1-235808915-CT-CTT

Variant names:

• chr1-235808915-C-CT
• rs80338646
• NM_000081.4:c.1902dupA

Variant summary

Our verdict is Pathogenic. The variant received 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_000081.4(LYST):​c.1902dupA​(p.Ala635SerfsTer4) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: LYST NM_000081.4 frameshift
• Clinical Significance: Pathogenic criteria provided, single submitter P:2 O:1
• Conservation: PhyloP100: -0.121
• Publications: 8 publications found

Genes affected

LYST (HGNC:1968): (lysosomal trafficking regulator) This gene encodes a protein that regulates intracellular protein trafficking in endosomes, and may be involved in pigmentation. Mutations in this gene are associated with Chediak-Higashi syndrome, a lysosomal storage disorder. Alternative splicing results in multiple transcript variants, though the full-length nature of some of these variants has not been determined. [provided by RefSeq, Apr 2013]

LYST Gene-Disease associations (from GenCC):

• Chediak-Higashi syndrome

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, Labcorp Genetics (formerly Invitae), Orphanet, ClinGen, Genomics England PanelApp
• attenuated Chédiak-Higashi syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Pathogenic. The variant received 12 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 1-235808915-C-CT is Pathogenic according to our data. Variant chr1-235808915-C-CT is described in ClinVar as Pathogenic. ClinVar VariationId is 3811.Status of the report is criteria_provided_single_submitter, 1 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000081.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	LYST	NM_000081.4	MANE Select	c.1902dupA	p.Ala635SerfsTer4	frameshift	Exon 5 of 53	NP_000072.2	Q99698-1
	LYST	NM_001301365.1		c.1902dupA	p.Ala635SerfsTer4	frameshift	Exon 5 of 53	NP_001288294.1	Q99698-1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	LYST	ENST00000389793.7	TSL:5 MANE Select	c.1902dupA	p.Ala635SerfsTer4	frameshift	Exon 5 of 53	ENSP00000374443.2	Q99698-1
	LYST	ENST00000465349.5	TSL:1	n.2453dupA		non_coding_transcript_exon	Exon 5 of 12
	LYST	ENST00000489585.5	TSL:1	n.1902dupA		non_coding_transcript_exon	Exon 5 of 23	ENSP00000513166.1	Q99698-2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 35

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
1	-	-	Chédiak-Higashi syndrome (2)
1	-	-	CHEDIAK-HIGASHI SYNDROME, CHILDHOOD TYPE (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		-0.12
Mutation Taster		=3/197	disease causing (ClinVar)

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

Other links and lift over

dbSNP: rs80338646; hg19: chr1-235972215;