22-38740321-C-A

Variant names:

• chr22-38740321-C-A
• NM_015374.3:c.1302G>T
• SUN2 p.Ser434Ser

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2 BP4_Strong BP7

The NM_015374.3(SUN2):​c.1302G>T​(p.Ser434Ser) variant causes a synonymous 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. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. S434S) has been classified as Benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: SUN2 NM_015374.3 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -4.59
• Publications: 0 publications found

Genes affected

SUN2 (HGNC:14210): (Sad1 and UNC84 domain containing 2) SUN1 (MIM 607723) and SUN2 are inner nuclear membrane (INM) proteins that play a major role in nuclear-cytoplasmic connection by formation of a 'bridge' across the nuclear envelope, known as the LINC complex, via interaction with the conserved luminal KASH domain of nesprins (e.g., SYNE1; MIM 608441) located in the outer nuclear membrane (ONM). The LINC complex provides a direct connection between the nuclear lamina and the cytoskeleton, which contributes to nuclear positioning and cellular rigidity (summary by Haque et al., 2010 [PubMed 19933576]).[supplied by OMIM, Nov 2010]

GTPBP1 (HGNC:4669): (GTP binding protein 1) This gene is upregulated by interferon-gamma and encodes a protein that is a member of the AGP11/GTPBP1 family of GTP-binding proteins. A structurally similar protein has been found in mouse, where disruption of the gene for that protein had no observable phenotype. [provided by RefSeq, Jul 2008]

GTPBP1 Gene-Disease associations (from GenCC):

• neurodevelopmental disorder with characteristic facial and ectodermal features and tetraparesis 1

  Inheritance: AR Classification: MODERATE Submitted by: G2P

ENSG00000225450 (HGNC:):

ACMG classification

Our verdict: Likely_benign. The variant received -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.73).
• BP7: Synonymous conserved (PhyloP=-4.59 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_015374.3. 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
	SUN2	NM_015374.3	MANE Select	c.1302G>T	p.Ser434Ser	synonymous	Exon 12 of 18	NP_056189.1	Q9UH99-1
	SUN2	NM_001394427.1		c.1395G>T	p.Ser465Ser	synonymous	Exon 13 of 19	NP_001381356.1
	SUN2	NM_001199579.2		c.1365G>T	p.Ser455Ser	synonymous	Exon 12 of 18	NP_001186508.1	Q9UH99-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SUN2	ENST00000689035.1	MANE Select	c.1302G>T	p.Ser434Ser	synonymous	Exon 12 of 18	ENSP00000508608.1	Q9UH99-1
	SUN2	ENST00000405018.5	TSL:1	c.1365G>T	p.Ser455Ser	synonymous	Exon 12 of 18	ENSP00000385616.1	Q9UH99-2
	SUN2	ENST00000405510.5	TSL:1	c.1302G>T	p.Ser434Ser	synonymous	Exon 13 of 19	ENSP00000385740.1	Q9UH99-1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1450462 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 720800

African (AFR) AF: 0.00 AC: 0 AN: 33264

American (AMR) AF: 0.00 AC: 0 AN: 43632

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25856

East Asian (EAS) AF: 0.00 AC: 0 AN: 39198

South Asian (SAS) AF: 0.00 AC: 0 AN: 84416

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 51436

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5230

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1107590

Other (OTH) AF: 0.00 AC: 0 AN: 59840

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.73
CADD	Benign	0.013
DANN	Benign	0.78
PhyloP100		-4.6
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1

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

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

Other links and lift over

hg19: chr22-39136326;