NM_015374.3:c.1779+7A>T

Variant names:

• chr22-38738866-T-A
• rs374667255
• NM_015374.3:c.1779+7A>T

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 2P and 6B. PM2 BP4_Strong BP6_Moderate

The NM_015374.3(SUN2):​c.1779+7A>T variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000237 in 1,600,084 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Likely benign (★).

• Frequency:
  • Genomes: 𝑓 0.000059 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000020 (0 hom.)
• Consequence: SUN2 NM_015374.3 splice_region, intron
• Scores: Splicing: ADA: 0.0003627
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: -0.177
• 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]

ENSG00000230149 (HGNC:):

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

ACMG classification

Our verdict: Likely_benign. The variant received -4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.8).
• BP6: Variant 22-38738866-T-A is Benign according to our data. Variant chr22-38738866-T-A is described in ClinVar as Likely_benign. ClinVar VariationId is 530846.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SUN2	NM_015374.3	c.1779+7A>T		splice_region_variant, intron_variant	Intron 15 of 17	ENST00000689035.1	NP_056189.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SUN2	ENST00000689035.1	c.1779+7A>T		splice_region_variant, intron_variant	Intron 15 of 17		NM_015374.3	ENSP00000508608.1

Frequencies

GnomAD3 genomes AF: 0.0000592 AC: 9 AN: 152070 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000132

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.0000206 AC: 5 AN: 242244 AF XY: 0.0000153

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000458

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000200 AC: 29 AN: 1447896 Hom.: 0 Cov.: 33 AF XY: 0.0000125 AC XY: 9 AN XY: 717994

African (AFR) AF: 0.00 AC: 0 AN: 33286

American (AMR) AF: 0.00 AC: 0 AN: 44052

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25356

East Asian (EAS) AF: 0.00 AC: 0 AN: 39442

South Asian (SAS) AF: 0.00 AC: 0 AN: 84854

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52800

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5702

European-Non Finnish (NFE) AF: 0.0000263 AC: 29 AN: 1102670

Other (OTH) AF: 0.00 AC: 0 AN: 59734

GnomAD4 genome AF: 0.0000591 AC: 9 AN: 152188 Hom.: 0 Cov.: 32 AF XY: 0.0000538 AC XY: 4 AN XY: 74398

African (AFR) AF: 0.00 AC: 0 AN: 41528

American (AMR) AF: 0.00 AC: 0 AN: 15302

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3470

East Asian (EAS) AF: 0.00 AC: 0 AN: 5172

South Asian (SAS) AF: 0.00 AC: 0 AN: 4814

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10606

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.000132 AC: 9 AN: 67982

Other (OTH) AF: 0.00 AC: 0 AN: 2108

Alfa AF: 0.0000455 Hom.: 0

Bravo AF: 0.0000416

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

Emery-Dreifuss muscular dystrophy Benign:1

Oct 14, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.80
CADD	Benign	7.0
DANN	Benign	0.86
PhyloP100		-0.18

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.00036
dbscSNV1_RF	Benign	0.12
SpliceAI score (max)		0.030		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: rs374667255; hg19: chr22-39134871;