chrX-154026489-C-G

Position:

• chrX-154026489-C-G

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BS1 BS2

The NM_001110792.2(MECP2):​c.*3878G>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 0.00665 in 112,864 control chromosomes in the GnomAD database, including 3 homozygotes. There are 236 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0066 (3 hom., 236 hem., cov: 23)
  • 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, multiple submitters, no conflicts B:3
• Conservation: PhyloP100: 0.730

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 -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.87).
• BP6: Variant X-154026489-C-G is Benign according to our data. Variant chrX-154026489-C-G is described in ClinVar as [Benign]. Clinvar id is 143268.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chrX-154026489-C-G is described in Lovd as [Benign].
• BS1: Variant frequency is greater than expected in population nfe. gnomad4 allele frequency = 0.00665 (750/112864) while in subpopulation NFE AF= 0.0097 (517/53326). AF 95% confidence interval is 0.009. There are 3 homozygotes in gnomad4. There are 236 alleles in male gnomad4 subpopulation. Median coverage is 23. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd4 at 3 XL gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MECP2	NM_001110792.2	c.*3878G>C		3_prime_UTR_variant	3/3	ENST00000453960.7	NP_001104262.1
MECP2	NM_004992.4	c.*3878G>C		3_prime_UTR_variant	4/4	ENST00000303391.11	NP_004983.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MECP2	ENST00000303391.11	c.*3878G>C		3_prime_UTR_variant	4/4	1	NM_004992.4	ENSP00000301948	P1
MECP2	ENST00000453960.7	c.*3878G>C		3_prime_UTR_variant	3/3	1	NM_001110792.2	ENSP00000395535

Frequencies

GnomAD3 genomes AF: 0.00667 AC: 752 AN: 112810 Hom.: 3 Cov.: 23 AF XY: 0.00676 AC XY: 236 AN XY: 34934

Gnomad AFR AF: 0.00126

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00776

Gnomad ASJ AF: 0.0335

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00108

Gnomad FIN AF: 0.00128

Gnomad MID AF: 0.00837

Gnomad NFE AF: 0.00971

Gnomad OTH AF: 0.00658

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 312 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: 0.00665 AC: 750 AN: 112864 Hom.: 3 Cov.: 23 AF XY: 0.00674 AC XY: 236 AN XY: 34998

Gnomad4 AFR AF: 0.00125

Gnomad4 AMR AF: 0.00775

Gnomad4 ASJ AF: 0.0335

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00108

Gnomad4 FIN AF: 0.00128

Gnomad4 NFE AF: 0.00970

Gnomad4 OTH AF: 0.00650

Alfa AF: 0.00659 Hom.: 36

Bravo AF: 0.00669

ClinVar

Significance: Benign

Submissions summary: Benign:3

Revision: criteria provided, multiple submitters, no conflicts

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 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). -

not provided Benign:1

Benign, criteria provided, single submitter

not provided

Breakthrough Genomics, Breakthrough Genomics

-

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.87
CADD	Benign	5.1
DANN	Benign	0.60

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: rs148230889; hg19: chrX-153291940;