rs1557135259

Positions:

• chrX-154030619-AGGGGGGCTGGTGGGGTCCTCGGAGCTCTCGGGCTCAGGTGGAGGTGGGGGCAGG-A

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM1 PM2 PM4

The NM_001110792.2(MECP2):​c.1191_1244del​(p.Leu398_Pro415del) variant causes a inframe deletion change. The variant allele was found at a frequency of 0.00000111 in 900,611 control chromosomes in the GnomAD database, with no homozygous occurrence. There are no hemizygote samples in GnomAD. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. P397P) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 18)
  • Exomes 𝑓: 0.0000011 (0 hom. 0 hem.)
• Consequence: MECP2 NM_001110792.2 inframe_deletion
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.53

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_pathogenic. Variant got 6 ACMG points.

• PM1: In a hotspot region, there are 6 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 13 benign, 10 uncertain in NM_001110792.2
• PM2: Very rare variant in population databases, with high coverage
• PM4: Nonframeshift variant in NON repetitive region in NM_001110792.2.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MECP2	NM_001110792.2	c.1191_1244del	p.Leu398_Pro415del	inframe_deletion	3/3	ENST00000453960.7
MECP2	NM_004992.4	c.1155_1208del	p.Leu386_Pro403del	inframe_deletion	4/4	ENST00000303391.11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MECP2	ENST00000303391.11	c.1155_1208del	p.Leu386_Pro403del	inframe_deletion	4/4	1	NM_004992.4	P1
MECP2	ENST00000453960.7	c.1191_1244del	p.Leu398_Pro415del	inframe_deletion	3/3	1	NM_001110792.2
MECP2	ENST00000407218.5	c.*527_*580del		3_prime_UTR_variant	4/4	5
MECP2	ENST00000628176.2	c.*527_*580del		3_prime_UTR_variant	5/5	3

Frequencies

GnomAD3 genomes Cov.: 18

GnomAD3 exomes AF: 0.00000570 AC: 1 AN: 175319 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 63691

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.000136

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000111 AC: 1 AN: 900611 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 290651

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.0000788

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 18

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Rett syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Molecular Diagnostics Lab, Nemours Children's Health, Delaware

Jun 30, 2015

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Computational scores

Source: dbNSFP v4.3

Splicing

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

Publications

LitVar

Other links and lift over

dbSNP: rs1557135259; hg19: chrX-153296070;