rs138994150
Variant summary
Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PVS1_StrongPM2
The NM_006412.4(AGPAT2):c.646A>T(p.Lys216Ter) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00022 in 1,510,710 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).
Frequency
Genomes: 𝑓 0.00094 ( 0 hom., cov: 33)
Exomes 𝑓: 0.00014 ( 0 hom. )
Consequence
AGPAT2
NM_006412.4 stop_gained
NM_006412.4 stop_gained
Scores
3
2
2
Clinical Significance
Conservation
PhyloP100: 2.26
Genes affected
AGPAT2 (HGNC:325): (1-acylglycerol-3-phosphate O-acyltransferase 2) This gene encodes a member of the 1-acylglycerol-3-phosphate O-acyltransferase family. The protein is located within the endoplasmic reticulum membrane and converts lysophosphatidic acid to phosphatidic acid, the second step in de novo phospholipid biosynthesis. Mutations in this gene have been associated with congenital generalized lipodystrophy (CGL), or Berardinelli-Seip syndrome, a disease characterized by a near absence of adipose tissue and severe insulin resistance. Alternate transcriptional splice variants, encoding different isoforms, have been characterized. [provided by RefSeq, Jul 2008]
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ACMG classification
Classification made for transcript
Verdict is Likely_pathogenic. Variant got 6 ACMG points.
PVS1
?
Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most 50 bp of the penultimate exon, not predicted to undergo nonsense mediated mRNA decay. There are 5 pathogenic variants in the truncated region.
PM2
?
Very rare variant in population databases, with high coverage;
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
AGPAT2 | NM_006412.4 | c.646A>T | p.Lys216Ter | stop_gained | 5/6 | ENST00000371696.7 | |
AGPAT2 | NM_001012727.2 | c.550A>T | p.Lys184Ter | stop_gained | 4/5 | ||
AGPAT2 | XM_047422636.1 | c.337A>T | p.Lys113Ter | stop_gained | 5/6 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
AGPAT2 | ENST00000371696.7 | c.646A>T | p.Lys216Ter | stop_gained | 5/6 | 1 | NM_006412.4 | P1 | |
AGPAT2 | ENST00000371694.7 | c.550A>T | p.Lys184Ter | stop_gained | 4/5 | 1 | |||
AGPAT2 | ENST00000472820.1 | n.574A>T | non_coding_transcript_exon_variant | 3/4 | 1 |
Frequencies
GnomAD3 genomes ? AF: 0.000940 AC: 143AN: 152160Hom.: 0 Cov.: 33
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GnomAD3 exomes AF: 0.000396 AC: 71AN: 179484Hom.: 0 AF XY: 0.000339 AC XY: 33AN XY: 97348
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GnomAD4 exome AF: 0.000140 AC: 190AN: 1358432Hom.: 0 Cov.: 30 AF XY: 0.000142 AC XY: 95AN XY: 669302
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GnomAD4 genome ? AF: 0.000939 AC: 143AN: 152278Hom.: 0 Cov.: 33 AF XY: 0.000819 AC XY: 61AN XY: 74470
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ClinVar
Significance: Conflicting classifications of pathogenicity
Submissions summary: Pathogenic:3Uncertain:1Benign:1Other:1
Revision: criteria provided, conflicting classifications
LINK: link
Submissions by phenotype
Congenital generalized lipodystrophy type 1 Pathogenic:3Uncertain:1Other:1
Likely pathogenic, criteria provided, single submitter | clinical testing | Fulgent Genetics, Fulgent Genetics | Jun 30, 2021 | - - |
Uncertain significance, criteria provided, single submitter | clinical testing | Illumina Laboratory Services, Illumina | Apr 27, 2017 | The AGPAT2 c.646A>T (p.Lys216Ter) variant is a stop-gained variant that is predicted to cause premature truncation of the protein. This variant has been reported in two studies in which it is found in a total of two individuals with Berardinelli-Seip congenital lipodystrophy, both of whom were homozygous for the variant (Marge et al. 2003; Akinci et al. 2016). Control data are unavailable for this variant, which is reported at a frequency of 0.00454 in the African population of the 1000 Genomes Project. Due to the potential impact of stop-gained variants and the limited evidence, this variant is classified as a variant of unknown significance but suspicious for pathogenicity for Berardinelli-Seip congenital lipodystrophy. This variant was observed by ICSL as part of a predisposition screen in an ostensibly healthy population. - |
Likely pathogenic, criteria provided, single submitter | clinical testing | Neuberg Centre For Genomic Medicine, NCGM | Feb 14, 2023 | The stop gained c.646A>T(p.Lys216Ter) variant in AGPAT2 gene has been reported previously in homozygous state in individual(s) affected with Berardinelli-Seip congenital lipodystrophy (Akinci B, et. al.,2016; Magré J, et. al., 2003). The c.646A>T variant has been reported with allele frequency of 0.04% in gnomAD Exomes databases. This variant has been reported to the ClinVar database as Likely Benign/ Uncertain Significance / Likely Pathogenic / Pathogenic. This variant is predicted to cause loss of normal protein function through protein truncation. Loss of function variants have been previously reported to be disease causing. However, additional functional studies will be required to prove the pathogenicity of this variant. For these reasons, this variant has been classified as Likely Pathogenic. - |
not provided, no classification provided | literature only | GeneReviews | - | - - |
Pathogenic, criteria provided, single submitter | clinical testing | Mendelics | May 04, 2022 | - - |
not provided Benign:1
Likely benign, criteria provided, single submitter | clinical testing | Invitae | Oct 19, 2018 | - - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Pathogenic
Cadd
Pathogenic
Dann
Uncertain
Eigen
Uncertain
Eigen_PC
Benign
FATHMM_MKL
Pathogenic
D
MutationTaster
Benign
A;D;D
Vest4
GERP RS
Splicing
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SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at