7-94528227-CAG-GAA

Variant names:

• chr7-94528227-CAG-GAA
• NM_022900.5:c.436_438delCAGinsGAA
• CASD1 p.Gln146Glu

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 0P and 0B.

The NM_022900.5(CASD1):​c.436_438delCAGinsGAA​(p.Gln146Glu) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. It is difficult to determine the true allele frequency of this variant because it is of type MNV, and the frequency of such variant types in population databases may be underestimated and unreliable. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another nucleotide change resulting in the same amino acid substitution has been previously reported as Uncertain significance in ClinVar.

• Frequency: Genomes: not found (cov: 32)
• Consequence: CASD1 NM_022900.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 6.45
• Publications: 0 publications found

Genes affected

CASD1 (HGNC:16014): (CAS1 domain containing 1) Enables N-acetylneuraminate 7-O(or 9-O)-acetyltransferase activity. Involved in carbohydrate metabolic process. Is integral component of Golgi membrane. [provided by Alliance of Genome Resources, Apr 2022]

SGCE (HGNC:10808): (sarcoglycan epsilon) This gene encodes the epsilon member of the sarcoglycan family. Sarcoglycans are transmembrane proteins that are components of the dystrophin-glycoprotein complex, which link the actin cytoskeleton to the extracellular matrix. Unlike other family members which are predominantly expressed in striated muscle, the epsilon sarcoglycan is more broadly expressed. Mutations in this gene are associated with myoclonus-dystonia syndrome. This gene is imprinted, with preferential expression from the paternal allele. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. A pseudogene associated with this gene is located on chromosome 2. [provided by RefSeq, Oct 2016]

SGCE Gene-Disease associations (from GenCC):

• myoclonic dystonia 11

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, Genomics England PanelApp, Labcorp Genetics (formerly Invitae), PanelApp Australia, Illumina
• myoclonus-dystonia syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ENSG00000309657 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_022900.5. 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
	CASD1	NM_022900.5	MANE Select	c.436_438delCAGinsGAA	p.Gln146Glu	missense	N/A	NP_075051.4
	CASD1	NM_001363426.1		c.7_9delCAGinsGAA	p.Gln3Glu	missense	N/A	NP_001350355.1
	CASD1	NM_001363428.1		c.-136_-134delCAGinsGAA		5_prime_UTR	Exon 5 of 18	NP_001350357.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CASD1	ENST00000297273.9	TSL:1 MANE Select	c.436_438delCAGinsGAA	p.Gln146Glu	missense	N/A	ENSP00000297273.4	Q96PB1
	CASD1	ENST00000919855.1		c.436_438delCAGinsGAA	p.Gln146Glu	missense	N/A	ENSP00000589914.1
	CASD1	ENST00000919856.1		c.436_438delCAGinsGAA	p.Gln146Glu	missense	N/A	ENSP00000589915.1

Frequencies

GnomAD3 genomes Cov.: 32

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		6.5

Splicing

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

hg19: chr7-94157539;