rs1554983076

Variant names:

• chr11-62691342-G-GC
• rs1554983076
• NM_001122955.4:c.942dupG

Variant summary

Our verdict is Pathogenic. The variant received 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_001122955.4(BSCL2):​c.942dupG​(p.Leu315AlafsTer23) 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 Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: BSCL2 NM_001122955.4 frameshift
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:2
• Conservation: PhyloP100: 0.266
• Publications: 1 publications found

Genes affected

BSCL2 (HGNC:15832): (BSCL2 lipid droplet biogenesis associated, seipin) This gene encodes the multi-pass transmembrane protein protein seipin. This protein localizes to the endoplasmic reticulum and may be important for lipid droplet morphology. Mutations in this gene have been associated with congenital generalized lipodystrophy type 2 or Berardinelli-Seip syndrome, a rare autosomal recessive disease characterized by a near absence of adipose tissue and severe insulin resistance. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. Naturally occurring read-through transcription occurs between this locus and the neighboring locus HNRNPUL2 (heterogeneous nuclear ribonucleoprotein U-like 2).[provided by RefSeq, Mar 2011]

HNRNPUL2-BSCL2 (HGNC:49189): (HNRNPUL2-BSCL2 readthrough (NMD candidate)) This locus represents naturally occurring read-through transcription between the neighboring HNRNPUL2 (heterogeneous nuclear ribonucleoprotein U-like 2) and BSCL2 (Berardinelli-Seip congenital lipodystrophy 2 (seipin)) genes on chromosome 11. The read-through transcript is a candidate for nonsense-mediated mRNA decay (NMD), and is unlikely to produce a protein product. [provided by RefSeq, Mar 2011]

ACMG classification

Our verdict: Pathogenic. The variant received 18 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 11-62691342-G-GC is Pathogenic according to our data. Variant chr11-62691342-G-GC is described in ClinVar as Pathogenic. ClinVar VariationId is 434545.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001122955.4. 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
	BSCL2	NM_001122955.4	MANE Select	c.942dupG	p.Leu315AlafsTer23	frameshift	Exon 7 of 11	NP_001116427.1	Q96G97-4
	BSCL2	NM_001386027.1		c.942dupG	p.Leu315AlafsTer23	frameshift	Exon 8 of 12	NP_001372956.1	J3KQ12
	BSCL2	NM_001386028.1		c.942dupG	p.Leu315AlafsTer23	frameshift	Exon 8 of 12	NP_001372957.1	Q96G97-4

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	BSCL2	ENST00000360796.10	TSL:1 MANE Select	c.942dupG	p.Leu315AlafsTer23	frameshift	Exon 7 of 11	ENSP00000354032.5	Q96G97-4
	BSCL2	ENST00000405837.5	TSL:1	c.942dupG	p.Leu315AlafsTer23	frameshift	Exon 8 of 12	ENSP00000385332.1	J3KQ12
	BSCL2	ENST00000407022.7	TSL:1	c.750dupG	p.Leu251AlafsTer23	frameshift	Exon 7 of 11	ENSP00000384080.3	Q96G97-2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
2	-	-	Congenital generalized lipodystrophy type 2 (2)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		0.27
Mutation Taster		=0/200	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.050		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: rs1554983076; hg19: chr11-62458814;