X-77654205-C-G

Variant names:

• chrX-77654205-C-G
• rs111833322
• NM_000489.6:c.4215-5G>C

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Moderate BP6_Moderate

The NM_000489.6(ATRX):​c.4215-5G>C variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Likely benign (★).

• Frequency: Genomes: not found (cov: 23)
• Consequence: ATRX NM_000489.6 splice_region, intron
• Scores: Splicing: ADA: 0.000009717
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 1.06
• Publications: 0 publications found

Genes affected

ATRX (HGNC:886): (ATRX chromatin remodeler) The protein encoded by this gene contains an ATPase/helicase domain, and thus it belongs to the SWI/SNF family of chromatin remodeling proteins. This protein is found to undergo cell cycle-dependent phosphorylation, which regulates its nuclear matrix and chromatin association, and suggests its involvement in the gene regulation at interphase and chromosomal segregation in mitosis. Mutations in this gene are associated with X-linked syndromes exhibiting cognitive disabilities as well as alpha-thalassemia (ATRX) syndrome. These mutations have been shown to cause diverse changes in the pattern of DNA methylation, which may provide a link between chromatin remodeling, DNA methylation, and gene expression in developmental processes. Multiple alternatively spliced transcript variants encoding distinct isoforms have been reported. [provided by RefSeq, Jul 2017]

ATRX Gene-Disease associations (from GenCC):

• alpha thalassemia-X-linked intellectual disability syndrome

  Inheritance: XL Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, Labcorp Genetics (formerly Invitae), Orphanet, Ambry Genetics
• ATR-X-related syndrome

  Inheritance: XL Classification: DEFINITIVE Submitted by: ClinGen
• intellectual disability-hypotonic facies syndrome, X-linked, 1

  Inheritance: XL Classification: MODERATE Submitted by: Ambry Genetics

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.35).
• BP6: Variant X-77654205-C-G is Benign according to our data. Variant chrX-77654205-C-G is described in ClinVar as [Likely_benign]. Clinvar id is 1618985.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ATRX	NM_000489.6	c.4215-5G>C		splice_region_variant, intron_variant	Intron 13 of 34	ENST00000373344.11	NP_000480.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ATRX	ENST00000373344.11	c.4215-5G>C		splice_region_variant, intron_variant	Intron 13 of 34	1	NM_000489.6	ENSP00000362441.4
ATRX	ENST00000395603.7	c.4101-5G>C		splice_region_variant, intron_variant	Intron 12 of 33	1		ENSP00000378967.3
ATRX	ENST00000624166.3	c.4011-5G>C		splice_region_variant, intron_variant	Intron 13 of 13	1		ENSP00000485103.1
ATRX	ENST00000480283.5	n.*3843-5G>C		splice_region_variant, intron_variant	Intron 14 of 35	1		ENSP00000480196.1

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Cov.: 26

GnomAD4 genome Cov.: 23

Alfa AF: 0.00 Hom.: 1

Bravo AF: 0.00000378

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

Alpha thalassemia-X-linked intellectual disability syndrome Benign:1

Oct 03, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.35
CADD	Benign	6.0
DANN	Benign	0.80
PhyloP100		1.1

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.0000097
dbscSNV1_RF	Benign	0.0
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

Other links and lift over

dbSNP: rs111833322; hg19: chrX-76909695;