rs797045109

Positions:

• chr6-152442152-G-GCC

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_182961.4(SYNE1):​c.3930_3931insGG​(p.His1311fs) 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 Likely pathogenic (★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 33)
• Consequence: SYNE1 NM_182961.4 frameshift
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 0.768

Genes affected

SYNE1 (HGNC:17089): (spectrin repeat containing nuclear envelope protein 1) This gene encodes a spectrin repeat containing protein expressed in skeletal and smooth muscle, and peripheral blood lymphocytes, that localizes to the nuclear membrane. Mutations in this gene have been associated with autosomal recessive spinocerebellar ataxia 8, also referred to as autosomal recessive cerebellar ataxia type 1 or recessive ataxia of Beauce. Alternatively spliced transcript variants encoding different isoforms have been described. [provided by RefSeq, Jul 2008]

SYNE1 (HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 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 6-152442152-G-GCC is Pathogenic according to our data. Variant chr6-152442152-G-GCC is described in ClinVar as [Likely_pathogenic]. Clinvar id is 208616.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SYNE1	NM_182961.4	c.3930_3931insGG	p.His1311fs	frameshift_variant	31/146	ENST00000367255.10	NP_892006.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SYNE1	ENST00000367255.10	c.3930_3931insGG	p.His1311fs	frameshift_variant	31/146	1	NM_182961.4	ENSP00000356224.5

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Autosomal recessive ataxia, Beauce type Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Dec 30, 2014

The His1311ProfsX30 variant in SYNE1 has not been previously reported in individuals with cerebellar ataxia or in large population studies. This variant is predicted to cause a frameshift, which alters the protein’s amino acid sequence beginning at position 1311 and leads to a premature termination codon 30 amino acids downstream. This alteration is then predicted to lead to a truncated or absent protein. Complete loss of SYNE1 functional has been reported in several individuals with autosomal recessive cerebellar ataxia (Gros-Louis 2007, Noreau 2013, Izumi 2013) and SYNE1 loss-of-function variants are rare in control populations, consistent with a pathogenic role. A different loss of function variant in the same exon has been reported in a patient with cerebellar ataxia (Noreau 2013), suggesting that variants in this exon may have an impact on functionally important transcripts. In summary, although additional studies are required to fully establish its clinical significance, the His1311ProfsX30 variant is likely pathogenic for cerebellar ataxia in an autosomal recessive manner. -

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: rs797045109; hg19: chr6-152763287;