rs796053335

Variant names:

• chr9-128632280-G-GGCATGC
• rs796053335
• NM_001130438.3:c.6923_6928dupGCATGC

Variant summary

Our verdict is Pathogenic. The variant received 13 ACMG points: 13P and 0B. PM2 PM4 PP3 PP5_Very_Strong

The NM_001130438.3(SPTAN1):​c.6923_6928dupGCATGC​(p.Arg2308_Met2309dup) variant causes a disruptive inframe insertion change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Likely pathogenic (★★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: SPTAN1 NM_001130438.3 disruptive_inframe_insertion
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:6
• Conservation: PhyloP100: 9.59
• Publications: 1 publications found

Genes affected

SPTAN1 (HGNC:11273): (spectrin alpha, non-erythrocytic 1) Spectrins are a family of filamentous cytoskeletal proteins that function as essential scaffold proteins that stabilize the plasma membrane and organize intracellular organelles. Spectrins are composed of alpha and beta dimers that associate to form tetramers linked in a head-to-head arrangement. This gene encodes an alpha spectrin that is specifically expressed in nonerythrocytic cells. The encoded protein has been implicated in other cellular functions including DNA repair and cell cycle regulation. Mutations in this gene are the cause of early infantile epileptic encephalopathy-5. Alternate splicing results in multiple transcript variants.[provided by RefSeq, Sep 2010]

SPTAN1 Gene-Disease associations (from GenCC):

• developmental and epileptic encephalopathy, 5

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: PanelApp Australia, Labcorp Genetics (formerly Invitae), Laboratory for Molecular Medicine, G2P, Ambry Genetics
• genetic developmental and epileptic encephalopathy

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• neuronopathy, distal hereditary motor, autosomal dominant 11

  Inheritance: AD Classification: STRONG Submitted by: PanelApp Australia
• spastic paraplegia 91, autosomal dominant, with or without cerebellar ataxia

  Inheritance: AD Classification: STRONG Submitted by: PanelApp Australia
• infantile spasms

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• hereditary spastic paraplegia

  Inheritance: AR Classification: LIMITED Submitted by: PanelApp Australia

ACMG classification

Our verdict: Pathogenic. The variant received 13 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM4: Nonframeshift variant in NON repetitive region in NM_001130438.3.
• PP3: No computational evidence supports a deleterious effect, but strongly conserved according to phyloP
• PP5: Variant 9-128632280-G-GGCATGC is Pathogenic according to our data. Variant chr9-128632280-G-GGCATGC is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 207370.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001130438.3. 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
	SPTAN1	NM_001130438.3	MANE Select	c.6923_6928dupGCATGC	p.Arg2308_Met2309dup	disruptive_inframe_insertion	Exon 53 of 57	NP_001123910.1	Q13813-2
	SPTAN1	NM_001375318.1		c.7022_7027dupGCATGC	p.Arg2341_Met2342dup	disruptive_inframe_insertion	Exon 55 of 59	NP_001362247.1
	SPTAN1	NM_001375310.1		c.7010_7015dupGCATGC	p.Arg2337_Met2338dup	disruptive_inframe_insertion	Exon 54 of 58	NP_001362239.1	A0A994J6W3

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SPTAN1	ENST00000372739.7	TSL:1 MANE Select	c.6923_6928dupGCATGC	p.Arg2308_Met2309dup	disruptive_inframe_insertion	Exon 53 of 57	ENSP00000361824.4	Q13813-2
	SPTAN1	ENST00000372731.8	TSL:1	c.6908_6913dupGCATGC	p.Arg2303_Met2304dup	disruptive_inframe_insertion	Exon 52 of 56	ENSP00000361816.4	Q13813-1
	SPTAN1	ENST00000358161.9	TSL:1	c.6848_6853dupGCATGC	p.Arg2283_Met2284dup	disruptive_inframe_insertion	Exon 51 of 55	ENSP00000350882.6	Q13813-3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 33

ClinVar

ClinVar submissions

Significance: Pathogenic/Likely pathogenic

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
3	-	-	Developmental and epileptic encephalopathy, 5 (3)
2	-	-	not provided (2)
1	-	-	Epileptic encephalopathy (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		9.6
Mutation Taster		=15/85	disease causing (ClinVar)

Splicing

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

Other links and lift over

dbSNP: rs796053335; hg19: chr9-131394559;