rs3027920

Positions:

• chrX-154025791-T-G

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 0P and 12B. BP4_Moderate BP6_Moderate BA1

The NM_001110792.2(MECP2):​c.*4576A>C variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.022 in 112,960 control chromosomes in the GnomAD database, including 72 homozygotes. There are 696 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★).

• Frequency:
  • Genomes: 𝑓 0.022 (72 hom., 696 hem., cov: 24)
  • Exomes 𝑓: 0.0 (0 hom. 0 hem.)
  • Failed GnomAD Quality Control
• Consequence: MECP2 NM_001110792.2 3_prime_UTR
• Clinical Significance: Benign criteria provided, single submitter B:2
• Conservation: PhyloP100: 1.29

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 Benign. Variant got -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.4).
• BP6: Variant X-154025791-T-G is Benign according to our data. Variant chrX-154025791-T-G is described in ClinVar as [Benign]. Clinvar id is 143271.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chrX-154025791-T-G is described in Lovd as [Benign].
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.072 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MECP2	NM_001110792.2	c.*4576A>C		3_prime_UTR_variant	3/3	ENST00000453960.7
MECP2	NM_004992.4	c.*4576A>C		3_prime_UTR_variant	4/4	ENST00000303391.11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MECP2	ENST00000303391.11	c.*4576A>C		3_prime_UTR_variant	4/4	1	NM_004992.4	P1
MECP2	ENST00000453960.7	c.*4576A>C		3_prime_UTR_variant	3/3	1	NM_001110792.2

Frequencies

GnomAD3 genomes AF: 0.0219 AC: 2475 AN: 112906 Hom.: 72 Cov.: 24 AF XY: 0.0197 AC XY: 692 AN XY: 35058

Gnomad AFR AF: 0.0744

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00811

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.0102

Gnomad SAS AF: 0.000719

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00422

Gnomad NFE AF: 0.000225

Gnomad OTH AF: 0.0171

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 308 Hom.: 0 Cov.: 0 AF XY: 0.00 AC XY: 0 AN XY: 132

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome AF: 0.0220 AC: 2481 AN: 112960 Hom.: 72 Cov.: 24 AF XY: 0.0198 AC XY: 696 AN XY: 35122

Gnomad4 AFR AF: 0.0745

Gnomad4 AMR AF: 0.00810

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00994

Gnomad4 SAS AF: 0.000721

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000225

Gnomad4 OTH AF: 0.0169

Alfa AF: 0.0182 Hom.: 60

Bravo AF: 0.0260

ClinVar

Significance: Benign

Submissions summary: Benign:2

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Benign:1

Benign, no assertion criteria provided

curation

RettBASE

Mar 10, 2010

- -

Rett syndrome Benign:1

Benign, criteria provided, single submitter

curation

Centre for Population Genomics, CPG

Aug 14, 2023

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 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
BayesDel_noAF	Benign	-0.40
CADD	Benign	9.3
DANN	Benign	0.72

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

Publications

LitVar

Other links and lift over

dbSNP: rs3027920; hg19: chrX-153291242;