rs185341934

Variant names:

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 1P and 13B. PP3BP4_StrongBP6BS1BS2

The NM_001122955.4(BSCL2):c.845C>T(p.Ala282Val) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000595 in 1,614,176 control chromosomes in the GnomAD database, including 11 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A282T) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.0011 ( 4 hom., cov: 32)

Exomes 𝑓: 0.00054 ( 7 hom. )

Consequence

BSCL2
NM_001122955.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications B:12O:1

Conservation

PhyloP100: 8.36

Publications

6 publications found

Variant links:

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]

BSCL2 links:

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]

HNRNPUL2-BSCL2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -12 ACMG points.

PP3

Multiple lines of computational evidence support a deleterious effect 8: AlphaMissense, Cadd, Dann, Eigen, MutationAssessor, phyloP100way_vertebrate, REVEL, REVEL [when BayesDel_addAF, max_spliceai, FATHMM_MKL, MetaRNN, MutationTaster was below the threshold]

BP4

Computational evidence support a benign effect (MetaRNN=0.01549226).

BP6

Variant 11-62692394-G-A is Benign according to our data. Variant chr11-62692394-G-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 305177.

BS1

Variant frequency is greater than expected in population eas. GnomAd4 allele frequency = 0.00111 (169/152316) while in subpopulation EAS AF = 0.00869 (45/5180). AF 95% confidence interval is 0.00667. There are 4 homozygotes in GnomAd4. There are 86 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High Homozygotes in GnomAd4 at 4 AD,AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
BSCL2	NM_001122955.4 link	c.845C>T	p.Ala282Val	missense_variant	Exon 6 of 11	ENST00000360796.10	NP_001116427.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein
BSCL2	ENST00000360796.10 link	c.845C>T	p.Ala282Val	missense_variant	Exon 6 of 11	1	NM_001122955.4	ENSP00000354032.5
HNRNPUL2-BSCL2	ENST00000403734.2 link	n.*896C>T		non_coding_transcript_exon_variant	Exon 19 of 24	2		ENSP00000456010.1
HNRNPUL2-BSCL2	ENST00000403734.2 link	n.*896C>T		3_prime_UTR_variant	Exon 19 of 24	2		ENSP00000456010.1

Frequencies

GnomAD3 genomes

AF:

0.00110

AC:

168

AN:

152198

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000314

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00674

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00867

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00287

GnomAD2 exomes

AF:

0.00181

AC:

455

AN:

251320

AF XY:

0.00135

show subpopulations

Gnomad AFR exome

AF:

0.000123

Gnomad AMR exome

AF:

0.00905

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00652

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000440

Gnomad OTH exome

AF:

0.00147

GnomAD4 exome

AF:

0.000542

AC:

792

AN:

1461860

Hom.:

Cov.:

AF XY:

0.000477

AC XY:

347

AN XY:

727232

show subpopulations

African (AFR)

AF:

0.000149

AC:

AN:

33480

American (AMR)

AF:

0.00948

AC:

424

AN:

44722

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00617

AC:

245

AN:

39696

South Asian (SAS)

AF:

0.000220

AC:

AN:

86256

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53398

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.0000216

AC:

AN:

1112008

Other (OTH)

AF:

0.00124

AC:

AN:

60396

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.477

Heterozygous variant carriers

107

161

214

268

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

100

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.00111

AC:

169

AN:

152316

Hom.:

Cov.:

AF XY:

0.00115

AC XY:

AN XY:

74482

show subpopulations

African (AFR)

AF:

0.000313

AC:

AN:

41570

American (AMR)

AF:

0.00680

AC:

104

AN:

15300

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00869

AC:

AN:

5180

South Asian (SAS)

AF:

0.00

AC:

AN:

4826

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10618

Middle Eastern (MID)

AF:

0.00

AC:

AN:

292

European-Non Finnish (NFE)

AF:

0.0000147

AC:

AN:

68030

Other (OTH)

AF:

0.00284

AC:

AN:

2116

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.495

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.000480

Hom.:

Bravo

AF:

0.00207

ExAC

AF:

0.00165

AC:

200

Asia WGS

AF:

0.00318

AC:

AN:

3478

EpiCase

AF:

0.000109

EpiControl

AF:

0.000119

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Benign:12Other:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Benign:5

Breakthrough Genomics, Breakthrough Genomics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:not provided

Jun 22, 2022

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Sep 06, 2017

Center for Pediatric Genomic Medicine, Children's Mercy Hospital and Clinics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Mar 03, 2015

GeneDx

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Apr 01, 2025

CeGaT Center for Human Genetics Tuebingen

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

BSCL2: BS2

Congenital generalized lipodystrophy type 2

Benign:1Other:1

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease.

Clinical Genomics, Uppaluri K&H Personalized Medicine Clinic

Significance:Uncertain risk allele

Review Status:criteria provided, single submitter

Collection Method:research

Potent mutations in BSCL2 gene are associated with Congenital generalized lipodystrophy, type 2, which can present with insulin resistance, fatty liver and diabetes.However, the role of this particular variant rs185341934 of Congenital Generalized Lipodystrophy type 2 remains uncertain

not specified

Benign:1

May 24, 2017

Athena Diagnostics

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Inborn genetic diseases

Benign:1

Apr 08, 2022

Ambry Genetics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity.

Charcot-Marie-Tooth disease type 2

Benign:1

Jan 23, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

BSCL2-related disorder

Benign:1

Jul 30, 2019

PreventionGenetics, part of Exact Sciences

Significance:Benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

This variant is classified as benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications).

Monogenic diabetes

Benign:1

Jan 02, 2017

Personalized Diabetes Medicine Program, University of Maryland School of Medicine

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:research

ACMG criteria: PP3 (9 predictors), BS2 (3 homozygotes in Latinos), BP6 (InVitae and Athena call it benign)=Likely benign

Neuronopathy, distal hereditary motor, type 5A

Benign:1

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.94

BayesDel_addAF

Benign

-0.13

BayesDel_noAF

Uncertain

0.050

CADD

Pathogenic

(source)

DANN

Pathogenic

1.0

DEOGEN2

Benign

0.0

.;.;.;D;D;D;D;.

Eigen

Pathogenic

0.74

Eigen_PC

Uncertain

0.65

LIST_S2

Pathogenic

0.98

D;D;D;D;.;.;D;D

MetaRNN

Benign

0.015

T;T;T;T;T;T;T;T

MetaSVM

Uncertain

0.73

MutationAssessor

Benign

0.0

.;M;.;.;M;M;M;.

PhyloP100

8.4

PrimateAI

Uncertain

0.71

PROVEAN

Uncertain

-4.0

D;D;D;D;D;D;D;D

Sift

Pathogenic

0.0

D;D;D;D;D;D;D;D

Sift4G

Pathogenic

0.0

D;D;D;D;D;D;D;.

Vest4

0.97

ClinPred

0.083

GERP RS

4.6

PromoterAI

-0.099

Neutral

(source)

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.74

gMVP

0.76

Mutation Taster

=80/20

polymorphism

(source)

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

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over