AC XY: 1 AN XY: 33962

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.000667

GnomAD4 exome Cov.: 35

GnomAD4 genome AF: 0.00000895 AC: 1 AN: 111774 Hom.: 0 Cov.: 23 AF XY: 0.0000294 AC XY: 1 AN XY: 33962

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.000667

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.49
CADD	Benign	11
DANN	Benign	0.81
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.6

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

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

Publications

LitVar

Other links and lift over

dbSNP: rs61750253; hg19: chrX-153296430;