Genetic Variant BSCL2:p.Pro258Arg (chr11-62692466-G-C) – ACMG Classification: Likely_pathogenic (6 pts)

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PM2PP3_Strong

The NM_001122955.4(BSCL2):c.773C>G(p.Pro258Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P258L) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 32)

Consequence

BSCL2
NM_001122955.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 8.36

Publications

0 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:

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ACMG classification

Classification was made for transcript

Our verdict: Likely_pathogenic. The variant received 6 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.98

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
BSCL2	NM_001122955.4 link	c.773C>G	p.Pro258Arg	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.773C>G	p.Pro258Arg	missense_variant	Exon 6 of 11	1	NM_001122955.4	ENSP00000354032.5
HNRNPUL2-BSCL2	ENST00000403734.2 link	n.*824C>G		non_coding_transcript_exon_variant	Exon 19 of 24	2		ENSP00000456010.1
HNRNPUL2-BSCL2	ENST00000403734.2 link	n.*824C>G		3_prime_UTR_variant	Exon 19 of 24	2		ENSP00000456010.1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

Cov.:

GnomAD4 genome

Cov.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not provided

Uncertain:1

Mar 30, 2022

GeneDx

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.83

BayesDel_addAF

Pathogenic

0.46

BayesDel_noAF

Pathogenic

0.42

CADD

Uncertain

(source)

DANN

Uncertain

1.0

DEOGEN2

Pathogenic

0.82

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

Eigen

Pathogenic

0.76

Eigen_PC

Pathogenic

0.67

FATHMM_MKL

Pathogenic

1.0

LIST_S2

Uncertain

0.93

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

M_CAP

Uncertain

0.20

MetaRNN

Pathogenic

0.98

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

MetaSVM

Pathogenic

0.82

MutationAssessor

Uncertain

2.6

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

PhyloP100

8.4

PrimateAI

Uncertain

0.67

PROVEAN

Pathogenic

-8.6

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

REVEL

Pathogenic

0.88

Sift

Uncertain

0.0010

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

Sift4G

Uncertain

0.0030

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

Polyphen

1.0

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

Vest4

0.96

MutPred

0.85

.;Gain of catalytic residue at P194 (P = 0.0186);.;.;Gain of catalytic residue at P194 (P = 0.0186);Gain of catalytic residue at P194 (P = 0.0186);Gain of catalytic residue at P194 (P = 0.0186);Gain of catalytic residue at P194 (P = 0.0186);

MVP

0.97

ClinPred

0.99

GERP RS

5.5

PromoterAI

-0.046

Neutral

(source)

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.68

gMVP

0.95

Mutation Taster

=40/60

disease causing

(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

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over